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GPT-5.1-Codex

by OpenAI

GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, indepe

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GPT-5.1-Codex

Added 10 July 2026

#openai

Overview

GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

How to use / API access

Call via OpenRouter with model id `openai/gpt-5.1-codex`.

  • openrouter · openai/gpt-5.1-codex Docs

OpenRouter id: openai/gpt-5.1-codex

Benchmarks

  • Design Arena fullstack (other) : 1084 elo · #26
  • Design Arena mobileapps (other) : 1196 elo · #15
  • Design Arena webapps (other) : 1083 elo · #27
  • Design Arena codecategories (other) : 1194 elo · #54

Notes

GPT-5.1-Codex is listed in the EDNA Models directory from the OpenRouter catalogue.

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