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Applied AI·September 1, 2026·1 min read

Anthropic launches Fable 5.1 as AI security worries mount

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Model vendors are starting to sell safety deltas — Anthropic is explicitly tying Fable 5.1 and Mythos 5.1 to agent security incidents and scrutiny. If you're deploying agents, assume buyers will soon ask for concrete evidence of security posture, not just capability benchmarks.