GPT-5.1-Codex-Max: Pricing, Context Window & Benchmarks
by OpenAI
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 workflows spanning software engineering, mathematics, and research. GPT-5.1-Codex-Max delivers faster performance, improved reasoning, and higher token efficiency across the development lifecycle.
What you can do with GPT-5.1-Codex-Max
Everyday Q&A and clear explanations
Writing help (emails, posts, summaries)
Idea generation and brainstorming
Learning support with step-by-step guidance
Composite Indices
Intelligence, Coding, Math
Standard Benchmarks
Academic and industry benchmarks
Benchmark Highlights
| Metric | Value |
|---|---|
| Provider | OpenAI |
| Context Window | 400,000 tokens |
| Input Price | $0.25/1M tokens |
| Output Price | $2.00/1M tokens |
| Release Date | Nov 13, 2025 |
| Modalities | text, image |
| Capabilities | Vision |
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Frequently asked questions
What is GPT-5.1-Codex-Max good for?
Use GPT-5.1-Codex-Max for everyday tasks like writing, summarizing, brainstorming, and getting clear explanations.
How much does GPT-5.1-Codex-Max cost?
Pricing is based on usage. Current rates are $0.25/1M tokens for input and $2.00/1M tokens for output.
Can I try GPT-5.1-Codex-Max for free?
Yes. You can start a chat instantly and test the model before deciding on a plan.
Does GPT-5.1-Codex-Max support images or audio?
GPT-5.1-Codex-Max can understand images.
Suggested comparisons
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Benchmarks and pricing are sourced from Artificial Analysis where available. OpenRouter specs are used as a fallback.
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