Anthropic Launches Claude Fable 5.1, Cuts Cache Costs 75% — SkimNews
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- Anthropic unveiled Claude Fable 5.1 (generally available) and Claude Mythos 5.1 (restricted to trusted partners), with Mythos carrying cybersecurity and life sciences safeguards
- Claude Fable 5.1 cuts cache read costs by 75% and delivers up to 45% savings on agentic workloads
- Anthropic signed a $3.5B cloud deal with Lambda alongside the launch
- Claude Fable 5.1 scored 52.6 on Terminal Bench Science
- Claude Fable 5.1 is excluded from the Pro subscription tier despite the broader lower-cost framing
- Anthropic promises zero data retention but requires customers to verify it actually worked
Why it matters: Anthropic's 75% cache read cut directly rewrites agent-workload economics, where pricing is now the primary competitive axis. The Mythos gating creates a two-tier trust model that hides the most capable model behind partner vetting, while the Lambda $3.5B deal and the Pro-tier exclusion signal Anthropic is steering compute-heavy value toward enterprise customers rather than Pro subscribers.
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