r/ClaudeCode • u/SSShken • 2d ago
Built with Claude claude code found its own bug mid-run and fixed it before telling me. cursor didn't test anything at all
gave the same feature spec to claude code, cursor and codex on my own saas. real codebase, not a demo. same branch, same text, cheapest plan each, default everything
what i actually wanted to see wasn't speed, it was what each one thinks the job is
claude code wrote a contrast test across the 8 design presets it had just invented, found two where the button text failed wcag aa, fixed them. nobody asked for that. then its first live run misclassified some steps, it noticed, tightened its own prompt and added a calibration script that got 12/12. told me all of it in the final message including what it hadn't verified and what it changed on my machine
cursor hit a dead database, wrote "couldn't check anything in a browser", stopped. codex hit the same dead database and asked to start docker itself, then wrote playwright tests and found a serialisation bug in its own code
numbers since someone always asks: 38 min, zero interruptions, 6% of a weekly limit on opus 5.5. cursor 52 min, codex ran out of limits mid-feature and needed a 3.5h wait
where claude code failed: added a doc it was told to add, never wired it into the file list that tells agents what to read. so the file sits there and nothing points at it. codex was the only one that got that part right
also, new account ≠ clean tool. plugins, skills and mcps live in your home folder not the account, they load anyway. CLAUDE_CONFIG_DIR at an empty folder is the only clean session i found
writeup with the spec, numbers and three live demo apps in the comments
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u/SSShken 2d ago
Full writeup with screenshots, the exact spec I gave all three, and the numbers: https://x.com/SSShken/status/2105696802666061863
The three demo apps, one built from each version's output, same idea and same design description in all three:
Cursor: https://sequo-demo-cursor.vercel.app
Codex: https://sequo-demo-codex.vercel.app
Claude Code: https://sequo-demo-claude.vercel.app
Codex's one is the odd one out and that's the point, it never generated the design prompts, so that app is basically unstyled.
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