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Claude Mythos 5.1

Model
AnthropicFamily Claude 5restricted

A restricted-access frontier Claude model for advanced cybersecurity and life-sciences work.

Released
Sep 1, 2026
Context window
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Modality
textimage
Open source
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API available
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Releases
1

Releases

1
Sep 1, 2026Claude Mythos 5.1 released to vetted organizationsClaude Mythos 5.1 · 5.1

Anthropic released Claude Mythos 5.1 to vetted cyberdefenders and life-sciences organizations through trusted-access programs.

Anthropic Model releaseAnthropicClaude Mythos 5.1