OpenAI: GPT-5.1-Codex-Max — pricing & benchmarks

By openai · Updated 2026-10-06 · Reads imagesreads images / documentsstep-by-step reasoning

What OpenAI: GPT-5.1-Codex-Max is used for

OpenAI: GPT-5.1-Codex-Max is best suited for reads images / documents, step-by-step reasoning. Access it through one Appmo API key alongside 458 other models — Appmo's optimizer can route to it automatically when it is the best value for a request.

Use it via the Appmo API (OpenAI-compatible)

curl https://appmo.com/v1/chat/completions \
  -H "Authorization: Bearer $APPMO_KEY" \
  -d '{"model":"openai/gpt-5.1-codex-max","messages":[{"role":"user","content":"Hello"}]}'

FAQ

How much does OpenAI: GPT-5.1-Codex-Max cost?
OpenAI: GPT-5.1-Codex-Max costs $1.25 per 1M input tokens and $10 per 1M output tokens ($3.438 blended), as of 2026-10-06. Prices are expected to fall as competition increases.

What is OpenAI: GPT-5.1-Codex-Max best for?
OpenAI: GPT-5.1-Codex-Max is best suited for reads images / documents, step-by-step reasoning.

How do I use OpenAI: GPT-5.1-Codex-Max?
Send requests to Appmo's OpenAI-compatible endpoint with model id "openai/gpt-5.1-codex-max" and one API key — no separate provider account needed.

Is OpenAI: GPT-5.1-Codex-Max open source?
We have no record of public weights for OpenAI: GPT-5.1-Codex-Max; treat it as a closed model available only through its provider's API.

Can OpenAI: GPT-5.1-Codex-Max create images?
No. OpenAI: GPT-5.1-Codex-Max can read and understand images, but it only writes text.