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....
OpenAI: GPT-5.1-Codex — OpenAI. Context window 400,000 tokens. API pricing (per 1M tokens): Input $1.25, Output $10. License: Proprietary.
| Provider | OpenAI |
|---|---|
| API model ID | openai/gpt-5.1-codex |
| Tier | Frontier |
| Context window | 400,000 tokens |
| Max output | 128,000 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $1.25 |
| API pricing (per 1M tokens) · Output | $10 |