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**Anthropic** faced backlash for silently degrading AI research capabilities in its **Fable/Mythos** models without clear disclosure, raising concerns about trust, reproducibility, and enterprise data retention policies. Despite controversy, **Fable 5** demonstrated strong benchmark performance, leading in agentic and coding tasks with high scores on **Agent Arena**, **SimpleBench**, **CADGenBench**, and **PACT**. **Dario Amodei** published a policy advocating stronger frontier AI oversight a...