GPT-5.1-Codex

Retired

openai/gpt-5.1-codex

Codex GPT for repository edits, code review, and practical software agents

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Context window: 400K
Input: Image · Text
Output: Text
Released: 2025-11-13

Max output: 128K
Knowledge cutoff: 2024-09-30
Weights: Closed
Capabilities: Attachments, Reasoning, Structured, Tool call

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							Cache write
OpenRouter	openai/gpt-5.1-codex	Openai chat	global				-

ModelRegistry · Catalog updated 2026-10-01