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GPT 5.3 Codex Timeline - Announcements & Release History | AI Stats

GPT 5.3 Codex

GPT 5.3 Codex

GPT 5.3 Codex

OpenAI

Overview Timeline Benchmarks Providers Quickstart Performance

Model Timeline

12 Feb 2026

GPT 5.3 Codex Spark

Future version

05 Feb 2026

Model Released

Model first made available to the public

05 Feb 2026

Model Announced

Model first introduced to the public

18 Dec 2025

Previous version