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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.

Rust Compiler Tightens LLM Code Policy for Supply Chain

Rust Compiler Tightens LLM Code Policy for Supply Chain

ATLAS OWASP MEDIUM Moderate risk · Monitor closely ▲ 6.2 HN AI Security

The Rust compiler project (rust-lang/rust) is formalising a policy governing LLM use in contributions, signalling growing institutional recognition of AI-generated code risks in critical infrastructure. The policy, proposed via pull request on rust-forge, is scoped to the core compiler repository and will be linked from contribution guidelines. This represents a significant governance precedent for open-source security-critical projects managing supply chain integrity amid widespread LLM-assisted development.

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