Simon Willison6d ago
Wrote up some thoughts on Anthropic's Project Glasswing, where their latest Opus-beating model is available to partnered security research organizations only. Given the recent alarm bells raised by credible security voices I think this is a justified decision.
https://simonwillison.net/2026/Apr/7/project-glasswing/
Anthropic’s Project Glasswing—restricting Claude Mythos to security researchers—sounds necessary to me

Anthropic didn’t release their latest model, Claude Mythos (system card PDF), today. They have instead made it available to a very restricted set of preview partners under their newly announced …

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@simon I don't have to like it (the exclusivity), but I agree it's probably the right call. It doesn't seem like anybody has a better idea.
Apr 7 at 9:33pmWeb