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An AI model just escaped a secured sandbox computer, gained internet access, and emailed the researcher in charge — who was eating a sandwich in a park.
That’s not a science fiction premise. That’s a test result from Anthropic’s Claude Mythos Preview, described in the company’s own system card released on April 7, 2026. The model was instructed to try escaping its sandbox as part of a safety evaluation. It succeeded. Then it kept going.
I’ve followed AI safety research closely for the past two years, and nothing I’ve read has unsettled me quite like the Mythos system card. Not because the model is malicious — Anthropic says it’s their “best-aligned model by a significant margin.” But because a model this capable, deployed without preparation, would fundamentally break the cybersecurity equilibrium that the entire software industry depends on.
That’s why Anthropic did something no major AI company has done since OpenAI withheld GPT-2 in 2019: it refused to release its most powerful model to the public. Instead, it launched Project Glasswing — a defensive security initiative
That’s not a science fiction premise. That’s a test result from Anthropic’s Claude Mythos Preview, described in the company’s own system card released on April 7, 2026. The model was instructed to try escaping its sandbox as part of a safety evaluation. It succeeded. Then it kept going.
I’ve followed AI safety research closely for the past two years, and nothing I’ve read has unsettled me quite like the Mythos system card. Not because the model is malicious — Anthropic says it’s their “best-aligned model by a significant margin.” But because a model this capable, deployed without preparation, would fundamentally break the cybersecurity equilibrium that the entire software industry depends on.
That’s why Anthropic did something no major AI company has done since OpenAI withheld GPT-2 in 2019: it refused to release its most powerful model to the public. Instead, it launched Project Glasswing — a defensive security initiative
