ChatKit

Domain Types

ChatKit Workflow

ChatKitWorkflow object { id, state_variables, tracing, version }

Workflow metadata and state returned for the session.
- id: string
  
  Identifier of the workflow backing the session.
- state_variables: map[string or boolean or number]
  
  State variable key-value pairs applied when invoking the workflow. Defaults to null when no overrides were provided.
  - string
  - boolean
  - number
- tracing: object { enabled }
  
  Tracing settings applied to the workflow.
  - enabled: boolean
    
    Indicates whether tracing is enabled.
- version: string
  
  Specific workflow version used for the session. Defaults to null when using the latest deployment.

Sessions

Cancel chat session

post /chatkit/sessions/{session_id}/cancel

Cancel an active ChatKit session and return its most recent metadata.

Cancelling prevents new requests from using the issued client secret.

Path Parameters

session_id: string

Returns

ChatSession object { id, chatkit_configuration, client_secret, 7 more }

Represents a ChatKit session and its resolved configuration.
- id: string
  
  Identifier for the ChatKit session.
- chatkit_configuration: ChatSessionChatKitConfiguration
  
  Resolved ChatKit feature configuration for the session.
  - automatic_thread_titling: ChatSessionAutomaticThreadTitling
    
    Automatic thread titling preferences.
    - enabled: boolean
      
      Whether automatic thread titling is enabled.
  - file_upload: ChatSessionFileUpload
    
    Upload settings for the session.
    - enabled: boolean
      
      Indicates if uploads are enabled for the session.
    - max_file_size: number
      
      Maximum upload size in megabytes.
    - max_files: number
      
      Maximum number of uploads allowed during the session.
  - history: ChatSessionHistory
    
    History retention configuration.
    - enabled: boolean
      
      Indicates if chat history is persisted for the session.
    - recent_threads: number
      
      Number of prior threads surfaced in history views. Defaults to null when all history is retained.
- client_secret: string
  
  Ephemeral client secret that authenticates session requests.
- expires_at: number
  
  Unix timestamp (in seconds) for when the session expires.
- max_requests_per_1_minute: number
  
  Convenience copy of the per-minute request limit.
- object: "chatkit.session"
  
  Type discriminator that is always chatkit.session.
  - "chatkit.session"
- rate_limits: ChatSessionRateLimits
  
  Resolved rate limit values.
  - max_requests_per_1_minute: number
    
    Maximum allowed requests per one-minute window.
- status: ChatSessionStatus
  
  Current lifecycle state of the session.
  - "active"
  - "expired"
  - "cancelled"
- user: string
  
  User identifier associated with the session.
- workflow: ChatKitWorkflow
  
  Workflow metadata for the session.
  - id: string
    
    Identifier of the workflow backing the session.
  - state_variables: map[string or boolean or number]
    
    State variable key-value pairs applied when invoking the workflow. Defaults to null when no overrides were provided.
    - string
    - boolean
    - number
  - tracing: object { enabled }
    
    Tracing settings applied to the workflow.
    - enabled: boolean
      
      Indicates whether tracing is enabled.
  - version: string
    
    Specific workflow version used for the session. Defaults to null when using the latest deployment.

Example

curl https://api.openai.com/v1/chatkit/sessions/$SESSION_ID/cancel \
    -X POST \
    -H 'OpenAI-Beta: chatkit_beta=v1' \
    -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "id": "id",
  "chatkit_configuration": {
    "automatic_thread_titling": {
      "enabled": true
    },
    "file_upload": {
      "enabled": true,
      "max_file_size": 0,
      "max_files": 0
    },
    "history": {
      "enabled": true,
      "recent_threads": 0
    }
  },
  "client_secret": "client_secret",
  "expires_at": 0,
  "max_requests_per_1_minute": 0,
  "object": "chatkit.session",
  "rate_limits": {
    "max_requests_per_1_minute": 0
  },
  "status": "active",
  "user": "user",
  "workflow": {
    "id": "id",
    "state_variables": {
      "foo": "string"
    },
    "tracing": {
      "enabled": true
    },
    "version": "version"
  }
}

Example

curl -X POST \
  https://api.openai.com/v1/chatkit/sessions/cksess_123/cancel \
  -H "OpenAI-Beta: chatkit_beta=v1" \
  -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "id": "cksess_123",
  "object": "chatkit.session",
  "workflow": {
    "id": "workflow_alpha",
    "version": "1"
  },
  "scope": {
    "customer_id": "cust_456"
  },
  "max_requests_per_1_minute": 30,
  "ttl_seconds": 900,
  "status": "cancelled",
  "cancelled_at": 1712345678
}

Create ChatKit session

post /chatkit/sessions

Create a ChatKit session.

Body Parameters

user: string

A free-form string that identifies your end user; ensures this Session can access other objects that have the same user scope.
workflow: ChatSessionWorkflowParam

Workflow that powers the session.
- id: string
  
  Identifier for the workflow invoked by the session.
- state_variables: optional map[string or boolean or number]
  
  State variables forwarded to the workflow. Keys may be up to 64 characters, values must be primitive types, and the map defaults to an empty object.
  - string
  - boolean
  - number
- tracing: optional object { enabled }
  
  Optional tracing overrides for the workflow invocation. When omitted, tracing is enabled by default.
  - enabled: optional boolean
    
    Whether tracing is enabled during the session. Defaults to true.
- version: optional string
  
  Specific workflow version to run. Defaults to the latest deployed version.
chatkit_configuration: optional ChatSessionChatKitConfigurationParam

Optional overrides for ChatKit runtime configuration features
- automatic_thread_titling: optional object { enabled }
  
  Configuration for automatic thread titling. When omitted, automatic thread titling is enabled by default.
  - enabled: optional boolean
    
    Enable automatic thread title generation. Defaults to true.
- file_upload: optional object { enabled, max_file_size, max_files }
  
  Configuration for upload enablement and limits. When omitted, uploads are disabled by default (max_files 10, max_file_size 512 MB).
  - enabled: optional boolean
    
    Enable uploads for this session. Defaults to false.
  - max_file_size: optional number
    
    Maximum size in megabytes for each uploaded file. Defaults to 512 MB, which is the maximum allowable size.
  - max_files: optional number
    
    Maximum number of files that can be uploaded to the session. Defaults to 10.
- history: optional object { enabled, recent_threads }
  
  Configuration for chat history retention. When omitted, history is enabled by default with no limit on recent_threads (null).
  - enabled: optional boolean
    
    Enables chat users to access previous ChatKit threads. Defaults to true.
  - recent_threads: optional number
    
    Number of recent ChatKit threads users have access to. Defaults to unlimited when unset.
expires_after: optional ChatSessionExpiresAfterParam

Optional override for session expiration timing in seconds from creation. Defaults to 10 minutes.
- anchor: "created_at"
  
  Base timestamp used to calculate expiration. Currently fixed to created_at.
  - "created_at"
- seconds: number
  
  Number of seconds after the anchor when the session expires.
rate_limits: optional ChatSessionRateLimitsParam

Optional override for per-minute request limits. When omitted, defaults to 10.
- max_requests_per_1_minute: optional number
  
  Maximum number of requests allowed per minute for the session. Defaults to 10.

Returns

ChatSession object { id, chatkit_configuration, client_secret, 7 more }

Represents a ChatKit session and its resolved configuration.
- id: string
  
  Identifier for the ChatKit session.
- chatkit_configuration: ChatSessionChatKitConfiguration
  
  Resolved ChatKit feature configuration for the session.
  - automatic_thread_titling: ChatSessionAutomaticThreadTitling
    
    Automatic thread titling preferences.
    - enabled: boolean
      
      Whether automatic thread titling is enabled.
  - file_upload: ChatSessionFileUpload
    
    Upload settings for the session.
    - enabled: boolean
      
      Indicates if uploads are enabled for the session.
    - max_file_size: number
      
      Maximum upload size in megabytes.
    - max_files: number
      
      Maximum number of uploads allowed during the session.
  - history: ChatSessionHistory
    
    History retention configuration.
    - enabled: boolean
      
      Indicates if chat history is persisted for the session.
    - recent_threads: number
      
      Number of prior threads surfaced in history views. Defaults to null when all history is retained.
- client_secret: string
  
  Ephemeral client secret that authenticates session requests.
- expires_at: number
  
  Unix timestamp (in seconds) for when the session expires.
- max_requests_per_1_minute: number
  
  Convenience copy of the per-minute request limit.
- object: "chatkit.session"
  
  Type discriminator that is always chatkit.session.
  - "chatkit.session"
- rate_limits: ChatSessionRateLimits
  
  Resolved rate limit values.
  - max_requests_per_1_minute: number
    
    Maximum allowed requests per one-minute window.
- status: ChatSessionStatus
  
  Current lifecycle state of the session.
  - "active"
  - "expired"
  - "cancelled"
- user: string
  
  User identifier associated with the session.
- workflow: ChatKitWorkflow
  
  Workflow metadata for the session.
  - id: string
    
    Identifier of the workflow backing the session.
  - state_variables: map[string or boolean or number]
    
    State variable key-value pairs applied when invoking the workflow. Defaults to null when no overrides were provided.
    - string
    - boolean
    - number
  - tracing: object { enabled }
    
    Tracing settings applied to the workflow.
    - enabled: boolean
      
      Indicates whether tracing is enabled.
  - version: string
    
    Specific workflow version used for the session. Defaults to null when using the latest deployment.

Example

curl https://api.openai.com/v1/chatkit/sessions \
    -H 'Content-Type: application/json' \
    -H 'OpenAI-Beta: chatkit_beta=v1' \
    -H "Authorization: Bearer $OPENAI_API_KEY" \
    -d '{
          "user": "x",
          "workflow": {
            "id": "id"
          }
        }'

Response

{
  "id": "id",
  "chatkit_configuration": {
    "automatic_thread_titling": {
      "enabled": true
    },
    "file_upload": {
      "enabled": true,
      "max_file_size": 0,
      "max_files": 0
    },
    "history": {
      "enabled": true,
      "recent_threads": 0
    }
  },
  "client_secret": "client_secret",
  "expires_at": 0,
  "max_requests_per_1_minute": 0,
  "object": "chatkit.session",
  "rate_limits": {
    "max_requests_per_1_minute": 0
  },
  "status": "active",
  "user": "user",
  "workflow": {
    "id": "id",
    "state_variables": {
      "foo": "string"
    },
    "tracing": {
      "enabled": true
    },
    "version": "version"
  }
}

Example

curl https://api.openai.com/v1/chatkit/sessions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "OpenAI-Beta: chatkit_beta=v1" \
  -d '{
    "workflow": {
      "id": "workflow_alpha",
      "version": "2024-10-01"
    },
    "scope": {
      "project": "alpha",
      "environment": "staging"
    },
    "expires_after": 1800,
    "max_requests_per_1_minute": 60,
    "max_requests_per_session": 500
  }'

Response

{
  "client_secret": "chatkit_token_123",
  "expires_at": 1735689600,
  "workflow": {
    "id": "workflow_alpha",
    "version": "2024-10-01"
  },
  "scope": {
    "project": "alpha",
    "environment": "staging"
  },
  "max_requests_per_1_minute": 60,
  "max_requests_per_session": 500,
  "status": "active"
}

Threads

List ChatKit thread items

get /chatkit/threads/{thread_id}/items

List items that belong to a ChatKit thread.

Path Parameters

thread_id: string

Query Parameters

after: optional string

List items created after this thread item ID. Defaults to null for the first page.
before: optional string

List items created before this thread item ID. Defaults to null for the newest results.
limit: optional number

Maximum number of thread items to return. Defaults to 20.
order: optional "asc" or "desc"

Sort order for results by creation time. Defaults to desc.
- "asc"
- "desc"

Returns

ChatKitThreadItemList object { data, first_id, has_more, 2 more }

A paginated list of thread items rendered for the ChatKit API.
- data: array of ChatKitThreadUserMessageItem or ChatKitThreadAssistantMessageItem or ChatKitWidgetItem or 3 more
  
  A list of items
  - ChatKitThreadUserMessageItem object { id, attachments, content, 5 more }
    
    User-authored messages within a thread.
    - id: string
      
      Identifier of the thread item.
    - attachments: array of ChatKitAttachment
      
      Attachments associated with the user message. Defaults to an empty list.
      - id: string
        
        Identifier for the attachment.
      - mime_type: string
        
        MIME type of the attachment.
      - name: string
        
        Original display name for the attachment.
      - preview_url: string
        
        Preview URL for rendering the attachment inline.
      - type: "image" or "file"
        
        Attachment discriminator.
        
        "image"
        
        "file"
    - content: array of object { text, type } or object { text, type }
      
      Ordered content elements supplied by the user.
      - InputText object { text, type }
        
        Text block that a user contributed to the thread.
        
        text: string
        
        Plain-text content supplied by the user.
        
        type: "input_text"
        
        Type discriminator that is always input_text.
        
        "input_text"
      - QuotedText object { text, type }
        
        Quoted snippet that the user referenced in their message.
        
        text: string
        
        Quoted text content.
        
        type: "quoted_text"
        
        Type discriminator that is always quoted_text.
        
        "quoted_text"
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - inference_options: object { model, tool_choice }
      
      Inference overrides applied to the message. Defaults to null when unset.
      - model: string
        
        Model name that generated the response. Defaults to null when using the session default.
      - tool_choice: object { id }
        
        Preferred tool to invoke. Defaults to null when ChatKit should auto-select.
        
        id: string
        
        Identifier of the requested tool.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.user_message"
      - "chatkit.user_message"
  - ChatKitThreadAssistantMessageItem object { id, content, created_at, 3 more }
    
    Assistant-authored message within a thread.
    - id: string
      
      Identifier of the thread item.
    - content: array of ChatKitResponseOutputText
      
      Ordered assistant response segments.
      - annotations: array of object { source, type } or object { source, type }
        
        Ordered list of annotations attached to the response text.
        
        File object { source, type }
        
        Annotation that references an uploaded file.
        
        source: object { filename, type }
        
        File attachment referenced by the annotation.
        
        filename: string
        
        Filename referenced by the annotation.
        
        type: "file"
        
        Type discriminator that is always file.
        
        "file"
        
        type: "file"
        
        Type discriminator that is always file for this annotation.
        
        "file"
        
        URL object { source, type }
        
        Annotation that references a URL.
        
        source: object { type, url }
        
        URL referenced by the annotation.
        
        type: "url"
        
        Type discriminator that is always url.
        
        "url"
        
        url: string
        
        URL referenced by the annotation.
        
        type: "url"
        
        Type discriminator that is always url for this annotation.
        
        "url"
      - text: string
        
        Assistant generated text.
      - type: "output_text"
        
        Type discriminator that is always output_text.
        
        "output_text"
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.assistant_message"
      
      Type discriminator that is always chatkit.assistant_message.
      - "chatkit.assistant_message"
  - ChatKitWidgetItem object { id, created_at, object, 3 more }
    
    Thread item that renders a widget payload.
    - id: string
      
      Identifier of the thread item.
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.widget"
      
      Type discriminator that is always chatkit.widget.
      - "chatkit.widget"
    - widget: string
      
      Serialized widget payload rendered in the UI.
  - ChatKitClientToolCall object { id, arguments, call_id, 7 more }
    
    Record of a client side tool invocation initiated by the assistant.
    - id: string
      
      Identifier of the thread item.
    - arguments: string
      
      JSON-encoded arguments that were sent to the tool.
    - call_id: string
      
      Identifier for the client tool call.
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - name: string
      
      Tool name that was invoked.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - output: string
      
      JSON-encoded output captured from the tool. Defaults to null while execution is in progress.
    - status: "in_progress" or "completed"
      
      Execution status for the tool call.
      - "in_progress"
      - "completed"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.client_tool_call"
      
      Type discriminator that is always chatkit.client_tool_call.
      - "chatkit.client_tool_call"
  - ChatKitTask object { id, created_at, heading, 5 more }
    
    Task emitted by the workflow to show progress and status updates.
    - id: string
      
      Identifier of the thread item.
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - heading: string
      
      Optional heading for the task. Defaults to null when not provided.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - summary: string
      
      Optional summary that describes the task. Defaults to null when omitted.
    - task_type: "custom" or "thought"
      
      Subtype for the task.
      - "custom"
      - "thought"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.task"
      
      Type discriminator that is always chatkit.task.
      - "chatkit.task"
  - ChatKitTaskGroup object { id, created_at, object, 3 more }
    
    Collection of workflow tasks grouped together in the thread.
    - id: string
      
      Identifier of the thread item.
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - tasks: array of object { heading, summary, type }
      
      Tasks included in the group.
      - heading: string
        
        Optional heading for the grouped task. Defaults to null when not provided.
      - summary: string
        
        Optional summary that describes the grouped task. Defaults to null when omitted.
      - type: "custom" or "thought"
        
        Subtype for the grouped task.
        
        "custom"
        
        "thought"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.task_group"
      
      Type discriminator that is always chatkit.task_group.
      - "chatkit.task_group"
- first_id: string
  
  The ID of the first item in the list.
- has_more: boolean
  
  Whether there are more items available.
- last_id: string
  
  The ID of the last item in the list.
- object: "list"
  
  The type of object returned, must be list.
  - "list"

Example

curl https://api.openai.com/v1/chatkit/threads/$THREAD_ID/items \
    -H 'OpenAI-Beta: chatkit_beta=v1' \
    -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "data": [
    {
      "id": "id",
      "attachments": [
        {
          "id": "id",
          "mime_type": "mime_type",
          "name": "name",
          "preview_url": "https://example.com",
          "type": "image"
        }
      ],
      "content": [
        {
          "text": "text",
          "type": "input_text"
        }
      ],
      "created_at": 0,
      "inference_options": {
        "model": "model",
        "tool_choice": {
          "id": "id"
        }
      },
      "object": "chatkit.thread_item",
      "thread_id": "thread_id",
      "type": "chatkit.user_message"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id",
  "object": "list"
}

Example

curl "https://api.openai.com/v1/chatkit/threads/cthr_abc123/items?limit=3" \
  -H "OpenAI-Beta: chatkit_beta=v1" \
  -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "data": [
    {
      "id": "cthi_user_001",
      "object": "chatkit.thread_item",
      "type": "user_message",
      "content": [
        {
          "type": "input_text",
          "text": "I need help debugging an onboarding issue."
        }
      ],
      "attachments": []
    },
    {
      "id": "cthi_assistant_002",
      "object": "chatkit.thread_item",
      "type": "assistant_message",
      "content": [
        {
          "type": "output_text",
          "text": "Let's start by confirming the workflow version you deployed."
        }
      ]
    }
  ],
  "has_more": false,
  "object": "list"
}

Retrieve ChatKit thread

get /chatkit/threads/{thread_id}

Retrieve a ChatKit thread by its identifier.

Path Parameters

thread_id: string

Returns

ChatKitThread object { id, created_at, object, 3 more }

Represents a ChatKit thread and its current status.
- id: string
  
  Identifier of the thread.
- created_at: number
  
  Unix timestamp (in seconds) for when the thread was created.
- object: "chatkit.thread"
  
  Type discriminator that is always chatkit.thread.
  - "chatkit.thread"
- status: object { type } or object { reason, type } or object { reason, type }
  
  Current status for the thread. Defaults to active for newly created threads.
  - Active object { type }
    
    Indicates that a thread is active.
    - type: "active"
      
      Status discriminator that is always active.
      - "active"
  - Locked object { reason, type }
    
    Indicates that a thread is locked and cannot accept new input.
    - reason: string
      
      Reason that the thread was locked. Defaults to null when no reason is recorded.
    - type: "locked"
      
      Status discriminator that is always locked.
      - "locked"
  - Closed object { reason, type }
    
    Indicates that a thread has been closed.
    - reason: string
      
      Reason that the thread was closed. Defaults to null when no reason is recorded.
    - type: "closed"
      
      Status discriminator that is always closed.
      - "closed"
- title: string
  
  Optional human-readable title for the thread. Defaults to null when no title has been generated.
- user: string
  
  Free-form string that identifies your end user who owns the thread.

Example

curl https://api.openai.com/v1/chatkit/threads/$THREAD_ID \
    -H 'OpenAI-Beta: chatkit_beta=v1' \
    -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "id": "cthr_def456",
  "created_at": 1712345600,
  "object": "chatkit.thread",
  "status": {
    "type": "active"
  },
  "title": "Demo feedback",
  "user": "user_456"
}

Example

curl https://api.openai.com/v1/chatkit/threads/cthr_abc123 \
  -H "OpenAI-Beta: chatkit_beta=v1" \
  -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "id": "cthr_abc123",
  "object": "chatkit.thread",
  "title": "Customer escalation",
  "items": {
    "data": [
      {
        "id": "cthi_user_001",
        "object": "chatkit.thread_item",
        "type": "user_message",
        "content": [
          {
            "type": "input_text",
            "text": "I need help debugging an onboarding issue."
          }
        ],
        "attachments": []
      },
      {
        "id": "cthi_assistant_002",
        "object": "chatkit.thread_item",
        "type": "assistant_message",
        "content": [
          {
            "type": "output_text",
            "text": "Let's start by confirming the workflow version you deployed."
          }
        ]
      }
    ],
    "has_more": false
  }
}

Delete ChatKit thread

delete /chatkit/threads/{thread_id}

Delete a ChatKit thread along with its items and stored attachments.

Path Parameters

thread_id: string

Returns

id: string

Identifier of the deleted thread.
deleted: boolean

Indicates that the thread has been deleted.
object: "chatkit.thread.deleted"

Type discriminator that is always chatkit.thread.deleted.
- "chatkit.thread.deleted"

Example

curl https://api.openai.com/v1/chatkit/threads/$THREAD_ID \
    -X DELETE \
    -H 'OpenAI-Beta: chatkit_beta=v1' \
    -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "id": "id",
  "deleted": true,
  "object": "chatkit.thread.deleted"
}

List ChatKit threads

get /chatkit/threads

List ChatKit threads with optional pagination and user filters.

Query Parameters

after: optional string

List items created after this thread item ID. Defaults to null for the first page.
before: optional string

List items created before this thread item ID. Defaults to null for the newest results.
limit: optional number

Maximum number of thread items to return. Defaults to 20.
order: optional "asc" or "desc"

Sort order for results by creation time. Defaults to desc.
- "asc"
- "desc"
user: optional string

Filter threads that belong to this user identifier. Defaults to null to return all users.

Returns

data: array of ChatKitThread

A list of items
- id: string
  
  Identifier of the thread.
- created_at: number
  
  Unix timestamp (in seconds) for when the thread was created.
- object: "chatkit.thread"
  
  Type discriminator that is always chatkit.thread.
  - "chatkit.thread"
- status: object { type } or object { reason, type } or object { reason, type }
  
  Current status for the thread. Defaults to active for newly created threads.
  - Active object { type }
    
    Indicates that a thread is active.
    - type: "active"
      
      Status discriminator that is always active.
      - "active"
  - Locked object { reason, type }
    
    Indicates that a thread is locked and cannot accept new input.
    - reason: string
      
      Reason that the thread was locked. Defaults to null when no reason is recorded.
    - type: "locked"
      
      Status discriminator that is always locked.
      - "locked"
  - Closed object { reason, type }
    
    Indicates that a thread has been closed.
    - reason: string
      
      Reason that the thread was closed. Defaults to null when no reason is recorded.
    - type: "closed"
      
      Status discriminator that is always closed.
      - "closed"
- title: string
  
  Optional human-readable title for the thread. Defaults to null when no title has been generated.
- user: string
  
  Free-form string that identifies your end user who owns the thread.
first_id: string

The ID of the first item in the list.
has_more: boolean

Whether there are more items available.
last_id: string

The ID of the last item in the list.
object: "list"

The type of object returned, must be list.
- "list"

Example

curl https://api.openai.com/v1/chatkit/threads \
    -H 'OpenAI-Beta: chatkit_beta=v1' \
    -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "data": [
    {
      "id": "cthr_def456",
      "created_at": 1712345600,
      "object": "chatkit.thread",
      "status": {
        "type": "active"
      },
      "title": "Demo feedback",
      "user": "user_456"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id",
  "object": "list"
}

Example

curl "https://api.openai.com/v1/chatkit/threads?limit=2&order=desc" \
  -H "OpenAI-Beta: chatkit_beta=v1" \
  -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "data": [
    {
      "id": "cthr_abc123",
      "object": "chatkit.thread",
      "title": "Customer escalation"
    },
    {
      "id": "cthr_def456",
      "object": "chatkit.thread",
      "title": "Demo feedback"
    }
  ],
  "has_more": false,
  "object": "list"
}

Domain Types

Chat Session

ChatSession object { id, chatkit_configuration, client_secret, 7 more }

Represents a ChatKit session and its resolved configuration.
- id: string
  
  Identifier for the ChatKit session.
- chatkit_configuration: ChatSessionChatKitConfiguration
  
  Resolved ChatKit feature configuration for the session.
  - automatic_thread_titling: ChatSessionAutomaticThreadTitling
    
    Automatic thread titling preferences.
    - enabled: boolean
      
      Whether automatic thread titling is enabled.
  - file_upload: ChatSessionFileUpload
    
    Upload settings for the session.
    - enabled: boolean
      
      Indicates if uploads are enabled for the session.
    - max_file_size: number
      
      Maximum upload size in megabytes.
    - max_files: number
      
      Maximum number of uploads allowed during the session.
  - history: ChatSessionHistory
    
    History retention configuration.
    - enabled: boolean
      
      Indicates if chat history is persisted for the session.
    - recent_threads: number
      
      Number of prior threads surfaced in history views. Defaults to null when all history is retained.
- client_secret: string
  
  Ephemeral client secret that authenticates session requests.
- expires_at: number
  
  Unix timestamp (in seconds) for when the session expires.
- max_requests_per_1_minute: number
  
  Convenience copy of the per-minute request limit.
- object: "chatkit.session"
  
  Type discriminator that is always chatkit.session.
  - "chatkit.session"
- rate_limits: ChatSessionRateLimits
  
  Resolved rate limit values.
  - max_requests_per_1_minute: number
    
    Maximum allowed requests per one-minute window.
- status: ChatSessionStatus
  
  Current lifecycle state of the session.
  - "active"
  - "expired"
  - "cancelled"
- user: string
  
  User identifier associated with the session.
- workflow: ChatKitWorkflow
  
  Workflow metadata for the session.
  - id: string
    
    Identifier of the workflow backing the session.
  - state_variables: map[string or boolean or number]
    
    State variable key-value pairs applied when invoking the workflow. Defaults to null when no overrides were provided.
    - string
    - boolean
    - number
  - tracing: object { enabled }
    
    Tracing settings applied to the workflow.
    - enabled: boolean
      
      Indicates whether tracing is enabled.
  - version: string
    
    Specific workflow version used for the session. Defaults to null when using the latest deployment.

Chat Session Automatic Thread Titling

ChatSessionAutomaticThreadTitling object { enabled }

Automatic thread title preferences for the session.
- enabled: boolean
  
  Whether automatic thread titling is enabled.

Chat Session ChatKit Configuration

ChatSessionChatKitConfiguration object { automatic_thread_titling, file_upload, history }

ChatKit configuration for the session.
- automatic_thread_titling: ChatSessionAutomaticThreadTitling
  
  Automatic thread titling preferences.
  - enabled: boolean
    
    Whether automatic thread titling is enabled.
- file_upload: ChatSessionFileUpload
  
  Upload settings for the session.
  - enabled: boolean
    
    Indicates if uploads are enabled for the session.
  - max_file_size: number
    
    Maximum upload size in megabytes.
  - max_files: number
    
    Maximum number of uploads allowed during the session.
- history: ChatSessionHistory
  
  History retention configuration.
  - enabled: boolean
    
    Indicates if chat history is persisted for the session.
  - recent_threads: number
    
    Number of prior threads surfaced in history views. Defaults to null when all history is retained.

Chat Session ChatKit Configuration Param

ChatSessionChatKitConfigurationParam object { automatic_thread_titling, file_upload, history }

Optional per-session configuration settings for ChatKit behavior.
- automatic_thread_titling: optional object { enabled }
  
  Configuration for automatic thread titling. When omitted, automatic thread titling is enabled by default.
  - enabled: optional boolean
    
    Enable automatic thread title generation. Defaults to true.
- file_upload: optional object { enabled, max_file_size, max_files }
  
  Configuration for upload enablement and limits. When omitted, uploads are disabled by default (max_files 10, max_file_size 512 MB).
  - enabled: optional boolean
    
    Enable uploads for this session. Defaults to false.
  - max_file_size: optional number
    
    Maximum size in megabytes for each uploaded file. Defaults to 512 MB, which is the maximum allowable size.
  - max_files: optional number
    
    Maximum number of files that can be uploaded to the session. Defaults to 10.
- history: optional object { enabled, recent_threads }
  
  Configuration for chat history retention. When omitted, history is enabled by default with no limit on recent_threads (null).
  - enabled: optional boolean
    
    Enables chat users to access previous ChatKit threads. Defaults to true.
  - recent_threads: optional number
    
    Number of recent ChatKit threads users have access to. Defaults to unlimited when unset.

Chat Session Expires After Param

ChatSessionExpiresAfterParam object { anchor, seconds }

Controls when the session expires relative to an anchor timestamp.
- anchor: "created_at"
  
  Base timestamp used to calculate expiration. Currently fixed to created_at.
  - "created_at"
- seconds: number
  
  Number of seconds after the anchor when the session expires.

Chat Session File Upload

ChatSessionFileUpload object { enabled, max_file_size, max_files }

Upload permissions and limits applied to the session.
- enabled: boolean
  
  Indicates if uploads are enabled for the session.
- max_file_size: number
  
  Maximum upload size in megabytes.
- max_files: number
  
  Maximum number of uploads allowed during the session.

Chat Session History

ChatSessionHistory object { enabled, recent_threads }

History retention preferences returned for the session.
- enabled: boolean
  
  Indicates if chat history is persisted for the session.
- recent_threads: number
  
  Number of prior threads surfaced in history views. Defaults to null when all history is retained.

Chat Session Rate Limits

ChatSessionRateLimits object { max_requests_per_1_minute }

Active per-minute request limit for the session.
- max_requests_per_1_minute: number
  
  Maximum allowed requests per one-minute window.

Chat Session Rate Limits Param

ChatSessionRateLimitsParam object { max_requests_per_1_minute }

Controls request rate limits for the session.
- max_requests_per_1_minute: optional number
  
  Maximum number of requests allowed per minute for the session. Defaults to 10.

Chat Session Status

ChatSessionStatus = "active" or "expired" or "cancelled"
- "active"
- "expired"
- "cancelled"

Chat Session Workflow Param

ChatSessionWorkflowParam object { id, state_variables, tracing, version }

Workflow reference and overrides applied to the chat session.
- id: string
  
  Identifier for the workflow invoked by the session.
- state_variables: optional map[string or boolean or number]
  
  State variables forwarded to the workflow. Keys may be up to 64 characters, values must be primitive types, and the map defaults to an empty object.
  - string
  - boolean
  - number
- tracing: optional object { enabled }
  
  Optional tracing overrides for the workflow invocation. When omitted, tracing is enabled by default.
  - enabled: optional boolean
    
    Whether tracing is enabled during the session. Defaults to true.
- version: optional string
  
  Specific workflow version to run. Defaults to the latest deployed version.

ChatKit Attachment

ChatKitAttachment object { id, mime_type, name, 2 more }

Attachment metadata included on thread items.
- id: string
  
  Identifier for the attachment.
- mime_type: string
  
  MIME type of the attachment.
- name: string
  
  Original display name for the attachment.
- preview_url: string
  
  Preview URL for rendering the attachment inline.
- type: "image" or "file"
  
  Attachment discriminator.
  - "image"
  - "file"

ChatKit Response Output Text

ChatKitResponseOutputText object { annotations, text, type }

Assistant response text accompanied by optional annotations.
- annotations: array of object { source, type } or object { source, type }
  
  Ordered list of annotations attached to the response text.
  - File object { source, type }
    
    Annotation that references an uploaded file.
    - source: object { filename, type }
      
      File attachment referenced by the annotation.
      - filename: string
        
        Filename referenced by the annotation.
      - type: "file"
        
        Type discriminator that is always file.
        
        "file"
    - type: "file"
      
      Type discriminator that is always file for this annotation.
      - "file"
  - URL object { source, type }
    
    Annotation that references a URL.
    - source: object { type, url }
      
      URL referenced by the annotation.
      - type: "url"
        
        Type discriminator that is always url.
        
        "url"
      - url: string
        
        URL referenced by the annotation.
    - type: "url"
      
      Type discriminator that is always url for this annotation.
      - "url"
- text: string
  
  Assistant generated text.
- type: "output_text"
  
  Type discriminator that is always output_text.
  - "output_text"

ChatKit Thread

ChatKitThread object { id, created_at, object, 3 more }

Represents a ChatKit thread and its current status.
- id: string
  
  Identifier of the thread.
- created_at: number
  
  Unix timestamp (in seconds) for when the thread was created.
- object: "chatkit.thread"
  
  Type discriminator that is always chatkit.thread.
  - "chatkit.thread"
- status: object { type } or object { reason, type } or object { reason, type }
  
  Current status for the thread. Defaults to active for newly created threads.
  - Active object { type }
    
    Indicates that a thread is active.
    - type: "active"
      
      Status discriminator that is always active.
      - "active"
  - Locked object { reason, type }
    
    Indicates that a thread is locked and cannot accept new input.
    - reason: string
      
      Reason that the thread was locked. Defaults to null when no reason is recorded.
    - type: "locked"
      
      Status discriminator that is always locked.
      - "locked"
  - Closed object { reason, type }
    
    Indicates that a thread has been closed.
    - reason: string
      
      Reason that the thread was closed. Defaults to null when no reason is recorded.
    - type: "closed"
      
      Status discriminator that is always closed.
      - "closed"
- title: string
  
  Optional human-readable title for the thread. Defaults to null when no title has been generated.
- user: string
  
  Free-form string that identifies your end user who owns the thread.

ChatKit Thread Assistant Message Item

ChatKitThreadAssistantMessageItem object { id, content, created_at, 3 more }

Assistant-authored message within a thread.
- id: string
  
  Identifier of the thread item.
- content: array of ChatKitResponseOutputText
  
  Ordered assistant response segments.
  - annotations: array of object { source, type } or object { source, type }
    
    Ordered list of annotations attached to the response text.
    - File object { source, type }
      
      Annotation that references an uploaded file.
      - source: object { filename, type }
        
        File attachment referenced by the annotation.
        
        filename: string
        
        Filename referenced by the annotation.
        
        type: "file"
        
        Type discriminator that is always file.
        
        "file"
      - type: "file"
        
        Type discriminator that is always file for this annotation.
        
        "file"
    - URL object { source, type }
      
      Annotation that references a URL.
      - source: object { type, url }
        
        URL referenced by the annotation.
        
        type: "url"
        
        Type discriminator that is always url.
        
        "url"
        
        url: string
        
        URL referenced by the annotation.
      - type: "url"
        
        Type discriminator that is always url for this annotation.
        
        "url"
  - text: string
    
    Assistant generated text.
  - type: "output_text"
    
    Type discriminator that is always output_text.
    - "output_text"
- created_at: number
  
  Unix timestamp (in seconds) for when the item was created.
- object: "chatkit.thread_item"
  
  Type discriminator that is always chatkit.thread_item.
  - "chatkit.thread_item"
- thread_id: string
  
  Identifier of the parent thread.
- type: "chatkit.assistant_message"
  
  Type discriminator that is always chatkit.assistant_message.
  - "chatkit.assistant_message"

ChatKit Thread Item List

ChatKitThreadItemList object { data, first_id, has_more, 2 more }

A paginated list of thread items rendered for the ChatKit API.
- data: array of ChatKitThreadUserMessageItem or ChatKitThreadAssistantMessageItem or ChatKitWidgetItem or 3 more
  
  A list of items
  - ChatKitThreadUserMessageItem object { id, attachments, content, 5 more }
    
    User-authored messages within a thread.
    - id: string
      
      Identifier of the thread item.
    - attachments: array of ChatKitAttachment
      
      Attachments associated with the user message. Defaults to an empty list.
      - id: string
        
        Identifier for the attachment.
      - mime_type: string
        
        MIME type of the attachment.
      - name: string
        
        Original display name for the attachment.
      - preview_url: string
        
        Preview URL for rendering the attachment inline.
      - type: "image" or "file"
        
        Attachment discriminator.
        
        "image"
        
        "file"
    - content: array of object { text, type } or object { text, type }
      
      Ordered content elements supplied by the user.
      - InputText object { text, type }
        
        Text block that a user contributed to the thread.
        
        text: string
        
        Plain-text content supplied by the user.
        
        type: "input_text"
        
        Type discriminator that is always input_text.
        
        "input_text"
      - QuotedText object { text, type }
        
        Quoted snippet that the user referenced in their message.
        
        text: string
        
        Quoted text content.
        
        type: "quoted_text"
        
        Type discriminator that is always quoted_text.
        
        "quoted_text"
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - inference_options: object { model, tool_choice }
      
      Inference overrides applied to the message. Defaults to null when unset.
      - model: string
        
        Model name that generated the response. Defaults to null when using the session default.
      - tool_choice: object { id }
        
        Preferred tool to invoke. Defaults to null when ChatKit should auto-select.
        
        id: string
        
        Identifier of the requested tool.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.user_message"
      - "chatkit.user_message"
  - ChatKitThreadAssistantMessageItem object { id, content, created_at, 3 more }
    
    Assistant-authored message within a thread.
    - id: string
      
      Identifier of the thread item.
    - content: array of ChatKitResponseOutputText
      
      Ordered assistant response segments.
      - annotations: array of object { source, type } or object { source, type }
        
        Ordered list of annotations attached to the response text.
        
        File object { source, type }
        
        Annotation that references an uploaded file.
        
        source: object { filename, type }
        
        File attachment referenced by the annotation.
        
        filename: string
        
        Filename referenced by the annotation.
        
        type: "file"
        
        Type discriminator that is always file.
        
        "file"
        
        type: "file"
        
        Type discriminator that is always file for this annotation.
        
        "file"
        
        URL object { source, type }
        
        Annotation that references a URL.
        
        source: object { type, url }
        
        URL referenced by the annotation.
        
        type: "url"
        
        Type discriminator that is always url.
        
        "url"
        
        url: string
        
        URL referenced by the annotation.
        
        type: "url"
        
        Type discriminator that is always url for this annotation.
        
        "url"
      - text: string
        
        Assistant generated text.
      - type: "output_text"
        
        Type discriminator that is always output_text.
        
        "output_text"
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.assistant_message"
      
      Type discriminator that is always chatkit.assistant_message.
      - "chatkit.assistant_message"
  - ChatKitWidgetItem object { id, created_at, object, 3 more }
    
    Thread item that renders a widget payload.
    - id: string
      
      Identifier of the thread item.
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.widget"
      
      Type discriminator that is always chatkit.widget.
      - "chatkit.widget"
    - widget: string
      
      Serialized widget payload rendered in the UI.
  - ChatKitClientToolCall object { id, arguments, call_id, 7 more }
    
    Record of a client side tool invocation initiated by the assistant.
    - id: string
      
      Identifier of the thread item.
    - arguments: string
      
      JSON-encoded arguments that were sent to the tool.
    - call_id: string
      
      Identifier for the client tool call.
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - name: string
      
      Tool name that was invoked.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - output: string
      
      JSON-encoded output captured from the tool. Defaults to null while execution is in progress.
    - status: "in_progress" or "completed"
      
      Execution status for the tool call.
      - "in_progress"
      - "completed"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.client_tool_call"
      
      Type discriminator that is always chatkit.client_tool_call.
      - "chatkit.client_tool_call"
  - ChatKitTask object { id, created_at, heading, 5 more }
    
    Task emitted by the workflow to show progress and status updates.
    - id: string
      
      Identifier of the thread item.
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - heading: string
      
      Optional heading for the task. Defaults to null when not provided.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - summary: string
      
      Optional summary that describes the task. Defaults to null when omitted.
    - task_type: "custom" or "thought"
      
      Subtype for the task.
      - "custom"
      - "thought"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.task"
      
      Type discriminator that is always chatkit.task.
      - "chatkit.task"
  - ChatKitTaskGroup object { id, created_at, object, 3 more }
    
    Collection of workflow tasks grouped together in the thread.
    - id: string
      
      Identifier of the thread item.
    - created_at: number
      
      Unix timestamp (in seconds) for when the item was created.
    - object: "chatkit.thread_item"
      
      Type discriminator that is always chatkit.thread_item.
      - "chatkit.thread_item"
    - tasks: array of object { heading, summary, type }
      
      Tasks included in the group.
      - heading: string
        
        Optional heading for the grouped task. Defaults to null when not provided.
      - summary: string
        
        Optional summary that describes the grouped task. Defaults to null when omitted.
      - type: "custom" or "thought"
        
        Subtype for the grouped task.
        
        "custom"
        
        "thought"
    - thread_id: string
      
      Identifier of the parent thread.
    - type: "chatkit.task_group"
      
      Type discriminator that is always chatkit.task_group.
      - "chatkit.task_group"
- first_id: string
  
  The ID of the first item in the list.
- has_more: boolean
  
  Whether there are more items available.
- last_id: string
  
  The ID of the last item in the list.
- object: "list"
  
  The type of object returned, must be list.
  - "list"

ChatKit Thread User Message Item

ChatKitThreadUserMessageItem object { id, attachments, content, 5 more }

User-authored messages within a thread.
- id: string
  
  Identifier of the thread item.
- attachments: array of ChatKitAttachment
  
  Attachments associated with the user message. Defaults to an empty list.
  - id: string
    
    Identifier for the attachment.
  - mime_type: string
    
    MIME type of the attachment.
  - name: string
    
    Original display name for the attachment.
  - preview_url: string
    
    Preview URL for rendering the attachment inline.
  - type: "image" or "file"
    
    Attachment discriminator.
    - "image"
    - "file"
- content: array of object { text, type } or object { text, type }
  
  Ordered content elements supplied by the user.
  - InputText object { text, type }
    
    Text block that a user contributed to the thread.
    - text: string
      
      Plain-text content supplied by the user.
    - type: "input_text"
      
      Type discriminator that is always input_text.
      - "input_text"
  - QuotedText object { text, type }
    
    Quoted snippet that the user referenced in their message.
    - text: string
      
      Quoted text content.
    - type: "quoted_text"
      
      Type discriminator that is always quoted_text.
      - "quoted_text"
- created_at: number
  
  Unix timestamp (in seconds) for when the item was created.
- inference_options: object { model, tool_choice }
  
  Inference overrides applied to the message. Defaults to null when unset.
  - model: string
    
    Model name that generated the response. Defaults to null when using the session default.
  - tool_choice: object { id }
    
    Preferred tool to invoke. Defaults to null when ChatKit should auto-select.
    - id: string
      
      Identifier of the requested tool.
- object: "chatkit.thread_item"
  
  Type discriminator that is always chatkit.thread_item.
  - "chatkit.thread_item"
- thread_id: string
  
  Identifier of the parent thread.
- type: "chatkit.user_message"
  - "chatkit.user_message"

ChatKitWidgetItem object { id, created_at, object, 3 more }

Thread item that renders a widget payload.
- id: string
  
  Identifier of the thread item.
- created_at: number
  
  Unix timestamp (in seconds) for when the item was created.
- object: "chatkit.thread_item"
  
  Type discriminator that is always chatkit.thread_item.
  - "chatkit.thread_item"
- thread_id: string
  
  Identifier of the parent thread.
- type: "chatkit.widget"
  
  Type discriminator that is always chatkit.widget.
  - "chatkit.widget"
- widget: string
  
  Serialized widget payload rendered in the UI.

Thread Delete Response

ThreadDeleteResponse object { id, deleted, object }

Confirmation payload returned after deleting a thread.
- id: string
  
  Identifier of the deleted thread.
- deleted: boolean
  
  Indicates that the thread has been deleted.
- object: "chatkit.thread.deleted"
  
  Type discriminator that is always chatkit.thread.deleted.
  - "chatkit.thread.deleted"

resources/beta/subresources/chatkit/index.md 2026-04-30 06:13 UTC to 2026-05-02 05:57 UTC

ChatKit

Domain Types

ChatKit Workflow

Sessions

Cancel chat session

Path Parameters

Returns

Example

Response

Example

Response

Create ChatKit session

Body Parameters

Returns

Example

Response

Example

Response

Threads

List ChatKit thread items

Path Parameters

Query Parameters

Returns

Example

Response

Example

Response

Retrieve ChatKit thread

Path Parameters

Returns

Example

Response

Example

Response

Delete ChatKit thread

Path Parameters

Returns

Example

Response

List ChatKit threads

Query Parameters

Returns

Example

Response

Example

Response

Domain Types

Chat Session

Chat Session Automatic Thread Titling

Chat Session ChatKit Configuration

Chat Session ChatKit Configuration Param

Chat Session Expires After Param

Chat Session File Upload

Chat Session History

Chat Session Rate Limits

Chat Session Rate Limits Param

Chat Session Status

Chat Session Workflow Param

ChatKit Attachment

ChatKit Response Output Text

ChatKit Thread

ChatKit Thread Assistant Message Item

ChatKit Thread Item List

ChatKit Thread User Message Item

ChatKit Widget Item

Thread Delete Response