"The company says its new model, called GPT-5-Codex, spends its "thinking" time more dynamically than previous models, and could spend anywhere from a few seconds to seven hours on a coding task. As a result, it performs better on agentic coding benchmarks. The new model is now rolling out in Codex products - which can be accessed via a terminal, IDE, GitHub, or ChatGPT - to all ChatGPT Plus, Pro, Business, Edu, and Enterprise users."
"The update is part of OpenAI's effort to make Codex more competitive with other AI coding products, such as Claude Code, Anysphere's Cursor, or Microsoft's GitHub Copilot. The market for AI coding tools has become much more crowded in the last year, as a result of intense user demand. Cursor surpassed $500 million in ARR earlier in 2025 and Windsurf, a similar code editor, was the subject of a chaotic acquisition attempt that saw its team split between Google and Cognition."
"OpenAI says that GPT-5-Codex outperforms GPT-5 on SWE-bench Verified, a benchmark measuring agentic coding abilities, as well as a benchmark measuring performance on code refactoring tasks from large, established repositories. The company also says it trained GPT-5-Codex for conducting code reviews, and asked experience software engineers to evaluate the model's review comments. The engineers reportedly found GPT-5-Codex to submit fewer incorrect comments, while adding more "high-impact comments.""
OpenAI released GPT-5-Codex, a GPT-5 variant optimized for its Codex coding agent. GPT-5-Codex allocates "thinking" time dynamically, ranging from a few seconds to seven hours per task, improving agentic coding performance and code refactoring. The model is rolling out across Codex products accessible via terminal, IDE, GitHub, and ChatGPT to ChatGPT Plus, Pro, Business, Edu, and Enterprise users, with API availability planned later. GPT-5-Codex outperforms GPT-5 on SWE-bench Verified and refactoring benchmarks. The model was trained for code reviews, yielding fewer incorrect comments and more high-impact feedback from experienced software engineers. The update aims to keep Codex competitive in a crowded AI coding market.
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