GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini sits in the frontier tier, built for high-capability reasoning, tool use, and long-form output where capability outweighs cost. Available via OpenAI. 400,000-token context. Efficient pricing.
GPT-5.1-Codex-Mini is a multimodal AI model from OpenAI. It costs $0.250 per million input tokens and $2.000 per million output tokens (blended $0.775/M), with a 400,000-token context window.
- Strong general reasoning
- Tool use & function calling
- Long-form writing
- Production-grade reliability
- Multimodal: handles images alongside text
- Production assistants
- Long-document analysis
- Multi-step agent workflows
- Engineering copilots
Benchmarks
More from OpenAI
See all 28 →Frequently asked questions
How much does GPT-5.1-Codex-Mini cost?
GPT-5.1-Codex-Mini costs $0.250 per million input tokens and $2.000 per million output tokens, for a blended reference rate of $0.775 per million tokens.
What is GPT-5.1-Codex-Mini's context window?
GPT-5.1-Codex-Mini supports up to 400,000 tokens of context in a single request.
What is GPT-5.1-Codex-Mini best for?
GPT-5.1-Codex-Mini is well suited to Strong general reasoning, Tool use & function calling and Long-form writing.
Who makes GPT-5.1-Codex-Mini?
GPT-5.1-Codex-Mini is developed and served by OpenAI.