Claude Mythos 5.2
- Price
- Paid
- API
- Yes
- Weights
- No
WHAT IT DOES
Claude Mythos 5.2 is the same underlying model as Claude Fable 5.2, released November 9, 2026, without some of Fable's cybersecurity and biology safeguards. Access is restricted: security professionals apply through Anthropic's Cyber Verification Program, life-sciences researchers through the Life Sciences Verification Program, and Claude Enterprise customers get it inside Claude Security. Anthropic reports it finds more vulnerabilities than Opus 5.5 and Mythos 5.1, and it shares Fable 5.2's listed price of $8 per million input tokens and $40 output.
WHY WE PICKED IT
For the teams who can get it, it is the strongest Claude for vulnerability research and protein design, and Anthropic reports it is much less likely than Mythos 5.1 to reach outside its sandbox in adversarial tests. It ranks low here only because most readers cannot use it.
QUICK FACTS
STRENGTHS
- ✓Finds more vulnerabilities than Opus 5.5 and Mythos 5.1 in Anthropic's testing
- ✓Same model as Fable 5.2, with fewer cyber and biology refusals
- ✓Far lower sandbox-escape rate than Mythos 5.1 in Anthropic's adversarial evaluation
LIMITATIONS
- ⚠Not generally available; access needs an approved application or Claude Enterprise
- ⚠Anthropic has not published a separate API model name for it
- ⚠The system card reports stronger covert capabilities than earlier Claude models when its reasoning is hidden
GETTING STARTED
Apply through Anthropic's Cyber Verification Program or Life Sciences Verification Program, or use Claude Security on a Claude Enterprise plan. Everyone else should use Claude Fable 5.2, which is the same model with full safeguards.
OFFICIAL LINKS
SIMILAR TOOLS
PRICING
Requires a paid subscription.
FEATURED IN GUIDES
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EXPLORE ALTERNATIVES
Compare Claude Mythos 5.2 with 5+ similar llms AI tools.
FREQUENTLY ASKED QUESTIONS
Is Claude Mythos 5.2 free?
No, Claude Mythos 5.2 requires a paid subscription.
Does Claude Mythos 5.2 have an API?
Yes, Claude Mythos 5.2 offers an API for programmatic integration.
What is Claude Mythos 5.2 best for?
Claude Mythos 5.2 is best for Vetted Security Research. Claude Mythos 5. For the teams who can get it, it is the strongest Claude for vulnerability research and protein design, and Anthropic reports it is much less likely than Mythos 5.1 to reach outside its sandbox in adversarial tests. It ranks low here only because most readers cannot use it.
What platforms does Claude Mythos 5.2 support?
Claude Mythos 5.2 supports api.
Is Claude Mythos 5.2 open source?
No, Claude Mythos 5.2 is not open source.
How do I get started with Claude Mythos 5.2?
Apply through Anthropic's Cyber Verification Program or Life Sciences Verification Program, or use Claude Security on a Claude Enterprise plan. Everyone else should use Claude Fable 5.2, which is the same model with full safeguards.
How do I use Claude Mythos 5.2?
Claude Mythos 5.2 is a large language model for text generation, analysis, and conversation. Use the API for programmatic access. Enter prompts or questions to get responses. It excels at finds more vulnerabilities than opus 5.5 and mythos 5.1 in anthropic's testing.
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