OpenAI today announced the launch of GPT 5.3 Codex, which OpenAI claims is the most capable agentic coding model yet released. Interestingly enough, Anthropic, maker of Claude Code, is also releasing a new powerful model at exactly the same time. Anthropic's model, Opus 4.6 , is a more general purpose model, but Anthropic is well known for its Claude Code offering. Also: OpenAI's Codex just got its own Mac app and anyone can try it for free now As with Anthropic's Opus 4.6,...
