BrianOnAIOpenAI: GPT-5.1-Codex-Max
byOpenAI
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.
Pricing
Input
$1.25 / 1M tokens
Output
$10.00 / 1M tokens
Specifications
Context Window400K tokens
Max Output128K tokens
Modalitymultimodal
Input Typestext, image
Output Typestext
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