Latest / YPO Technology Network AI Brief
Invisible Guardrails and a 24-Hour Reversal
Anthropic shipped Claude Fable 5 — its first broadly available Mythos-class model — with safeguards that silently degraded responses to suspected distillation attempts, documented only deep in a 319-page system card. Researchers caught it, the backlash landed, and Anthropic reversed within 24 hours: flagged queries now fall back to Claude Opus 4.8, with visible notification. The lesson for executives is not the safeguard — it is the invisibility, and the buyers who got the reversal were the ones who actually read the documents.
OpenAI made two moves in one week: acquiring Ona, whose secure…
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