openai

OpenAI: GPT-5.1-Codex-Max

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...

Input Cost
$1.25
per 1M tokens
Output Cost
$10.00
per 1M tokens
Context Window
400,000
tokens
Compare vs GPT-4o
Developer ID: openai/gpt-5.1-codex-max

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