OpenAI releases GPT-5.3-Codex, marking AI's entry into recursive self-improvement era. The model debugged its own training and accelerated development.

OpenAI launches GPT-5.3 Codex, the first AI model instrumental in its own creation, running 25% faster than predecessors and achieving state-of-the-art performance on SWE-Bench Pro while marking AI's entry into recursive self-improvement era.

OpenAI releases GPT-5.3-Codex, the first AI model that helped build itself, marking a breakthrough in recursive self-improvement and AI development.