Anthropic AI Models Slash Costs by Up to 45% With Fable 5.1
Anthropic has released two new Anthropic AI models, Claude Fable 5.1 and Mythos 5.1, in a move that directly answers the loudest complaints customers have voiced about the company’s earlier releases: cost, data privacy, and safeguards that got in the way of legitimate work. The upgrade lands with pricing that Anthropic says cuts costs by roughly 25 percent for typical use and up to 45 percent for heavier agentic workloads, alongside new permissions that let one of the models hunt for software vulnerabilities for the first time.
Key takeaways
- Anthropic launched Claude Fable 5.1 and Mythos 5.1, positioning both as direct responses to customer complaints about price, data retention, and overly cautious safeguards.
- Fable 5.1 costs about 25 percent less than Fable 5 for typical tasks and up to 45 percent less for complex agentic work, thanks to cheaper pricing on cached data.
- Mythos 5.1 running on low reasoning matches the benchmark scores its predecessor achieved on Max reasoning, according to commentary from Lisan al Gaib.
- Enterprise Frontier Safeguards will let customers store data on their own cloud servers instead of Anthropic’s, rolling out later this fall.
- Fable 5.1 can now be used to identify software vulnerabilities, though tasks like penetration testing still go to Anthropic’s Opus models.
Anthropic Unveils Claude Fable 5.1 and Mythos 5.1
Anthropic built Fable 5.1 and Mythos 5.1 to fix three specific pain points customers had flagged: pricing, how long data gets retained, and safeguards that were sometimes too aggressive. Rather than presenting this as a routine model refresh, Anthropic frames it as a direct answer to feedback from paying users who felt earlier versions were too expensive, too cautious, or too opaque about where their data ended up.
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