$1.25/M input tokens$10/M output tokens$10/K web search
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic workflows spanning software engineering, mathematics, and research.
GPT-5.1-Codex-Max delivers faster performance, improved reasoning, and higher token efficiency across the development lifecycle.
OpenAI: GPT-5.1-Codex-Max – Recent Activity and Usage Stats | OpenRouter
Recent activity on GPT-5.1-Codex-Max
Total usage per day on OpenRouter
Prompt
43.8M
Reasoning
534K
Completion
402K
Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.