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Coverage· Unknown· Published Sep 2, 2026

Anthropic announces Claude Fable 5.1 and Mythos 5.1 with claimed agentic-work savings of up to 45%

Anthropic announced Claude Fable 5.1 and Mythos 5.1, saying Fable 5.1 performs better than its predecessor and typically costs about 25% less, with savings of up to 45% on complex agentic tasks. Fable 5.1 is broadly available, while Mythos 5.1 is limited to Project Glasswing participants.

Coverage

DNA Brief

Signal Summary

Anthropic attributed the claimed savings mainly to lower pricing for cached data that has already been processed and stored. Every CEO Dan Shipper called Fable 5.1 the strongest coding model his company had used, while Box CEO Aaron Levie said an agent using it found details and ambiguities that Fable 5 missed in the same test. Anthropic also announced revised safeguards and expanded privacy and cybersecurity policies.

Why It Matters

If Anthropic’s pricing and performance claims hold, organizations running complex agentic tasks with cached data could face lower operating costs than with Fable 5, potentially changing the economics of longer AI workflows. Access is not equal across the launch: Fable 5.1 is broadly available, but Mythos 5.1 remains restricted to Project Glasswing participants.

Evidence

Start with the primary evidence, then review supporting sources and context.

1 items

Primary Evidence

1
  • The VergeDocumentOriginal

    Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work

    Stevie Bonifield

    “Anthropic says its newest AI models, Fable 5.1 and Mythos 5.1, address criticisms from customers about price, data retention, and overzealous safeguards. The company claims Claude Fable 5.1 offers stronger performance than Fable 5, but costs around 25 percent less typically and up to 45 percent less for complex agentic tasks, thanks to reduced pricing [...]”
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