models.md Codex Docs, 2026-03-11 00:31 UTC → 2026-05-07 20:02 UTC

2 2 

3## Recommended models3## Recommended models

4 4 

5![gpt-5.4](/images/api/models/gpt-5.4.jpg)5<div class="not-prose grid gap-6 md:grid-cols-2 xl:grid-cols-3">

6 6 <ModelDetails

7gpt-5.47 client:load

8 8 name="gpt-5.5"

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.9 slug="gpt-5.5"

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

11codex -m gpt-5.411 description="OpenAI's newest frontier model for complex coding, computer use, knowledge work, and research workflows in Codex."

12 12 data={{

13Copy command13 features: [

14 14 {

15Capability15 title: "Capability",

16 16 value: "",

17Speed17 icons: [

18 18 "openai.SparklesFilled",

19Codex CLI & SDK19 "openai.SparklesFilled",

20 20 "openai.SparklesFilled",

21Codex app & IDE extension21 "openai.SparklesFilled",

22 22 "openai.SparklesFilled",

23Codex Cloud23 ],

24 24 },

25ChatGPT Credits25 {

26 26 title: "Speed",

27API Access27 value: "",

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

29![gpt-5.3-codex](/images/codex/codex-wallpaper-1.webp)29 },

30 30 {

31gpt-5.3-codex31 title: "Codex CLI & SDK",

32 32 value: true,

33Industry-leading coding model for complex software engineering. Its coding capabilities now also power GPT-5.4.33 },

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

35codex -m gpt-5.3-codex35 {

36 36 title: "Codex Cloud",

37Copy command37 value: false,

38 38 },

39Capability39 { title: "ChatGPT Credits", value: true },

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

41Speed41 ],

42 42 }}

43Codex CLI & SDK43 />

44 44 

45Codex app & IDE extension45<ModelDetails

46 46 client:load

47Codex Cloud47 name="gpt-5.4"

48 48 slug="gpt-5.4"

49ChatGPT Credits49 wallpaperUrl="/images/api/models/gpt-5.4.jpg"

50 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."

51API Access51 data={{

52 52 features: [

53![gpt-5.3-codex-spark](/images/codex/codex-wallpaper-2.webp)53 {

54 54 title: "Capability",

55gpt-5.3-codex-spark55 value: "",

56 56 icons: [

57Text-only research preview model optimized for near-instant, real-time coding iteration. Available to ChatGPT Pro users.57 "openai.SparklesFilled",

58 58 "openai.SparklesFilled",

59codex -m gpt-5.3-codex-spark59 "openai.SparklesFilled",

60 60 "openai.SparklesFilled",

61Copy command61 "openai.SparklesFilled",

62 62 ],

63Capability63 },

64 64 {

65Speed65 title: "Speed",

66 66 value: "",

67Codex CLI & SDK67 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

68 68 },

69Codex app & IDE extension69 {

70 70 title: "Codex CLI & SDK",

71Codex Cloud71 value: true,

72 72 },

73ChatGPT Credits73 { title: "Codex app & IDE extension", value: true },

74 74 {

75API Access75 title: "Codex Cloud",

76 76 value: false,

77For most tasks in Codex, start with `gpt-5.4`. It combines strong coding,77 },

78reasoning, native computer use, and broader professional workflows in one78 { title: "ChatGPT Credits", value: true },

79model. The `gpt-5.3-codex-spark` model is available in research preview for79 { title: "API Access", value: true },

80ChatGPT Pro subscribers and is optimized for near-instant, real-time coding80 ],

81iteration.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.

82 214 

83## Alternative models215## Alternative models

84 216 

85![gpt-5.2-codex](/images/codex/gpt-5.2-codex.png)217<div class="not-prose grid gap-4 md:grid-cols-2 xl:grid-cols-3">

86 218<ModelDetails

87gpt-5.2-codex219 client:load

88 220 name="gpt-5.2"

89Advanced coding model for real-world engineering. Succeeded by GPT-5.3-Codex.221 slug="gpt-5.2"

90 222 description="Previous general-purpose model for coding and agentic tasks, including hard debugging tasks that benefit from deeper deliberation."

91codex -m gpt-5.2-codex223 collapsible

92 224 data={{

93Copy command225 features: [

94 226 {

95Show details227 title: "Capability",

96 228 value: "",

97![gpt-5.2](/images/api/models/gpt-5.2.jpg)229 icons: [

98 230 "openai.SparklesFilled",

99gpt-5.2231 "openai.SparklesFilled",

100 232 "openai.SparklesFilled",

101Previous general-purpose model for coding and agentic tasks across industries and domains. Succeeded by GPT-5.4.233 "openai.SparklesFilled",

102 234 ],

103codex -m gpt-5.2235 },

104 236 {

105Copy command237 title: "Speed",

106 238 value: "",

107Show details239 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

108 240 },

109![gpt-5.1-codex-max](/images/api/models/gpt-5.1-codex-max.jpg)241 {

110 242 title: "Codex CLI & SDK",

111gpt-5.1-codex-max243 value: true,

112 244 },

113Optimized for long-horizon, agentic coding tasks in Codex.245 { title: "Codex app & IDE extension", value: true },

114 246 {

115codex -m gpt-5.1-codex-max247 title: "Codex Cloud",

116 248 value: false,

117Copy command249 },

118 250 { title: "ChatGPT Credits", value: true },

119Show details251 { title: "API Access", value: true },

120 252 ],

121![gpt-5.1](/images/api/models/gpt-5.1.jpg)253 }}

122 254/>

123gpt-5.1255 

124 256 </div>

125Great for coding and agentic tasks across domains. Succeeded by GPT-5.2.

126 

127codex -m gpt-5.1

128 

129Copy command

130 

131Show details

132 

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

134 

135gpt-5.1-codex

136 

137Optimized for long-running, agentic coding tasks in Codex. Succeeded by GPT-5.1-Codex-Max.

138 

139codex -m gpt-5.1-codex

140 

141Copy command

142 

143Show details

144 

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

146 

147gpt-5-codex

148 

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

150 

151codex -m gpt-5-codex

152 

153Copy command

154 

155Show details

156 

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

158 

159gpt-5-codex-mini

160 

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

162 

163codex -m gpt-5-codex

164 

165Copy command

166 

167Show details

168 

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

170 

171gpt-5

172 

173Reasoning model for coding and agentic tasks across domains. Succeeded by GPT-5.1.

174 

175codex -m gpt-5

176 

177Copy command

178 

179Show details

180 257 

181## Other models258## Other models

182 259 

183Codex works best with the models listed above.260When you sign in with ChatGPT, Codex works best with the models listed above.

184 261 

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.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.

186 263 

193 270 

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.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.

195 272 

273```toml

274model = "gpt-5.5"

196```275```

197model = "gpt-5.4"276 

198```277If `gpt-5.5` isn't available in your account yet, use `gpt-5.4`.

199 278 

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

201 280 

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: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:

205 284 

206```bash285```bash

207codex -m gpt-5.4286codex -m gpt-5.5

208```287```

209 288 

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