GoKawiilAnthropic releases Claude Fable 5.1, cuts agentic task costs by up to 45%
Anthropic has released Claude Fable 5.1 and Mythos 5.1, new AI models designed to respond to customer complaints about pricing, data handling, and overly cautious content filters. Fable 5.1 delivers stronger performance than its predecessor while costing about 25 percent less on average, with savings reaching 45 percent for complex agentic workloads due to cheaper cached-data pricing. Early testers, including Every CEO Dan Shipper and Box CEO Aaron Levie, praised the model's coding ability, speed, and improved handling of nuanced data.
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Lower costs for agentic tasks could make Claude more attractive for enterprises building automated workflows, an area where AI pricing has been a major barrier to adoption. The looser safeguards on basic biology questions alongside unchanged restrictions in Mythos 5.1 show Anthropic is trying to balance usability with safety concerns differently across its model tiers. Expanding Fable 5.1's role in identifying software vulnerabilities, while still routing sensitive cybersecurity work to Opus models, signals a cautious approach to AI's growing use in security research.
- Fable 5.1 is up to 45% cheaper for agentic tasks due to reduced cached-data pricing.
- Fable 5.1 has looser biology-related safeguards, while Mythos 5.1 retains stricter restrictions.
- Anthropic will roll out Enterprise Frontier Safeguards this fall, storing data on customers' own servers for added privacy.
Source: theverge.com — Stevie Bonifield, 2026-09-01
Published there as: “Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work”
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