OpenAI: GPT-5.1-Codexopenai
Bottom Line
OpenAI: GPT-5.1-Codex: $1.25/1M input, $10.00/1M output, 400K context, CPS grade A. GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
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 | 24 |
| Coding | 37 |
| Math | 96 |
| Speed | — |
| TTFT | — |
| CPS Grade | A |
| Input / Output Modalities | text, image → text |
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FAQ
How much does the OpenAI: GPT-5.1-Codex API cost?
OpenAI: GPT-5.1-Codex 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?
OpenAI: GPT-5.1-Codex supports a 400K token context window with up to 128K output tokens.
Is OpenAI: GPT-5.1-Codex worth it?
OpenAI: GPT-5.1-Codex has a CPS grade of A (score 65), intelligence index 24, coding index 37. Use the compare page to benchmark against rivals.