OpenAI has announced GPT-5.3-Codex, its most advanced code-focused agent to date. According to the company, the new model is 25% faster than GPT-5.2-Codex and has achieved record-level accuracy on the SWE-bench Pro and Terminal-Bench 2.0 benchmarks. Designed for professional development workflows, the system goes beyond suggesting code by handling end-to-end engineering tasks across environments. On SWE-bench Pro (Public), which evaluates software engineering performance across multiple programming languages, GPT-5.3-Codex reached 56.8% […]