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Claude Mythos 5.1

New· 4

Anthropic's restricted-access version of Claude Fable 5.1 for vetted cybersecurity and life-sciences organisations

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TrustList summary

Claude Mythos 5.1 is a restricted-access model from Anthropic, announced on 1 September 2026 as the counterpart to Claude Fable 5.1. Anthropic says the two are the same underlying model, with the cybersecurity and biology safeguards reduced for authorised users.

What Claude Mythos 5.1 does

  • Cybersecurity work: access through the Cyber Verification Program for cyberdefenders.
  • Life sciences work: access through an invite-only Life Sciences Verification Program.
  • Reported gains: Anthropic describes gains in cybersecurity and biology, but the announcement gives no scores.

Customers and markets

Organisations admitted through the vetted-access programmes. For now the programmes admit only US organisations, and Anthropic says the group is widening.

Key facts

  • Announced: 1 September 2026
  • Access: through vetted-access programmes only, with no purchase or usage tier that grants entry
  • Data retention: 30 days by default for safety monitoring

Summary written by TrustList from the business's own published information, Oct 2026.

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Trust Score

4/ 100
Trust Score: New

An earned signal from verification, reviews, awards, transparency and engagement - the vendor can't buy it.

Verification
0/100 · 20%
Reviews
0/100 · 30%
Awards
0/100 · 15%
Transparency
18/100 · 20%
Engagement
0/100 · 15%
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Recommendations
Coming soon
Complaints
Coming soon

Updated 9/16/2026

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