GPT-5.3-Codex

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openai/gpt-5.3-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: 2026-02-05

Max output: 128K
Knowledge cutoff: 2025-08-31
Weights: Closed
Capabilities: Attachments, Reasoning, Structured, Tool call

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Batch processing

Performance


SWE-Atlas Test Writing	Coding	Scale AI	—
SWE-Atlas Refactoring	Coding	Scale AI	—
SWE-Atlas Codebase QnA	Coding	Scale AI	—
CritPt（Artificial Analysis）	Reasoning	Artificial Analysis	—
AA-LCR（Artificial Analysis）	Knowledge	Artificial Analysis	—
Humanity’s Last Exam（Artificial Analysis）	Reasoning	Artificial Analysis	—
IFBench（Artificial Analysis）	Knowledge	Artificial Analysis	—
AA-Briefcase	Professional	Artificial Analysis	—

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ModelRegistry · Catalog updated 2026-11-05