Model Details
Where is GPT-5.1 Codex Max a perfect fit?
- Multi-hour or continuous coding agents handling large projects
- Full-repo refactoring, debugging, and test-driven development
- Autonomous PR creation, review, and iteration loops
- Complex engineering workflows involving multiple tools and environments
- Large-scale system design and cross-file reasoning
- Async development (define task → model executes over hours)
Quick Model Estimate
Your GPT-5.1 Codex Max Cost Estimate
💰 Total Cost
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for 1000 input + 1000 output tokens
Cost Breakdown
At the last price OpenAI charged, before it stopped on 23rd Jul 2026. No longer on offer.
Pricing
No provider we track currently offers GPT-5.1 Codex Max.
No longer offered by
The last prices each provider charged for GPT-5.1 Codex Max before it stopped offering it. These are no longer on offer. Each row links to that provider's price history.
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Input Price
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Cached Input
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Context Size
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 OpenAI | 23rd Jul 2026Model retired | Text | Standard | $1.2500 | $10.0000 | $0.1250 | 400,000 tokens | → |
| OpenAI | 23rd Jul 2026Model retired | Text | Priority | $2.5000 | $20.0000 | $0.2500 | 400,000 tokens | → |
Recent changes
When GPT-5.1 Codex Max was newly listed on a provider, moved to legacy or deprecated, or retired.
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Retired
OpenAI retired GPT-5.1 Codex Max, with GPT-5.6 Sol as the suggested replacement.
Other Models in the GPT-5.1 Family
FAQs about GPT-5.1 Codex Max
What is GPT-5.1 Codex Max's context window?
GPT-5.1 Codex Max has a context window of 400,000 tokens, and returns up to 128,000 tokens in a single response.
Is GPT-5.1 Codex Max still available?
GPT-5.1 Codex Max is deprecated and was retired on 23 July 2026. The replacement is GPT-5.6 Sol.