models.md Codex Docs, 2026-02-19 20:37 UTC → 2026-04-24 18:20 UTC

1# Codex Models1# Codex Models

2 2 

3Meet the AI models that power Codex

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5## Recommended models3## Recommended models

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7![gpt-5.3-codex](/images/codex/codex-wallpaper-1.webp)5![gpt-5.5](/images/api/models/gpt-5.5.jpg)

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9gpt-5.3-codex7gpt-5.5

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11Most capable agentic coding model to date, combining frontier coding performance with stronger reasoning and professional knowledge capabilities.9OpenAI's newest frontier model for complex coding, computer use, knowledge work, and research workflows in Codex.

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13codex -m gpt-5.3-codex11codex -m gpt-5.5

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15Copy command13Copy command

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29API Access27API Access

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31![gpt-5.3-codex-spark](/images/codex/codex-wallpaper-2.webp)29![gpt-5.4](/images/api/models/gpt-5.4.jpg)

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33gpt-5.3-codex-spark31gpt-5.4

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35Text-only research preview model optimized for near-instant, real-time coding iteration. Available to ChatGPT Pro users.33Flagship frontier model for professional work that brings the industry-leading coding capabilities of GPT-5.3-Codex together with stronger reasoning, tool use, and agentic workflows.

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37codex -m gpt-5.3-codex-spark35codex -m gpt-5.4

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39Copy command37Copy command

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53API Access51API Access

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55![gpt-5.2-codex](/images/codex/gpt-5.2-codex.png)53![gpt-5.4-mini](/images/api/models/gpt-5-mini.jpg)

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57gpt-5.2-codex55gpt-5.4-mini

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59Advanced coding model for real-world engineering. Succeeded by GPT-5.3-Codex.57Fast, efficient mini model for responsive coding tasks and subagents.

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61codex -m gpt-5.2-codex59codex -m gpt-5.4-mini

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63Copy command61Copy command

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76 74 

77API Access75API Access

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79For most coding tasks in Codex, start with gpt-5.3-codex. It is available for77![gpt-5.3-codex](/images/codex/codex-wallpaper-1.webp)

80ChatGPT-authenticated Codex sessions in the Codex app, CLI, IDE extension, and

81Codex Cloud. API access for GPT-5.3-Codex will come soon. The

82gpt-5.3-codex-spark model is available in research preview for ChatGPT Pro

83subscribers.

84 

85## Alternative models

86 

87![gpt-5.2](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.2.jpg)

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89gpt-5.2

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91Our best general agentic model for tasks across industries and domains.

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93codex -m gpt-5.2

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95Copy command

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97Show details

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99![gpt-5.1-codex-max](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.1-codex-max.jpg)

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101gpt-5.1-codex-max79gpt-5.3-codex

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103Optimized for long-horizon, agentic coding tasks in Codex.81Industry-leading coding model for complex software engineering. Its coding capabilities now also power GPT-5.4.

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105codex -m gpt-5.1-codex-max83codex -m gpt-5.3-codex

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107Copy command85Copy command

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109Show details87Capability

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111![gpt-5.1](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.1.jpg)89Speed

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113gpt-5.191Codex CLI & SDK

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115Great for coding and agentic tasks across domains. Succeeded by GPT-5.2.93Codex app & IDE extension

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117codex -m gpt-5.195Codex Cloud

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119Copy command97ChatGPT Credits

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121Show details99API Access

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123![gpt-5.1-codex](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.1-codex.jpg)101![gpt-5.3-codex-spark](/images/codex/codex-wallpaper-2.webp)

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125gpt-5.1-codex103gpt-5.3-codex-spark

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127Optimized for long-running, agentic coding tasks in Codex. Succeeded by GPT-5.1-Codex-Max.105Text-only research preview model optimized for near-instant, real-time coding iteration. Available to ChatGPT Pro users.

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129codex -m gpt-5.1-codex107codex -m gpt-5.3-codex-spark

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131Copy command109Copy command

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133Show details111Capability

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135![gpt-5-codex](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5-codex.jpg)

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137gpt-5-codex

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139Version of GPT-5 tuned for long-running, agentic coding tasks. Succeeded by GPT-5.1-Codex.

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141codex -m gpt-5-codex

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143Copy command113Speed

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145Show details115Codex CLI & SDK

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147![gpt-5-codex-mini](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5-codex.jpg)117Codex app & IDE extension

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149gpt-5-codex-mini119Codex Cloud

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151Smaller, more cost-effective version of GPT-5-Codex. Succeeded by GPT-5.1-Codex-Mini.121ChatGPT Credits

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153codex -m gpt-5-codex123API Access

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155Copy command125For most tasks in Codex, start with `gpt-5.5` when it appears in your model

126 picker. It is strongest for complex coding, computer use, knowledge work, and

127 research workflows. GPT-5.5 is currently available in Codex when you sign in

128 with ChatGPT; it isn't available with API-key authentication. During the

129 rollout, continue using `gpt-5.4` if `gpt-5.5` is not yet available. Use

130 `gpt-5.4-mini` when you want a faster, lower-cost option for lighter coding

131 tasks or subagents. The `gpt-5.3-codex-spark` model is available in research

132 preview for ChatGPT Pro subscribers and is optimized for near-instant,

133 real-time coding iteration.

156 134 

157Show details135## Alternative models

158 136 

159![gpt-5](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.jpg)137![gpt-5.2](/images/api/models/gpt-5.2.jpg)

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161gpt-5139gpt-5.2

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163Reasoning model for coding and agentic tasks across domains. Succeeded by GPT-5.1.141Previous general-purpose model for coding and agentic tasks, including hard debugging tasks that benefit from deeper deliberation.

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165codex -m gpt-5143codex -m gpt-5.2

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167Copy command145Copy command

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170 148 

171## Other models149## Other models

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173Codex works best with the models listed above.151When you sign in with ChatGPT, Codex works best with the models listed above.

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175You can also point Codex at any model and provider that supports either the [Chat Completions](https://platform.openai.com/docs/api-reference/chat) or [Responses APIs](https://platform.openai.com/docs/api-reference/responses) to fit your specific use case.153You can also point Codex at any model and provider that supports either the [Chat Completions](https://platform.openai.com/docs/api-reference/chat) or [Responses APIs](https://platform.openai.com/docs/api-reference/responses) to fit your specific use case.

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183 161 

184The Codex CLI and IDE extension use the same `config.toml` [configuration file](https://developers.openai.com/codex/config-basic). To specify a model, add a `model` entry to your configuration file. If you don't specify a model, the Codex app, CLI, or IDE Extension defaults to a recommended model.162The Codex CLI and IDE extension use the same `config.toml` [configuration file](https://developers.openai.com/codex/config-basic). To specify a model, add a `model` entry to your configuration file. If you don't specify a model, the Codex app, CLI, or IDE Extension defaults to a recommended model.

185 163 

164```toml

165model = "gpt-5.5"

186```166```

187model = "gpt-5.2"167 

188```168If `gpt-5.5` isn't available in your account yet, use `gpt-5.4`.

189 169 

190### Choosing a different local model temporarily170### Choosing a different local model temporarily

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194To start a new Codex CLI thread with a specific model or to specify the model for `codex exec` you can use the `--model`/`-m` flag:174To start a new Codex CLI thread with a specific model or to specify the model for `codex exec` you can use the `--model`/`-m` flag:

195 175 

196```bash176```bash

197codex -m gpt-5.3-codex177codex -m gpt-5.5

198```178```

199 179 

200### Choosing your model for cloud tasks180### Choosing your model for cloud tasks