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GPT-5-Codex, a specialized coding version of GPT-5, outperforms the base model on code refactoring tasks (51.3 percent vs. 33.9 percent) and can work independently for over 7 hours on complex projects. The model adapts its thinking time to match task difficulty; it responds quickly to simple requests but takes much longer on challenging problems, catching more critical bugs during code reviews. OpenAI also rebuilt its Codex tools with new features like image attachments in the command line, a VS Code extension that syncs between local and cloud work, and infrastructure improvements that cut task completion times by 90 percent. These updates position Codex competitively against Claude Code and other agentic assistants and model scaffolds in the semi-autonomous coding market. Codex comes with all paid ChatGPT plans, with API access planned for the near future. (OpenAI)