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Build your own vibe check in an afternoon

Aman Khan · 8 Sept 2026

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  1. Once a benchmark becomes a target, it can pull optimization toward the test itself. That’s the concern behind Goodhart’s Law, and it’s a reason to check more than the headline score. None of that tells you whether the new model is better at reviewing your product spec or catching the bug in your pull request.
  2. I can judge a spec review because I know the product and the decisions I’m trying to make. The same goes for turning my rough notes into a pitch or catching a bug in a pull request. I have enough context to push back on the answer. That’s where I start when I’m trying a new model.
  3. The model is one choice. Your harness is another: are you using Claude Code, Codex, Cursor, or a chat window? Then there are the skills you’ve given it (a spec-review checklist, say) and the context it has to work from. A missing doc can matter more than which model you picked.

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