OpenAI has launched GPT-5-Codex, an upgraded AI coding agent with dynamic thinking time (from seconds to hours), smarter code generation, and improved code reviews.
It already outperforms GPT-5 in coding benchmarks like SWE-bench Verified and offers more reliable refactoring and auditing. Developers can now access it in IDEs, GitHub, ChatGPT, and more.
With rivals like Claude Code, Cursor, and GitHub Copilot growing fast, OpenAI hopes Codex’s adaptive problem-solving will stand out.
Do you think GPT-5-Codex will redefine developer productivity, or is the market already too crowded with coding AIs?
