openai/gpt-5.1-codex-miniGPT-5.1-Codex-mini is OpenAI’s proprietary AI model, released Nov 12, 2025. It costs $0.25/M input and $2/M output tokens, and handles a 400K-token context window.
GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex
Scores on standardized evaluations. Higher is better — and rank shows where GPT-5.1-Codex-mini lands among all models tracked on Model Beat.
Graduate-level scientific reasoning
Frontier of human expert knowledge
Broad expert knowledge
Contamination-free coding
Scientific research coding
Human-rated web development
Olympiad-qualifier math
Command-line agentic tasks
Tool-agent-user reliability
GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex
GPT-5.1-Codex-mini is an AI model developed by OpenAI, part of the GPT family, released Nov 12, 2025.
GPT-5.1-Codex-mini is served from $0.25 per million input tokens and $2 per million output tokens (cheapest credible provider on OpenRouter: OpenAI).
GPT-5.1-Codex-mini supports a context window of up to 400K tokens.
On standardized evaluations tracked by Epoch AI, GPT-5.1-Codex-mini scores 83.6% on LiveCodeBench, 61.6% on Terminal-Bench, 91.7% on AIME 2024/2025.
GPT-5.1-Codex-mini is a proprietary model (API access), available through its provider's API rather than as a downloadable open-weight model.
Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Sep 17, 2026.