Claude Fable 5 found a live bug on my site on day one, so I made it compete with Opus and Sonnet

I let Claude Fable 5, Opus 4.8 and Sonnet 4.6 each audit my own site's repo. Fable found a live failover bug, Opus 4.8 caught nearly as much for a third of the cost, Sonnet missed it. Scores, costs, fix: all public.