OpenAI has introduced significant upgrades to Codex, making it faster and more reliable for developers. The new GPT-5-Codex is optimized for real-world coding tasks, enhancing collaboration and code review capabilities while integrating seamlessly with various development environments.

Writing code is straightforward, but reading and understanding it is significantly more challenging due to the need to build a comprehensive mental model of the system. This process involves navigating various components of the codebase and contextualizing functionality, which is often time-consuming and complex. The true bottleneck in software development lies in understanding rather than writing, highlighting the limitations of AI in generating code without facilitating comprehension.