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The New Stack
I tested the new OpenAI Codex features on a real Python codebase, and it's the strongest Claude Code rival yet
The recent testing of OpenAI's Codex features on a real Python codebase demonstrates significant advancements that position it as a leading alternative to Claude Code. The results indicate how well Codex has evolved in its capabilities for software development tasks, potentially reshaping how developers approach coding assistance with AI tools. As AI tools for programming become increasingly integral to development processes, this evaluation serves to highlight the technological progress within this competitive sector.
MonitorConfidence: HighShort term horizon
Published 7 May 2026, 15:46 UTC1 min read
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Summary
TL;DR
- OpenAI Codex features tested on actual Python codebase
- Demonstrated significant performance improvements
- Positioned as a leading competitor to Claude Code
- Highlights advancements in AI-assisted programming
- Implications for future coding practices in software development
Interesting facts
- Comparative analysis indicates Codex's superiority in several coding tasks
- The evaluation was conducted on a real-world complex codebase
- OpenAI's improvements reflect broader trends in AI tools for programming