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Agentic coding model combining Codex and GPT‑5 training for faster, reasoning-rich code generation and interactive developer collaboration.

Agentic coding model combining Codex and GPT‑5 training for faster, reasoning-rich code generation and interactive developer collaboration.
GPT-5.3-Codex is OpenAI’s agentic coding model that blends Codex-native code generation with GPT-5 general reasoning to support long-horizon, real-world software engineering tasks. It runs approximately 25% faster for Codex users, delivers more frequent progress updates, responds to steering in real time, and improves collaboration while an agent is executing multi-step coding workflows. The model raises capabilities in large-scale code transformation, professional knowledge, and cybersecurity evaluation, and is available across Codex surfaces (Codex app, CLI, IDE extensions, and web) for paid ChatGPT subscribers while API access is being rolled out.



