> Open source models found the same bugs? Sure, if you tell them "here is a for which may contain a vulnerability, look for a big in how function XYZ handles ABC"

In one of Anthropic's blog post, they describe that that's basically what they did too. They run the agent many times, each time specifying a different file to focus on. [1]

From my experience as a security researcher, manually finding a fishy file and sicking even sonnet 4.5 yields great results for most memory corruption bugs.

No comments otherwise. I don't have a clue as to who that guy is, and I haven't watched the video yet. You might be right overall.

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

Edit: looked at the open source model claims - I agree that they suck. Basically all the details are given away in the prompt - not just the file.