Claude Mythos 5.1
Anthropic · Lanzado sept 2026
Same weights as Claude Fable 5.1 at the same $10/$50 rate, with cyber and life-sciences safeguards loosened for vetted users. The catch is access: Mythos 5.1 ships only through Anthropic's trusted-access programs (Cyber Verification and Life Sciences Verification), so there is no self-serve API and no way to buy your way in. Conditional for the same reason as Mythos 5: elite capability behind a vetting gate. Everyone else should use Fable 5.1.
¿Es adecuada para ti?
Bueno para
- Vulnerability discovery and offensive-security research — cyber safeguards are loosened relative to Fable 5.1
- Agentic terminal work at the frontier: 60.9% Terminal-Bench 4.0, 5.1 points above Fable 5.1
- Life-sciences work that trips Fable 5.1's biology classifiers, for organizations inside the Life Sciences Verification Program
No recomendado para
- Any team not admitted to a verification program — there is no public API and no self-serve path
- General coding and knowledge work — identical price, identical weights, and Fable 5.1 is the one you can actually call
- Organizations outside the US — Anthropic says access is currently limited to a set of US organizations, with international expansion coordinated with the US government but undated
Rendimiento por tarea
Cybersecurity research
Loosened cyber safeguards on frontier weights; the reason the model exists
Agentic coding
60.9% Terminal-Bench 4.0, the highest published score in the 5.1 release
General knowledge work
Same weights as Fable 5.1, but no published index scores and no reason to prefer it here
Precios
Entrada
$10 / 1M tokens
Salida
$50 / 1M tokens
Contexto
1M context, $0.25/1M cache; vetted access
Pruebas de rendimiento
| Prueba | Puntuación | Fuente |
|---|---|---|
| Terminal-Bench 4.0 | 60.9% | Fuente |
Aún no hay cambios de veredicto
El reloj corre desde el primer día: los cambios aparecerán aquí a medida que evolucione nuestro veredicto.
Fuentes
Registro de verificación
Aún no hay comprobaciones de verificación
Todavía no hemos registrado ninguna comprobación de verificación para esta entrada. Cuando se ejecute una, su historial aparecerá aquí.