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GPT-5.1 Codex Max

Chat

OpenAI

openai/gpt-5.1-codex-max

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...

8

credits / gen

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File Support 400K Context Vision (OR)

About this model

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...

Technical Specifications

Provider

OpenAI

Type

Chat

Context Window

400,000 tokens

Pricing

8 credits

Capabilities

File Support

Can read PDF, DOCX, XLSX & more

400K Context

Large context window for long documents

Vision (OR)

OpenRouter reports vision support