OpenAI introduces GPT-5-Codex, an improved version of its AI coding tool for developers.
OpenAI has renewed its AI coding tool Codex. The new version, powered by GPT-5-Codex, aims to better support developers in interactive coding and independently executing complex tasks. According to OpenAI, GPT-5-Codex can work more efficiently on simple tasks and takes more time for complex tasks, compared to GPT-5. GPT-5_codex is included in existing ChatGPT subscriptions.
Realistic Software Development
GPT-5-Codex is specifically trained for practical software development. The model is designed for both short interactions and long-term tasks, such as large-scale refactoring or building complete applications. According to OpenAI, GPT-5-Codex works more efficiently than GPT-5 on simple tasks, and takes more time for complex challenges. Test results show that the model can work independently for longer periods, detect errors, and implement solutions.
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The upgrade makes Codex more versatile. Developers can work with it via the terminal, an IDE, the web, or mobile through the ChatGPT app. Integration with GitHub and cloud environments ensures that work can be easily shared or moved. Codex is available to users of ChatGPT Plus, Pro, Business, Edu, and Enterprise.
Code Reviews
Codex now also supports code reviews. The model can analyze PRs, identify potential bugs, and suggest improvements. Evaluations show that GPT-5-Codex generates fewer incorrect and more impactful comments than its predecessor.
Additionally, the Codex CLI has been renewed, with better support for sharing images, an improved interface, and extended control over permissions and access. The Codex IDE extension has also been expanded, including faster results thanks to local context and the ability to manage cloud tasks directly in the IDE.
The cloud environment behind Codex received performance improvements through, among other things, container caching and automatic setup. Developers can add screenshots or frontend specifications to communicate their intentions more clearly.
Codex operates in a sandbox environment with limited network access, unless explicitly allowed. Developers remain responsible for a final check of the proposed code.
Codex is included in existing ChatGPT subscriptions. Companies with a Business or Enterprise license can purchase additional usage capacity. OpenAI also plans to make GPT-5-Codex available via an API key for use in the CLI.