Introduction
OpenAI’s GPT-5-Codex marks a major leap in AI coding tools, featuring dynamic thinking and superior performance. Already available for ChatGPT Plus, Pro, Business, Edu, and Enterprise users, this update sets new industry standards.
Context
The AI coding tools market is highly competitive, with solutions like Claude Code, Anysphere’s Cursor, and Microsoft’s GitHub Copilot. Cursor surpassed $500 million ARR in 2025, while Windsurf faced a turbulent acquisition between Google and Cognition.
Direct Definition
GPT-5-Codex is an AI coding model that dynamically adjusts processing time, improving solution quality and depth.
The Challenge
Traditional AI coding tools often rely on routers that pre-allocate resources, limiting flexibility and accuracy for complex tasks.
Solution / Approach
GPT-5-Codex overcomes these limits with dynamic thinking: it decides in real time how long to work on a task, sometimes spending up to seven hours on complex problems. This leads to better results in agentic benchmarks and refactoring tasks on large repositories.
- Superior performance on SWE-bench Verified
- More accurate and impactful review comments
- Dynamic adjustment of work time
Quote
“Much of the increased performance was thanks to GPT-5-Codex’s dynamic thinking abilities.”
Alexander Embiricos, Product Lead Codex / OpenAI
Conclusion
GPT-5-Codex is a breakthrough for AI coding, offering flexibility, precision, and more useful review comments. The update strengthens OpenAI’s position in a crowded market.
FAQ
What is GPT-5-Codex and how does it work in AI coding?
GPT-5-Codex is an AI model that adapts processing time to improve code quality.
What advantages does GPT-5-Codex offer over competitors?
It provides dynamic thinking, more precise review comments, and better agentic benchmark results.
Is GPT-5-Codex available to all users?
It’s available for ChatGPT Plus, Pro, Business, Edu, and Enterprise users; API access is coming soon.
How does GPT-5-Codex manage work time on a task?
It decides in real time how long to work, up to seven hours for complex problems.
What are the limitations of GPT-5-Codex in AI coding?
API availability is limited, and the model may require long processing times for complex tasks.
Does GPT-5-Codex improve code review?
Yes, it produces fewer incorrect comments and more high-impact suggestions.
Which companies compete with OpenAI in AI coding?
Claude Code, Anysphere’s Cursor, GitHub Copilot, and Windsurf are key competitors.
Is GPT-5-Codex suitable for large repositories?
Yes, it has been tested on large repository refactoring benchmarks.