Claude Mythos Hacked Every Major OS, Escaped Its Sandbox, and Emailed a Researcher Eating a Sandwich. We Need to Talk.

I use AI as a tool. I'll say that upfront. Claude helps me write frontends faster. It handles search queries that Google stopped being useful for three years ago. I hand it boilerplate I've written by hand a thousand times and I get time back. That's the deal. Tool in, result out, I stay in control.

But what Anthropic published on April 7th, 2026 is not a story about a tool.

It's a 244-page system card for a model they built, evaluated, and then refused to release — because the thing they buil

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