OpenAI Launches GPT-5.3-Codex with 25% Faster Speed and First 'High' Cybersecurity Rating to Challenge Anthropic's Claude
OpenAI unveils GPT-5.3-Codex with 25% faster speeds and breakthrough 'high' cybersecurity rating, expanding beyond coding to debugging, deployment, and business tasks while launching a Mac desktop app to directly challenge Anthropic's Claude dominance.