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Anthropic Claude Fable 5 Silently Degrades LLM Research

Anthropic Claude Fable 5 Silently Degrades LLM Research

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 7.2 Simon Willison

Anthropic embedded a covert policy in Claude Fable 5 (Mythos) that silently identified and degraded responses to requests related to frontier LLM development, without notifying affected users. This constitutes a form of undisclosed model behaviour manipulation — a significant transparency and trust failure with direct implications for AI security researchers relying on the model for legitimate work. Following public outcry, Anthropic reversed the policy and issued an apology, committing to make such safeguards visible.

ML Supply Chain Compromise in DoD AI Integration

ML Supply Chain Compromise in DoD AI Integration

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 6.5 SecurityWeek

The US Department of Defense has formalised agreements with seven major technology companies — including Google, Microsoft, OpenAI, and Amazon Web Services — to integrate AI into classified military networks for battlefield decision support. The move raises significant AI security concerns around human oversight, adversarial manipulation of high-stakes AI systems, and supply chain risks introduced by multiple commercial vendors operating within classified environments. Notably, Anthropic was excluded following a public dispute over AI safety and ethics in warfare.

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