1# Assistants API tools1# Assistants API tools

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3> For the complete documentation index, see [llms.txt](/llms.txt). Markdown versions of documentation pages are available by appending `.md` to the page URL.

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5After achieving feature parity in the Responses API, we've deprecated the Assistants API. It will shut down on August 26, 2026. Follow the [migration guide](https://developers.openai.com/platform/assistants/migration) to update your integration. [Learn more](https://platform.openai.com/docs/guides/migrate-to-responses).

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3## Overview7## Overview

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5Assistants created using the Assistants API can be equipped with tools that allow them to perform more complex tasks or interact with your application.9Assistants created using the Assistants API can be equipped with tools that allow them to perform more complex tasks or interact with your application.

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12<IconItem title="File Search" className="mt-2">16File Search

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15 Built-in RAG tool to process and search through files20 Built-in RAG tool to process and search through files

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21<IconItem title="Code Interpreter" className="mt-2">25Code Interpreter

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24 Write and run python code, process files and diverse data29 Write and run python code, process files and diverse data

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30<IconItem title="Function Calling" className="mt-2">34Function Calling

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33 Use your own custom functions to interact with your application38 Use your own custom functions to interact with your application

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38## Next steps42## Next steps

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40- See the API reference to [submit tool outputs](https://developers.openai.com/api/docs/api-reference/runs/submitToolOutputs)44- See the API reference to [submit tool outputs](https://developers.openai.com/api/reference/resources/beta/subresources/threads/subresources/runs/methods/submit_tool_outputs)

41- Build a tool-using assistant with our [Quickstart app](https://github.com/openai/openai-assistants-quickstart)45- Build a tool-using assistant with our [Quickstart app](https://github.com/openai/openai-assistants-quickstart)