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Claude Mythos 5: Hold or Unleash?

Anthropic's decision to restrict Claude Mythos Preview—reportedly capable of autonomously discovering thousands of zero-day vulnerabilities—establishes a concrete precedent for its RSP, but the policy itself is contested: GovAI finds RSP v3.0 weakened prior safety commitments while Anthropic's leadership treats it as a binding cultural cornerstone. The central empirical tension is unresolved: safety-oriented holds appear to have strengthened Anthropic's enterprise position so far, but McKinsey data suggests early movers capture 2.5x market-share gains, and heterodox critics argue that extended holds create capability overhang, centralize gatekeeper power, and delay the real-world feedback needed to actually improve safety. Critically, the briefing cannot verify its own core factual claims—the Qwen source flatly denies that "Claude Mythos," "Opus 5," and "GPT-6" exist as described—leaving the entire capability narrative unconfirmed by independent or peer-reviewed sources.

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