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Anthropic Website Briefly References Unannounced Claude Mythos 5.5 Model Class

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Anthropic briefly displayed text on its website describing Claude Mythos 5.5 as its most capable model class for cybersecurity and biology, according to a post by the X account TestingCatalog. The company has not announced the model in its official news feed, and the post does not confirm a release date, pricing, or customer availability. The wording suggests the label may group several configurations of one base model rather than a single checkpoint. The reference comes days after Anthropic removed the five-hour usage cap on its Claude Ultra tier for verified users. Cybersecurity and biology are domains where frontier AI developers face heightened scrutiny because of dual-use risks.

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