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New Fable 5 Is a "Mythos-Class" LLM Available to All, Anthropic Announces

ID: 313c1e23-a91e-520d-8512-89f30b229993

STIX ID: report--313c1e23-a91e-520d-8512-89f30b229993

Feed Name: Infosecurity Magazine (News)

Date Published: 2026-06-10

Date Updated: 2026-06-10

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Anthropic announced Claude Mythos 5 and Claude Fable 5 — the former positioned as a high-capability cybersecurity model initially restricted to Project Glasswing and vetted partners, the latter featuring additional guardrails and wider availability via Microsoft Foundry. The article covers pricing, deployment plans, and varied industry reactions emphasizing benefits for defenders but warning that guardrails may be insufficient and that access should be carefully governed.

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