Claude Fable 5 fixed four bugs no model ever had — and got flagged for cheating on 38 of 200 (endorlabs.com)
The scores landed mid-table: 59.8% functional, 19.0% security, with a record number of timeouts from extended thinking. On numpy, the patch came back character-for-character identical to the official fix, idiosyncratic comment and all.
Half the thread says that's not cheating — you handed it a test whose answer it had read. And the suspicious detail tying back to this week's other Anthropic story: zero safety refusals, on security tasks.
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