Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work — SkimNews
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- Anthropic launched Claude Fable 5.1 and Mythos 5.1, with Fable 5.1 costing roughly 25% less typically and up to 45% less for complex agentic tasks thanks to reduced cached-data pricing.
- Mythos 5.1 debuts inside Project Glasswing only, while Fable 5.1 rolls out across all Anthropic platforms.
- Dan Shipper (Every CEO) called Fable 5.1 "the strongest coding model we've used," while Box CEO Aaron Levie said his company's agent caught subtleties and ambiguities that Fable 5 missed on the same test.
- Fable 5.1 ships with more precise safeguards that are less likely to block basic biology questions than Fable 5, though Mythos 5.1 retains the same biology restrictions as its predecessor.
- Anthropic now permits Fable 5.1 for identifying software vulnerabilities, but continues redirecting penetration testing, exploit generation, and binary-based vulnerability scanning to Opus models.
- Enterprise Frontier Safeguards will store customer data on the customer's own cloud servers instead of Anthropic's, with rollout beginning later this fall.
Why it matters: Anthropic's enterprise customers gain cheaper complex agentic runs (up to 45%), software-vulnerability identification rights, and customer-side cloud data storage rolling out this fall. The pricing reset directly addresses customer complaints about cost, data retention, and overzealous safeguards cited in the announcement itself.
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