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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...

Capabilities:

Input
  • Text input
  • Image input (vision)
  • File input (PDF)
  • Audio input
  • Video input
Output
  • Text output
  • Image output
  • Audio output
Pricing & availability:

  • OpenRouterOpenRouter

    $1.25 / $10 per M
Sources:
OpenRouterOpenRouter
Share:
Details:

  • OpenAIProvider

    OpenAI

  • Context window

    400K

  • Input price

    $1.25/M

  • Output price

    $10/M

  • Open weights

    No

  • Released

    Dec 2025