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.

Benchmark Scores

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93.7%

GPQA

64.0 tokens_per_sec

Speed (tok/s)

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