Claude Mythos

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AnthropicFrontierProprietary

A frontier model Anthropic disclosed on April 7, 2026 but declined to release publicly, citing security risk. Shipped only via 'Project Glasswing' to ~50 defensive-security partners, then suspended on June 12, 2026 under a US government directive.

Official page ↗

Specifications

License: Proprietary
Weights: Not released
Architecture: unknown
Parameters: Undisclosed
Context window: — tokens
Max output: —
Knowledge cutoff: Nov 30, 2025
Price (in / out, $/M): —
Modalities: TextCode

Benchmarks

USAMO 2026self-reported

97.6%

source ↗

Vendor-reported figures are claims until independently verified. See methodology.