Anthropic Mythos 1
By Anthropic
Released: 2026-06-02
Mythos 1 is the full release of Anthropic's specialised, security-focused system, graduating from the guarded Claude Mythos Preview. Built around Project Glasswing, it pairs frontier reasoning with defensive security tooling - vulnerability analysis, triage and incident response - deployed with heavy oversight and auditability. It runs alongside the general-purpose Claude family rather than replacing it.
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Anthropic Model Timeline
1M tokens context
1M tokens context
1M tokens context
1M tokens context
Long-context context
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200k tokens context
200k tokens context
1,000k tokens context
200k tokens context
200k tokens context
1,000k tokens context
200k tokens context
200k tokens context
200k tokens context
200k tokens context
200k tokens context
Specifications
AI Evaluation
A specialised defensive-security system most teams will not need - but for security organisations and platform providers, it operationalises Project Glasswing with serious reasoning depth and guardrails.
Pros
- Deep technical/security reasoning
- Auditable, contained deployment
- Defensive-first framing
Cons
- Not a general-purpose model
- Targeted access, not consumer-facing
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