OpenAI releases GPT-5.3-Codex with 25% speed boost and expanded capabilities
OpenAI has launched GPT-5.3-Codex, a coding model that the company describes as its most capable agentic coding tool to date. The model runs 25% faster than its predecessor and combines advanced coding performance with reasoning capabilities in a single system. According to OpenAI, GPT-5.3-Codex marks a significant milestone as the first model that helped create …