GPT-5.3-Codex
About
An autonomous coding agent that works for hours on complex projects. You can interact with it in real time while it codes, tests, and deploys your applications. It outperforms all models on SWE-Bench Pro and Terminal-Bench 2.0 while being 25% faster
Details
GPT-5.3-Codex is an advanced autonomous coding agent designed as a SaaS platform that handles complex software development projects over extended periods, working for hours without constant supervision. Users can provide initial instructions via text prompts, and the agent independently generates code, runs tests, and deploys applications while allowing real-time interaction for guidance, adjustments, or queries. This makes it ideal for developers, engineering teams, and solo creators seeking to accelerate development workflows without traditional IDE constraints.