Anthropic's new Claude Fable 5 is same base model

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Anthropic Claude Fable 5: Why does the new Mythos-class AI model flag simple biology questions about cancer & mitochondria? Here's what we know
India, June 10 -- Artificial intelligence company Anthropic has introduced Claude Fable 5, a new AI system that the company describes as the first public release from its powerful Mythos class of models.

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Anthropic's Claude Fable 5 is the first mythos-level AI model you can actually use
Anthropic's new Claude Fable 5 is the same base model as Mythos but with guardrails attached
Why One Technical Change In Claude Fable Triggered A Corporate Review
According to a report from The Verge, Microsoft has restricted employee access to Anthropic's newly launched Claude Fable 5, citing concerns around the model's data retention policies.

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Anthropic says sorry to users of the new Claude Fable 5 model; says: We apologize for not getting the balance right
IT majors’ shares dip as Claude’s new model ‘pose risks’ to revenue
Microsoft Tells Employees To Avoid Anthropic's Claude Fable 5 Over Data Retention Concerns
For Microsoft, which handles sensitive customer data and proprietary code, the retention window raises compliance and confidentiality concerns.

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Microsoft Employees Face Limits on Claude Fable 5, Here’s What’s Behind It
Is Anthropic Claude Fable 5 better than Gemini 3.1 Pro and GPT 5.5? Here's a comparison