GPT-5-Codex

Retired

openai/gpt-5-codex

Coding-optimized GPT model for repository edits, reviews, and agentic software work

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Context window: 400K
Input: Image · Text
Output: Text
Released: 2025-09-15

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

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Performance


Artificial Analysis Coding Index	General	Artificial Analysis	—
SciCode	Coding	SciCode	—
Terminal-Bench Hard	Coding	Artificial Analysis	—

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ModelRegistry · Catalog updated 2026-10-01