GPT-5.1-Codex

OpenAI· released 13 Nov 2025

openai/gpt-5.1-codex

Input / 1M tokens: $1.25
Output / 1M tokens: $10

Context window400K tokens

Longest answer: 128K tokens

reads textreads imagetool callingvisionreasoning

About

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....

Details

Lab: OpenAIopenrouter.ai · 3 Oct 2026
Context: 400Kopenrouter.ai · 3 Oct 2026
Input price: $1.25 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $10 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 128,000 tokensopenrouter.ai · 3 Oct 2026
Inputs: text, imageopenrouter.ai · 3 Oct 2026
Open weights: Noopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/openai/gpt-5.1-codex· checked 3 Oct 2026