Security firm Tolmo said on June 22, 2026 that Anthropic's Claude Fable 5 wrote a bootable, Windows NT-compatible kernel in Rust from an empty directory in 38 minutes, publishing a transcript-level account of the work. The project, dubbed "ntoskrnl-rs" and produced by the company's Threat Research Agent "Twinkle" together with Matt Suiche, reportedly reached a stage where it boots on the QEMU emulator and passes all 14 of its self-tests.
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