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GPT-5.3 Codex

Made by: OpenAI
Country: United States
Released: 5 Feb 2026

Scores

GPT-5.3 Codex benchmark scores
Benchmark	Score	Source
Epoch Capabilities Index	156.77	Epoch AI, Epoch Capabilities Index

AGI Meridian

Model scores: Epoch AI, CC BY 4.0. All other content: all rights reserved.

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