OpenAI releases GPT-5.3-Codex, 25% faster agentic coding model assisting debugging

Technology Oct 07, 2026

OpenAI has rolled out GPT-5.3-Codex, calling it its "most capable agentic coding model yet released."

It's not just faster, 25% speedier than before, but also smart enough to help debug and even to have taken part in its own development.

Plus, it now supports more than just coding, lending a hand with project documents and spotting software vulnerabilities for better cybersecurity.

OpenAI expands access, backs cyber research

There's a fresh Mac app that keeps things running smoothly even during long tasks, making life easier for users.

OpenAI is also backing cybersecurity research with $10 million in API credits and launching the Trusted Access for Cyber program.

For now, GPT-5.3-Codex is available to paid ChatGPT users, with API access is planned.