Unverified50% confidenceReleaseExact time

After Mythos was released, Anthropic subsequently launched a follow-on model called 'Fable'.

1

Sources

50%

Confidence

Medium-term (~90 days)

Relevance

10/2/2026

First Seen

Valid until: 12/31/2026

Sources

Why Did Anthropic's "Mythos" Security Frenzy Fade Into Silence? A Retrospective on Project Glasswing

Related Entities

Anthropiccompany Mythosmodel Fablemodel

Related Claims

UnverifiedAnthropic released a new model named 'Fable.'61% similar UnverifiedAnthropic's Fable 5 has the internal codename Mythos 5 and is its frontier research-grade model.60% similar

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