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Anthropic website mentions unreleased Claude Mythos 5.5 model

1 article1 sourcesince Nov 1Last article Nov 1, 10:31 AM ET

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A hidden mention of "Claude Mythos 5.5" was spotted on Anthropic's official website, described as "our most capable model class for cybersecurity and biology research," according to TestingCatalog, which reported it on X on November 1, 2026.

TestingCatalog speculates a Mythos 5.5 cyber-defense release could come next week, with Fable 5.5 possibly following, but says this is unconfirmed. Anthropic has not announced the model.

Written by AI from the articles below · updated Nov 1, 10:56 AM ET

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Latest developmentNov 1, 10:31 AM ET

Anthropic website hints at Claude Mythos 5.5 for cybersecurity and biology

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The articles in this story. Times are ET.

Nov 1

10:31 AM
🚨 AI News | TestingCatalog@testingcatalogX
Anthropic website hints at Claude Mythos 5.5 for cybersecurity and biology
AIA mention of "Claude Mythos 5.5" was spotted on Anthropic's official website, described as "our most capable model class for cybersecurity and biology research." Testing Catalog speculates a Mythos 5.5 cyber-defense release could come next week, with Fable 5.5 possibly following, but this remains unconfirmed.

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