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Claude Mythos 5.1Verification required

Claude Fable 5.1 for verified organizations

How refusals and fallback work
Context window
1Mtokens
Max output
128Ktokens
Input pricing
$10/ MTok
Output pricing
$50/ MTok
Claude Mythos 5.1 is available only to organizations verified through Anthropic’s verification programs, such as the Cyber Verification Program. It has the same specifications and pricing as Claude Fable 5.1. To request access, apply to the program that covers your use case.
See Claude Fable 5.1

Cómo se compara

ModelContextMax outputPrice / MTokLatencyThinkingDefault effortKnowledge cutoff
Claude Fable 5.11M128K$10 / $50SlowerAdaptive (always on)highJun 2026
Claude Mythos 5.1This model1M128K$10 / $50SlowerAdaptive (always on)highJun 2026
Claude Opus 5.51M128K$4 / $20ModerateAdaptive (always on)mediumJun 2026
Claude Sonnet 5.51M128K$2 / $10FastAdaptivehighJun 2026
Claude Haiku 5.51M128KFrom $0.10 / $0.50FastestAdaptivemediumJun 2026

Especificaciones

Model IDs

Claude API
Amazon Bedrock
Google Cloud
Microsoft Foundry

Pricing

Input
$10 / MTok
Output
$50 / MTok
5m cache write
$12.50 / MTok
1h cache write
$20 / MTok
Cache read
$0.25 / MTok
Batch API
50% discount on input and output

Full price list

Capabilities

Max output
128K tokens
Thinking
Adaptive (always on)
Comparative latency
Slower
Input → output
Text and images → text
Reliable knowledge cutoff
Jun 2026
Training data cutoff
Jun 2026

Availability

Status
Active (verification required)
Released
September 1, 2026
Retirement
Not sooner than September 1, 2027

Referencia

Qué cambia cuando pasas de Claude Mythos 5.

Evaluaciones de seguridad y decisiones de despliegue para Claude Fable 5.1 y Claude Mythos 5.1.

Lista completa de precios, incluidos los descuentos por lotes y las tarifas de almacenamiento en caché de prompts.

Cómo funcionan los IDs de modelo, los alias y los snapshots fijados.

Estado del ciclo de vida y compromisos de retiro para cada modelo de Claude.

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