Claude Fable 5.1

Name: Claude Fable 5.1
Price: 10 USD
Author: Anthropic

Anthropic🇺🇸 United States

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Context window1000K tokens

Input / 1M tokens$10

Output / 1M tokens$50

Version History

5.1minorSeptember 1, 2026

Fable 5.1 upgrades Fable 5 with claimed improvements on coding and long-running problem-solving tasks, plus cache-read pricing cuts of up to 45% for agentic workloads. Anthropic also released Mythos 5.1, an identical model with restricted safeguards for cybersecurity and life sciences use.

Coverage

model releaseAnthropic

Anthropic Releases Claude Fable 5.1, Cuts Agentic Workload Pricing Up to 45%

Anthropic has released Claude Fable 5.1, an upgrade to its top-tier Fable 5 model launched in June, alongside a restricted-access sibling called Mythos 5.1. The company claims the new model matches or beats Fable 5's performance while cutting costs by up to 45% on agentic workloads through reduced cache-read pricing.

September 1, 2026 · 6:20 PM3 min read

Anthropic Claude Fable 5.1