OpenAI has launched GPT-5.3-Codex, a new agentic coding model that unifies frontier code performance with professional reasoning, running 25% faster and capable of handling broad computer tasks beyond just coding. It excels in benchmarks like SWE-Bench Pro and Terminal-Bench 2.0, and demonstrates strong computer-use capabilities in OSWorld-Verified, while also matching previous models on professional knowledge tasks in GDPval.
Edward Kiledjian
@ekiledjian