Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work
TL;DR
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 on cached data that was already processed and stored.
Nauti's Take
Cheaper cache pricing hits the most expensive part of agentic systems, since reused context drives most of the bill on long tool chains. The catch is where the number comes from, because the 45 percent is a vendor figure and depends heavily on your own setup.
Teams running long-context workloads should measure cache hit rate, latency, and total cost separately, and put data retention in the same test plan.
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