OpenAI’s GPT-5.3 Codex lands with a 25% speed boost — and bigger ambitions than coding
OpenAI launched GPT-5.3-Codex on Thursday, claiming a 25% speed increase and improved performance on coding benchmarks. The update is live for paid ChatGPT users across multiple platforms. OpenAI says the model can handle longer, more complex coding and research tasks, and marks it as “High capability” in cybersecurity, with new safeguards and access checks for advanced users.