OpenAI model

GPT-5.1 Codex Max

GPT-5.1 Codex Max is a OpenAI model listed in the NextModel catalogue for image understanding, multimodal chat workloads. Its listed price is $1.25 / 1M tokens input and $10 / 1M tokens output, with a 400k token context window.

Read quickstartEstimate cost
OpenAIPlatform curatedCatalog
ThinkingFunction CallingVision
Input price$1.25 / 1M tokens
Output price$10 / 1M tokens
Context length400k tokens
Max output8.2k tokens

What is GPT-5.1 Codex Max in NextModel?

GPT-5.1 Codex Max is a OpenAI model listed in the NextModel catalogue for image understanding, multimodal chat workloads. Its listed price is $1.25 / 1M tokens input and $10 / 1M tokens output, with a 400k token context window.

GPT-5.1 Codex Max via NextModel: 400k-token context; $1.25 / 1M tokens in / $10 / 1M tokens out per 1M tokens. Capabilities: streaming, tool, json.

Best use cases

  • image understanding
  • multimodal chat

OpenAI-compatible code example

request.sh
curl https://api.nextmodel.app/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $NEXTMODEL_API_KEY" \
  -d '{"model":"openai/gpt-5.1-codex-max","messages":[{"role":"user","content":"Reply with OK."}]}'

Switching models only changes the model field.

Try it in the playground

Similar alternatives

OpenAICatalogHealthytypical

GPT-5.2

GPT-5.2 via NextModel: 400k-token context; $1.75 / 1M tokens in / $14 / 1M tokens out per 1M tokens. Capabilities: streaming, tool, json.

$1.75 / 1M tokensInput$14 / 1M tokensOutput400kContext
Best forimage understanding, multimodal chat
StreamingTool callingJSON modeVision
Platform curatedCurated and maintained in the NextModel catalog
View details
OpenAICatalogHealthytypical

GPT-5.1

GPT-5.1 via NextModel: 400k-token context; $1.25 / 1M tokens in / $10 / 1M tokens out per 1M tokens. Capabilities: streaming, tool, json.

$1.25 / 1M tokensInput$10 / 1M tokensOutput400kContext
Best forimage understanding, multimodal chat
StreamingTool callingJSON modeVision
Platform curatedCurated and maintained in the NextModel catalog
View details
OpenAICatalogHealthytypical

GPT-5.1 Codex

GPT-5.1 Codex via NextModel: 400k-token context; $1.25 / 1M tokens in / $10 / 1M tokens out per 1M tokens. Capabilities: streaming, tool, json.

$1.25 / 1M tokensInput$10 / 1M tokensOutput400kContext
Best forimage understanding, multimodal chat
StreamingTool callingJSON modeVision
Platform curatedCurated and maintained in the NextModel catalog
View details

Compare GPT-5.1 Codex Max

GPT-5.1 Codex Max vs GPT-5.2GPT-5.1 Codex Max vs GPT-5.1GPT-5.1 Codex Max vs GPT-5.1 CodexGPT-5.1 Codex Max vs GPT-5.1 Codex MiniGPT-5.1 Codex Max vs GPT-5.2 Codex

Reading

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FAQ

GPT-5.1 Codex Max API questions

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