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GPT-5.3 Codex

OpenAI, 5 Feb 2026.

Lab

OpenAI

Released

5 Feb 2026

Kind

Language, Language modeling/generation

Training compute

Not disclosed

Parameters

Not disclosed

Capability index

156.8 (Epoch)

Organisations

OpenAI

Country

United States

See it in the 3D sky Paper or announcement

Data: Epoch AI (Creative Commons Attribution), releases too new for it from OpenRouter, and METR. Updated 25 Sep 2026.