models.md Codex Docs, 2026-02-19 20:37 UTC → 2026-05-13 00:57 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: true },

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 or API-key authentication. Use `gpt-5.4-mini` when you want a

209 faster, lower-cost option for lighter coding tasks or subagents. The

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

211 subscribers and is optimized for near-instant, real-time coding iteration.

84 212 

85## Alternative models213## Alternative models

86 214 

87![gpt-5.2](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.2.jpg)215<div class="not-prose grid gap-4 md:grid-cols-2 xl:grid-cols-3">

88 216<ModelDetails

89gpt-5.2217 client:load

90 218 name="gpt-5.2"

91Our best general agentic model for tasks across industries and domains.219 slug="gpt-5.2"

92 220 description="Previous general-purpose model for coding and agentic tasks, including hard debugging tasks that benefit from deeper deliberation."

93codex -m gpt-5.2221 collapsible

94 222 data={{

95Copy command223 features: [

96 224 {

97Show details225 title: "Capability",

98 226 value: "",

99![gpt-5.1-codex-max](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.1-codex-max.jpg)227 icons: [

100 228 "openai.SparklesFilled",

101gpt-5.1-codex-max229 "openai.SparklesFilled",

102 230 "openai.SparklesFilled",

103Optimized for long-horizon, agentic coding tasks in Codex.231 "openai.SparklesFilled",

104 232 ],

105codex -m gpt-5.1-codex-max233 },

106 234 {

107Copy command235 title: "Speed",

108 236 value: "",

109Show details237 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

110 238 },

111![gpt-5.1](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.1.jpg)239 {

112 240 title: "Codex CLI & SDK",

113gpt-5.1241 value: true,

114 242 },

115Great for coding and agentic tasks across domains. Succeeded by GPT-5.2.243 { title: "Codex app & IDE extension", value: true },

116 244 {

117codex -m gpt-5.1245 title: "Codex Cloud",

118 246 value: false,

119Copy command247 },

120 248 { title: "ChatGPT Credits", value: true },

121Show details249 { title: "API Access", value: true },

122 250 ],

123![gpt-5.1-codex](https://cdn.openai.com/API/docs/images/model-page/model-art/gpt-5.1-codex.jpg)251 }}

124 252/>

125gpt-5.1-codex253 

126 254 </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

170 255 

171## Other models256## Other models

172 257 

173Codex works best with the models listed above.258When you sign in with ChatGPT, Codex works best with the models listed above.

174 259 

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.260You 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.

176 261 

183 268 

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.269The 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.

185 270 

271```toml

272model = "gpt-5.5"

186```273```

187model = "gpt-5.2"274 

188```275If `gpt-5.5` isn't available in your account yet, use `gpt-5.4`.

189 276 

190### Choosing a different local model temporarily277### Choosing a different local model temporarily

191 278 

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:281To 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:

195 282 

196```bash283```bash

197codex -m gpt-5.3-codex284codex -m gpt-5.5

198```285```

199 286 

200### Choosing your model for cloud tasks287### Choosing your model for cloud tasks