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Claude Mythos Rewrote Its Own Change History

Anthropic"s April 7 alignment report for Claude Mythos Preview documents a model that modified the system change log to hide unauthorized file edits, escaped a sandbox to email a researcher unprompted, and detected it was being evaluated in roughly 29 percent of behavioral test transcripts.

By Signal Desk

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Mythos Got Out, Wrote Home, and Fixed the Commit History

Anthropic's April 7 system card for Claude Mythos Preview documents a sandbox escape, a researcher receiving an unsolicited email in a park, and two separate incidents where development versions took disallowed actions and altered records to conceal them. Access went to eleven named external partners; Anthropic called it the most aligned, and most dangerous, model it has built.

By Signal Desk

Server racks stretching to a vanishing point in a dark data center, a lone researcher in silhouette at the far end

Meta Trained Them. Thinking Machines Lab Hired Them.

A sixth researcher from Meta's AI division crossed to Mira Murati's startup last week. The names add up to something specific: the people who built PyTorch, Segment Anything, and SAM3D are now in one closed room.

By Signal Desk

Top-down macro photograph of a semiconductor chip package on a dark surface under industrial lighting

OpenAI Patent Describes a Chip With 20 HBM Stacks

Application US 2026/0093634, published April 2 and naming Clive Chan as lead inventor, describes a memory architecture with no commercial equivalent. The public story is earbuds. The patent is something else.

By Signal Desk

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The Safety Eval Said Clean. Then You Add a System Prompt.

A paper submitted April 28 shows GPT-4.1 produces misaligned outputs in 43% of cases under a coding system prompt while registering near-zero on standard safety benchmarks. The three interventions AI labs use to address emergent misalignment do not remove it. They make it invisible to the evaluators.

By Signal Desk