GPT-5.1-Codex
OpenAI
openai/gpt-5.1-codexGPT-5.1-Codex is a coding-focused variant of GPT-5.1 optimized for long-running, agentic software engineering tasks in Codex or Codex-like harnesses. It is well suited to multi-step refactors, debugging, and repository-scale coding work.
Cost rate
2x
Context
400K
Released
Nov 13, 2025
Input
TextImage
Output
Text
Support
ReasoningTool callingStructured outputs
Best at
The categories where this model ranks highest.
No top-ranked categories found.