models.md Codex Docs, 2026-03-17 00:33 UTC → 2026-05-14 07:00 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: true },

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 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.

82 212 

83## Alternative models213## Alternative models

84 214 

85![gpt-5.2-codex](/images/codex/gpt-5.2-codex.png)215<div class="not-prose grid gap-4 md:grid-cols-2 xl:grid-cols-3">

86 216<ModelDetails

87gpt-5.2-codex217 client:load

88 218 name="gpt-5.2"

89Advanced coding model for real-world engineering. Succeeded by GPT-5.3-Codex.219 slug="gpt-5.2"

90 220 description="Previous general-purpose model for coding and agentic tasks, including hard debugging tasks that benefit from deeper deliberation."

91codex -m gpt-5.2-codex221 collapsible

92 222 data={{

93Copy command223 features: [

94 224 {

95Show details225 title: "Capability",

96 226 value: "",

97![gpt-5.2](/images/api/models/gpt-5.2.jpg)227 icons: [

98 228 "openai.SparklesFilled",

99gpt-5.2229 "openai.SparklesFilled",

100 230 "openai.SparklesFilled",

101Previous general-purpose model for coding and agentic tasks across industries and domains. Succeeded by GPT-5.4.231 "openai.SparklesFilled",

102 232 ],

103codex -m gpt-5.2233 },

104 234 {

105Copy command235 title: "Speed",

106 236 value: "",

107Show details237 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

108 238 },

109![gpt-5.1-codex-max](/images/api/models/gpt-5.1-codex-max.jpg)239 {

110 240 title: "Codex CLI & SDK",

111gpt-5.1-codex-max241 value: true,

112 242 },

113Optimized for long-horizon, agentic coding tasks in Codex.243 { title: "Codex app & IDE extension", value: true },

114 244 {

115codex -m gpt-5.1-codex-max245 title: "Codex Cloud",

116 246 value: false,

117Copy command247 },

118 248 { title: "ChatGPT Credits", value: true },

119Show details249 { title: "API Access", value: true },

120 250 ],

121![gpt-5.1](/images/api/models/gpt-5.1.jpg)251 }}

122 252/>

123gpt-5.1253 

124 254 </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

180 255 

181## Other models256## Other models

182 257 

183Codex works best with the models listed above.258When you sign in with ChatGPT, Codex works best with the models listed above.

184 259 

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.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.

186 261 

193 268 

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.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.

195 270 

271```toml

272model = "gpt-5.5"

196```273```

197model = "gpt-5.4"274 

198```275If `gpt-5.5` isn't available in your account yet, use `gpt-5.4`.

199 276 

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

201 278 

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: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:

205 282 

206```bash283```bash

207codex -m gpt-5.4284codex -m gpt-5.5

208```285```

209 286 

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