Today, we launchedGPT-5.3-Codex, our most capable agentic coding model yet. This model is the first that combines Codex + GPT-5 training stacks -- bringing together best-in-class code generation, reasoning, and general-purpose intelligence in one unified model. It’s ~25% faster,sets new highs on key benchmarks, and marks a step-change from code generation to ageneral-purpose coding agentyou can actively steer while it works.Read more.