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Meet Claude Mythos: Leaked Anthropic post reveals the powerful upcoming model

ID: 2b5eb0b1-e7c2-5e46-beb8-c93c76cfe341

STIX ID: report--2b5eb0b1-e7c2-5e46-beb8-c93c76cfe341

Feed Name: DataBreaches.Net

Threat Score
35/100

Date Published: 2026-03-28

Date Updated: 2026-04-19

Author: Dissent

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Anthropic confirmed an accidental data leak that exposed nearly 3,000 internal assets—such as details of an unreleased AI model named Claude Mythos, an exclusive CEO event, PDFs, and images—after files uploaded to its CMS were not marked private and were stored in a publicly accessible data lake.

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