ReportedReported by fewer than three independent publishers, with no official finding.
Meet Claude Mythos: Leaked Anthropic post reveals the powerful upcoming model
An accidental leak has now been officially confirmed by AI company Anthropic regarding its most powerful AI model yet. The model, now known as “Claude Mythos,” was originally uncovered in a report from Fortune...
DII-2026-000884 sources ↓
What happened
Not publicly disclosed.
Classification
Sources and evidence
This record was researched and written by the Index, based on the following original reporting.
DataBreaches.net
Meet Claude Mythos: Leaked Anthropic post reveals the powerful upcoming model
28 March 2026