Codex Digs Up Bugs in SymPy
ErnestRyu · x · 2026-07-14
Finding Bugs in SymPy Using Codex
Ernest Ryu introduces an "agentic bug hunt" project: his UCLA PhD student used Codex + GPT-5.6 to find many "surprisingly simple" failure cases and bugs in the math library SymPy.
Core Takeaways
- SymPy is a core mathematical infrastructure project widely considered to be battle-tested.
- This work demonstrates that coding agents like Codex can still uncover obvious but real issues even in mature codebases.
- The conclusion leans heavily towards "agents are viable for real-world bug discovery/code auditing," rather than just writing demos.
Related event: Codex Uncovers Subtle Correctness Bugs in SymPy(3 posts)→
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