News Story
Introducing GPT-5.3-Codex
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Ordered by publication time. The first one is marked first; anything flagged near-identical shares almost the same wording, which usually means the same press release rather than separate reporting. That is a measurement — a SimHash distance of at most 10 on the headline and excerpt — not an accusation.
Introducing GPT-5.3-Codex
GPT-5.3-Codex is a Codex-native agent that pairs frontier coding performance with general reasoning to support long-horizon, real-world technical work.
openai.com
GPT-5.3-Codex System Card
GPT‑5.3-Codex is the most capable agentic coding model to date, combining the frontier coding performance of GPT‑5.2-Codex with the reasoning and professional knowledge capabilities of GPT‑5.2.
openai.com