Anthropic’s Fable 5.1 delivers marginal gains at massive cost

Anthropic’s new Fable 5.1 and Mythos 5.1 models promise stronger performance and major savings for repeated agent workloads, but independent testing cited by Matthew Berman suggests Fable 5.1 still costs more per completed task. The releases also introduce so-called customer-controlled data storage, new anti-distillation safeguards, and model watermarking.
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https://4sysops.com/archives/anthropics-fable-5-1-delivers-marginal-gains-at-massive-cost/