models.md Codex Docs, 2026-03-11 00:31 UTC → 2026-04-29 00:50 UTC

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3## Recommended models3## Recommended models

4 4 

5![gpt-5.4](/images/api/models/gpt-5.4.jpg)5![gpt-5.5](/images/api/models/gpt-5.5.jpg)

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7gpt-5.47gpt-5.5

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9Flagship 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.9OpenAI's newest frontier model for complex coding, computer use, knowledge work, and research workflows in Codex.

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11codex -m gpt-5.411codex -m gpt-5.5

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13Copy command13Copy command

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27API Access27API Access

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29![gpt-5.3-codex](/images/codex/codex-wallpaper-1.webp)29![gpt-5.4](/images/api/models/gpt-5.4.jpg)

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31gpt-5.3-codex31gpt-5.4

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33Industry-leading coding model for complex software engineering. Its coding capabilities now also power GPT-5.4.33Flagship 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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35codex -m gpt-5.3-codex35codex -m gpt-5.4

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37Copy command37Copy command

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50 50 

51API Access51API Access

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53![gpt-5.3-codex-spark](/images/codex/codex-wallpaper-2.webp)53![gpt-5.4-mini](/images/api/models/gpt-5-mini.jpg)

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55gpt-5.3-codex-spark55gpt-5.4-mini

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57Text-only research preview model optimized for near-instant, real-time coding iteration. Available to ChatGPT Pro users.57Fast, efficient mini model for responsive coding tasks and subagents.

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59codex -m gpt-5.3-codex-spark59codex -m gpt-5.4-mini

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61Copy command61Copy command

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74 74 

75API Access75API Access

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77For most tasks in Codex, start with `gpt-5.4`. It combines strong coding,77![gpt-5.3-codex](/images/codex/codex-wallpaper-1.webp)

78reasoning, native computer use, and broader professional workflows in one

79model. The `gpt-5.3-codex-spark` model is available in research preview for

80ChatGPT Pro subscribers and is optimized for near-instant, real-time coding

81iteration.

82 

83## Alternative models

84 

85![gpt-5.2-codex](/images/codex/gpt-5.2-codex.png)

86 

87gpt-5.2-codex

88 

89Advanced coding model for real-world engineering. Succeeded by GPT-5.3-Codex.

90 

91codex -m gpt-5.2-codex

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93Copy command

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95Show details

96 

97![gpt-5.2](/images/api/models/gpt-5.2.jpg)

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99gpt-5.2

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101Previous general-purpose model for coding and agentic tasks across industries and domains. Succeeded by GPT-5.4.

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103codex -m gpt-5.2

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105Copy command

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107Show details

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109![gpt-5.1-codex-max](/images/api/models/gpt-5.1-codex-max.jpg)

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111gpt-5.1-codex-max79gpt-5.3-codex

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113Optimized 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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115codex -m gpt-5.1-codex-max83codex -m gpt-5.3-codex

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117Copy command85Copy command

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119Show details87Capability

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121![gpt-5.1](/images/api/models/gpt-5.1.jpg)89Speed

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123gpt-5.191Codex CLI & SDK

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125Great for coding and agentic tasks across domains. Succeeded by GPT-5.2.93Codex app & IDE extension

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127codex -m gpt-5.195Codex Cloud

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129Copy command97ChatGPT Credits

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131Show details99API Access

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133![gpt-5.1-codex](/images/api/models/gpt-5.1-codex.jpg)101![gpt-5.3-codex-spark](/images/codex/codex-wallpaper-2.webp)

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135gpt-5.1-codex103gpt-5.3-codex-spark

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137Optimized 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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139codex -m gpt-5.1-codex107codex -m gpt-5.3-codex-spark

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141Copy command109Copy command

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143Show details111Capability

144 

145![gpt-5-codex](/images/api/models/gpt-5-codex.jpg)

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147gpt-5-codex

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149Version of GPT-5 tuned for long-running, agentic coding tasks. Succeeded by GPT-5.1-Codex.

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151codex -m gpt-5-codex113Speed

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153Copy command115Codex CLI & SDK

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155Show details117Codex app & IDE extension

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157![gpt-5-codex-mini](/images/api/models/gpt-5-codex.jpg)119Codex Cloud

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159gpt-5-codex-mini121ChatGPT Credits

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161Smaller, more cost-effective version of GPT-5-Codex. Succeeded by GPT-5.1-Codex-Mini.123API Access

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163codex -m gpt-5-codex125For 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.

164 134 

165Copy command135## Alternative models

166 

167Show details

168 136 

169![gpt-5](/images/api/models/gpt-5.jpg)137![gpt-5.2](/images/api/models/gpt-5.2.jpg)

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171gpt-5139gpt-5.2

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173Reasoning 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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175codex -m gpt-5143codex -m gpt-5.2

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177Copy command145Copy command

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180 148 

181## Other models149## Other models

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183Codex 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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185You 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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193 161 

194The 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.

195 163 

196```164```toml

197model = "gpt-5.4"165model = "gpt-5.5"

198```166```

199 167 

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

169 

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

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202In the Codex CLI, you can use the `/model` command during an active thread to change the model. In the IDE extension, you can use the model selector below the input box to choose your model.172In the Codex CLI, you can use the `/model` command during an active thread to change the model. In the IDE extension, you can use the model selector below the input box to choose your model.

204To 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:

205 175 

206```bash176```bash

207codex -m gpt-5.4177codex -m gpt-5.5

208```178```

209 179 

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