# GPT-5.1-Codex-Max

> GPT-5.1-Codex-Max, a family of models by OpenAI, listed from OpenRouter. Indexed, not reviewed: facts and our own checks, no score or ranking. GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is…

- Canonical: https://www.anchorterminal.com/tools/gpt-5-1-codex-max
- Markdown: https://www.anchorterminal.com/tools/gpt-5-1-codex-max.md (~500 tokens)
- Slim: https://www.anchorterminal.com/tools/gpt-5-1-codex-max.min.md (~430 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/tools/gpt-5-1-codex-max.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

# GPT-5.1-Codex-Max

> Indexed, not reviewed: facts from OpenRouter and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: model family, by OpenAI
- Category: Model APIs & inference (https://www.anchorterminal.com/categories/inference.md)
- Listed because: OpenRouter lists it, with prices from the providers that serve it.
- What OpenRouter says: GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...

## Models (1)

| Model | OpenRouter id | Released | Context | Input $/1M | Output $/1M | Supports |
| --- | --- | --- | --- | --- | --- | --- |
| GPT-5.1-Codex-Max | `openai/gpt-5.1-codex-max` | 2025-12 | 400k | $1.25 | $10 | tools, structured output, reasoning, caching, image |

Prices and limits as OpenRouter lists them; a provider's own price can differ.

- JSON: https://www.anchorterminal.com/api/v1/tools/gpt-5-1-codex-max.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming