OpenAI: GPT-5.1-Codex-Maxopenai
Bottom Line
OpenAI: GPT-5.1-Codex-Max: $1.25/1M input, $10.00/1M output, 400K context. 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...
API Pricing (per 1M tokens)
| Input | $1.25 |
| Output | $10.00 |
| Cache Read | — |
| Cache Write | — |
| Blended (3:1) | $3.44 |
Specs & Performance
| Context Length | 400K |
| Max Output | 128K |
| Intelligence | — |
| Coding | — |
| Math | — |
| Speed | — |
| TTFT | — |
| CPS Grade | — |
| Input / Output Modalities | text, image → text |
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FAQ
How much does the OpenAI: GPT-5.1-Codex-Max API cost?
OpenAI: GPT-5.1-Codex-Max costs $1.25/1M input tokens and $10.00/1M output tokens. Blended cost at a 3:1 ratio is about $3.44/1M tokens.
What is the context window of OpenAI: GPT-5.1-Codex-Max?
OpenAI: GPT-5.1-Codex-Max supports a 400K token context window with up to 128K output tokens.
Is OpenAI: GPT-5.1-Codex-Max worth it?
OpenAI: GPT-5.1-Codex-Max has a CPS grade of — (score —), intelligence index —, coding index —. Use the compare page to benchmark against rivals.