Codex Finds Failure Cases in Mature Codebases
ErnestRyu · x · 2026-07-14
Agentic Bug Hunt in SymPy
The author adds that SymPy, as mathematical infrastructure, was thought to be highly "battle-tested." Yet, in this project, his UCLA PhD students Xinjie and Hyunsik used Codex + GPT-5.6 to find many "very simple" failure cases within it.
This reinforces a key signal: even for mature, core open-source projects, coding agents can serve as highly effective tools for real code auditing and bug discovery.
Related event: Codex Uncovers Subtle Correctness Bugs in SymPy(3 posts)→
More from coding & agent
- A tutorial shows how to rebuild Claude Code inside Pi with harness engineering — eptwts · 2026-07-21
- For agents and chatbots, the RAG vs. tuning choice depends on the problem — Roker_51 · 2026-07-21
- Reddit user asks for a practical local Ollama-and-Hermes desktop agent stack — Tonka-Jahari-Pizza · 2026-07-21
- Using Codex to set up Claude Code because opening a terminal takes one extra click — emollick · 2026-07-21
- An interactive Zarr explainer shows how AI is changing technical education — MaxLenormand · 2026-07-21
- Most people still use Claude like a chatbot, not an agent — heypearlai · 2026-07-21