GPT-5.1-Codex-Max
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...
GPT-5.1-Codex-Max ranks #294 of 348 models in the default AI Benchmark Hub order (quality first, then cost). At $5.63 blended per million tokens, it is cheaper than 17% of models with published API pricing. Its 400,000-token context window is 1.5× the catalog median (262,144 tokens).
Context
Max output: 128000
Pricing
Output / 1M: 10.00
Blend / 1M: 5.63
Quality
Provider
Moderated: no
Monthly cost at this blended rate
Estimated API spend if every token is billed at $5.63per million (the blend of this model's input and output prices). Real bills depend on the input/output mix.
| Tokens / month | Est. cost (USD) |
|---|---|
| 1,000,000 | $5.63 |
| 10,000,000 | $56.25 |
| 100,000,000 | $562.50 |
Related models
Same lab, similar price, or similar quality — useful next comparisons.
More from OpenAI
- GPT-5.5$17.50 / 1M · Q 80.4
- GPT-5.4$8.75 / 1M · Q 79.3
- GPT-5.2 Chat$7.88 / 1M · Q 75.2
- GPT-5.2$7.88 / 1M · Q 75.2
- GPT-5.1$5.63 / 1M · Q 75.0
Closest API price
- Gemini 2.5 Pro$5.63 / 1M · Q 76.2
- Gemini 2.5 Pro Preview 06-05$5.63 / 1M · Q 76.2
- GPT-5.1$5.63 / 1M · Q 75.0
- GPT-5.1-Codex$5.63 / 1M
- GPT-5$5.63 / 1M