Dylan Patel claims Anthropic finished Mythos 2 but skipped release, building Mythos 3

KeanuRave100 · reddit · 2026-08-19

According to a Reddit post citing analyst Dylan Patel (founder of SemiAnalysis), Anthropic has completed training Mythos 2 internally but chose not to release it, moving straight to developing Mythos 3.

> Note: this is a single-source claim, unconfirmed by Anthropic; the "Mythos" model line has no official public naming, so treat with caution.

Related event: SemiAnalysis Claims Anthropic Finished Training Mythos 2 but Shelved It, Pivoting to Mythos 3(5 posts)→

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