models.md Codex Docs, 2026-02-19 20:37 UTC → 2026-05-12 01:59 UTC

1# Codex Models1# Codex Models

2 2 

3Meet the AI models that power Codex

4 

5## Recommended models3## Recommended models

6 4 

7![gpt-5.3-codex](/images/codex/codex-wallpaper-1.webp)5<div class="not-prose grid gap-6 md:grid-cols-2 xl:grid-cols-3">

8 6 <ModelDetails

9gpt-5.3-codex7 client:load

10 8 name="gpt-5.5"

11Most capable agentic coding model to date, combining frontier coding performance with stronger reasoning and professional knowledge capabilities.9 slug="gpt-5.5"

12 10 wallpaperUrl="/images/api/models/gpt-5.5.jpg"

13codex -m gpt-5.3-codex11 description="OpenAI's newest frontier model for complex coding, computer use, knowledge work, and research workflows in Codex."

14 12 data={{

15Copy command13 features: [

16 14 {

17Capability15 title: "Capability",

18 16 value: "",

19Speed17 icons: [

20 18 "openai.SparklesFilled",

21Codex CLI & SDK19 "openai.SparklesFilled",

22 20 "openai.SparklesFilled",

23Codex app & IDE extension21 "openai.SparklesFilled",

24 22 "openai.SparklesFilled",

25Codex Cloud23 ],

26 24 },

27ChatGPT Credits25 {

28 26 title: "Speed",

29API Access27 value: "",

30 28 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

31![gpt-5.3-codex-spark](/images/codex/codex-wallpaper-2.webp)29 },

32 30 {

33gpt-5.3-codex-spark31 title: "Codex CLI & SDK",

34 32 value: true,

35Text-only research preview model optimized for near-instant, real-time coding iteration. Available to ChatGPT Pro users.33 },

36 34 { title: "Codex app & IDE extension", value: true },

37codex -m gpt-5.3-codex-spark35 {

38 36 title: "Codex Cloud",

39Copy command37 value: false,

40 38 },

41Capability39 { title: "ChatGPT Credits", value: true },

42 40 { title: "API Access", value: false },

43Speed41 ],

44 42 }}

45Codex CLI & SDK43 />

46 44 

47Codex app & IDE extension45<ModelDetails

48 46 client:load

49Codex Cloud47 name="gpt-5.4"

50 48 slug="gpt-5.4"

51ChatGPT Credits49 wallpaperUrl="/images/api/models/gpt-5.4.jpg"

52 50 description="Flagship 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."

53API Access51 data={{

54 52 features: [

55![gpt-5.2-codex](/images/codex/gpt-5.2-codex.png)53 {

56 54 title: "Capability",

57gpt-5.2-codex55 value: "",

58 56 icons: [

59Advanced coding model for real-world engineering. Succeeded by GPT-5.3-Codex.57 "openai.SparklesFilled",

60 58 "openai.SparklesFilled",

61codex -m gpt-5.2-codex59 "openai.SparklesFilled",

62 60 "openai.SparklesFilled",

63Copy command61 "openai.SparklesFilled",

64 62 ],

65Capability63 },

66 64 {

67Speed65 title: "Speed",

68 66 value: "",

69Codex CLI & SDK67 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

70 68 },

71Codex app & IDE extension69 {

72 70 title: "Codex CLI & SDK",

73Codex Cloud71 value: true,

74 72 },

75ChatGPT Credits73 { title: "Codex app & IDE extension", value: true },

76 74 {

77API Access75 title: "Codex Cloud",

78 76 value: false,

79For most coding tasks in Codex, start with gpt-5.3-codex. It is available for77 },

80ChatGPT-authenticated Codex sessions in the Codex app, CLI, IDE extension, and78 { title: "ChatGPT Credits", value: true },

81Codex Cloud. API access for GPT-5.3-Codex will come soon. The79 { title: "API Access", value: true },

82gpt-5.3-codex-spark model is available in research preview for ChatGPT Pro80 ],

83subscribers.81 }}

82/>

83 

84<ModelDetails

85 client:load

86 name="gpt-5.4-mini"

87 slug="gpt-5.4-mini"

88 wallpaperUrl="/images/api/models/gpt-5-mini.jpg"

89 description="Fast, efficient mini model for responsive coding tasks and subagents."

90 data={{

91 features: [

92 {

93 title: "Capability",

94 value: "",

95 icons: [

96 "openai.SparklesFilled",

97 "openai.SparklesFilled",

98 "openai.SparklesFilled",

99 ],

100 },

101 {

102 title: "Speed",

103 value: "",

104 icons: ["openai.Flash", "openai.Flash", "openai.Flash", "openai.Flash"],

105 },

106 {

107 title: "Codex CLI & SDK",

108 value: true,

109 },

110 { title: "Codex app & IDE extension", value: true },

111 {

112 title: "Codex Cloud",

113 value: false,

114 },

115 { title: "ChatGPT Credits", value: true },

116 { title: "API Access", value: true },

117 ],

118 }}

119/>

120 

121<ModelDetails

122 client:load

123 name="gpt-5.3-codex"

124 slug="gpt-5.3-codex"

125 wallpaperUrl="/images/codex/codex-wallpaper-1.webp"

126 description="Industry-leading coding model for complex software engineering. Its coding capabilities now also power GPT-5.4."

127 data={{

128 features: [

129 {

130 title: "Capability",

131 value: "",

132 icons: [

133 "openai.SparklesFilled",

134 "openai.SparklesFilled",

135 "openai.SparklesFilled",

136 "openai.SparklesFilled",

137 "openai.SparklesFilled",

138 ],

139 },

140 {

141 title: "Speed",

142 value: "",

143 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

144 },

145 {

146 title: "Codex CLI & SDK",

147 value: true,

148 },

149 { title: "Codex app & IDE extension", value: true },

150 {

151 title: "Codex Cloud",

152 value: true,

153 },

154 { title: "ChatGPT Credits", value: true },

155 { title: "API Access", value: true },

156 ],

157 }}

158/>

159 

160<ModelDetails

161 client:load

162 name="gpt-5.3-codex-spark"

163 slug="gpt-5.3-codex-spark"

164 wallpaperUrl="/images/codex/codex-wallpaper-2.webp"

165 description="Text-only research preview model optimized for near-instant, real-time coding iteration. Available to ChatGPT Pro users."

166 data={{

167 features: [

168 {

169 title: "Capability",

170 value: "",

171 icons: [

172 "openai.SparklesFilled",

173 "openai.SparklesFilled",

174 "openai.SparklesFilled",

175 ],

176 },

177 {

178 title: "Speed",

179 value: "",

180 icons: [

181 "openai.Flash",

182 "openai.Flash",

183 "openai.Flash",

184 "openai.Flash",

185 "openai.Flash",

186 ],

187 },

188 {

189 title: "Codex CLI & SDK",

190 value: true,

191 },

192 { title: "Codex app & IDE extension", value: true },

193 {

194 title: "Codex Cloud",

195 value: false,

196 },

197 { title: "ChatGPT Credits", value: false },

198 { title: "API Access", value: false },

199 ],

200 }}

201/>

202 

203</div>

204 

205For most tasks in Codex, start with `gpt-5.5` when it appears in your model

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

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

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

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

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

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

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

213 real-time coding iteration.

84 214 

85## Alternative models215## Alternative models

86 216 

87![gpt-5.2](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.2.jpg)217<div class="not-prose grid gap-4 md:grid-cols-2 xl:grid-cols-3">

88 218<ModelDetails

89gpt-5.2219 client:load

90 220 name="gpt-5.2"

91Our best general agentic model for tasks across industries and domains.221 slug="gpt-5.2"

92 222 description="Previous general-purpose model for coding and agentic tasks, including hard debugging tasks that benefit from deeper deliberation."

93codex -m gpt-5.2223 collapsible

94 224 data={{

95Copy command225 features: [

96 226 {

97Show details227 title: "Capability",

98 228 value: "",

99![gpt-5.1-codex-max](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.1-codex-max.jpg)229 icons: [

100 230 "openai.SparklesFilled",

101gpt-5.1-codex-max231 "openai.SparklesFilled",

102 232 "openai.SparklesFilled",

103Optimized for long-horizon, agentic coding tasks in Codex.233 "openai.SparklesFilled",

104 234 ],

105codex -m gpt-5.1-codex-max235 },

106 236 {

107Copy command237 title: "Speed",

108 238 value: "",

109Show details239 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

110 240 },

111![gpt-5.1](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.1.jpg)241 {

112 242 title: "Codex CLI & SDK",

113gpt-5.1243 value: true,

114 244 },

115Great for coding and agentic tasks across domains. Succeeded by GPT-5.2.245 { title: "Codex app & IDE extension", value: true },

116 246 {

117codex -m gpt-5.1247 title: "Codex Cloud",

118 248 value: false,

119Copy command249 },

120 250 { title: "ChatGPT Credits", value: true },

121Show details251 { title: "API Access", value: true },

122 252 ],

123![gpt-5.1-codex](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.1-codex.jpg)253 }}

124 254/>

125gpt-5.1-codex255 

126 256 </div>

127Optimized for long-running, agentic coding tasks in Codex. Succeeded by GPT-5.1-Codex-Max.

128 

129codex -m gpt-5.1-codex

130 

131Copy command

132 

133Show details

134 

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

136 

137gpt-5-codex

138 

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

140 

141codex -m gpt-5-codex

142 

143Copy command

144 

145Show details

146 

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

148 

149gpt-5-codex-mini

150 

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

152 

153codex -m gpt-5-codex

154 

155Copy command

156 

157Show details

158 

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

160 

161gpt-5

162 

163Reasoning model for coding and agentic tasks across domains. Succeeded by GPT-5.1.

164 

165codex -m gpt-5

166 

167Copy command

168 

169Show details

170 257 

171## Other models258## Other models

172 259 

173Codex works best with the models listed above.260When you sign in with ChatGPT, Codex works best with the models listed above.

174 261 

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.262You 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.

176 263 

183 270 

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.271The 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.

185 272 

273```toml

274model = "gpt-5.5"

186```275```

187model = "gpt-5.2"276 

188```277If `gpt-5.5` isn't available in your account yet, use `gpt-5.4`.

189 278 

190### Choosing a different local model temporarily279### Choosing a different local model temporarily

191 280 

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:283To 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:

195 284 

196```bash285```bash

197codex -m gpt-5.3-codex286codex -m gpt-5.5

198```287```

199 288 

200### Choosing your model for cloud tasks289### Choosing your model for cloud tasks