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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.
Price/1M
$3.44
571st cheapest
1009% above median
Top 85%
Context Window
400K
41st largest
Top 16%
Input
$1.25
per 1M tokens
Output
$10.00
per 1M tokens
Blended
$3.44
per 1M tokens
Cheaper than 15% of models. Median price is $0.31/1M tokens.
Daily
$3.44
Monthly
$103.13
Context Window
400K
tokens
Larger than 84% of models
Max Output
128K
tokens
32% of context
Context Window Comparison