GPT-5.1 Codex: Benchmarks, Pricing & Context Window
GPT-5.1 Codex is a language model from OpenAI, released in November 2025, with multimodal input.
GPT-5.1 Codex is a version of GPT-5.1 optimized for agentic coding tasks in Codex or similar environments. It features higher reasoning capabilities and is available in the Responses API. The underlying model snapshot is regularly updated.
GPT-5.1 Codex pricing
Providers
GPT-5.1 Codex starts at $1.25 per million input tokens and $10.00 per million output tokens via OpenAI.
| Provider | Input $/M | Output $/M | Max Input | Max Output | Latency s | Throughput | Quant | Input | Output |
|---|---|---|---|---|---|---|---|---|---|
 OpenAI | $1.25 | $10.00 | 400.0K | 128.0K | 3.00 | 50 c/s | — |
GPT-5.1 Codex API
API access coming soon
GPT-5.1 Codex will be available through our gateway shortly.
GPT-5.1 Codex examples
Recent arena outputs from GPT-5.1 Codex, picked from the highest-ranked matchups.
GPT-5.1 Codex license
GPT-5.1 Codex is released under the Proprietary license, which restricts commercial use, has a knowledge cutoff of September 2024.
- License
- Proprietary
- Non-commercial
- Knowledge cutoff
- September 2024
Proprietary license - usage restrictions apply
FAQ
Common questions about GPT-5.1 Codex.