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Anthropic releases Fable 5.1 with unchanged input/output pricing and 75% cache read cut

Techmeme 78 min read ↗ Original

Anthropic released Claude Fable 5.1 at $10/1M input and $50/1M output tokens, unchanged from Fable 5, while slashing cache read pricing 75% to $0.25/1M tokens.

WHY IT MATTERS

The steep cache read reduction makes persistent and agentic workloads significantly cheaper for teams whose architectures reuse prompt prefixes or context. However, Artificial Analysis reports Fable 5.1 costs 20% more per task than Fable 5, so savings depend heavily on cache hit rates and usage patterns.

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The three things worth knowing

01

Fable 5.1 keeps input pricing at $10/1M tokens and output pricing at $50/1M tokens, unchanged from Fable 5.

02

Cache read pricing drops 75% to $0.25/1M tokens, directly benefiting workloads that reuse context.

03

Anthropic also released Mythos 5.1 for trusted partners only, with safeguards tailored to cybersecurity and life sciences.

THE CLUSTER

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Techmeme Anthropic prices Fable 5.1 at $10/1M input tokens and $50/1M output tokens, unchanged from Fable 5, and cuts cache read pricing by 75% to $0.25/1M tokens (Frederic Lardinois/The New Stack) Open ↗