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>This initiative probably could have started a few months sooner with Opus and similar models, though.

Evidently they tried and even the most recent Opus 4.6 models couldn't find much. Theres been a step change in capabilities here.



No, Opus has found a lot and 112 vulnerabilities were reported to Firefox alone by Opus [0]. But Mythos is uniquely capable of exploiting vulnerabilities, not just finding them.

[0] https://red.anthropic.com/2026/mythos-preview/


Doesn't even seem to be in the same ballpark of capability.

https://red.anthropic.com/2026/mythos-preview/FRT-Blog-Chart...




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