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OpenAI · model passport

OpenAI: GPT-5.1-Codex-Max

gpt-5-1-codex-max
  • 400,000 context
0/27axes covered

How to run it

Use it hosted

API model IDopenai/gpt-5.1-codex-max
Context length400,000 tokens
Max output128,000 tokens
Acceptstext, image
Input price$1.25 per 1M tokens
Cached input price$0.13 per 1M tokens
Output price$10 per 1M tokens

API parameters this endpoint supports

Include reasoningMax completion tokensReasoningReasoning effortResponse formatSeedStructured outputsTool choiceTool callingVerbosity

Example request

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-5.1-codex-max","messages":[{"role":"user","content":"Hello"}]}'

View on OpenRouter →

Identifiers, limits and prices are synced from the upstream source shown above. Any field we haven't synced is left out entirely rather than guessed.

No benchmark we track has published a result for this model yet, so there is no score card — only the run guide above. It will appear here once any board we ingest scores it.

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