Anthropic cuts cache reads 75% to $0.25/M tokens as it ships Claude Fable 5.1
dl_weekly · x · 2026-09-05
Anthropic ships Claude Fable 5.1 and Claude Mythos 5.1
- One model, two safeguard tiers: Fable 5.1 is generally available; Mythos 5.1 is gated behind trusted access programs with safeguards tuned for cybersecurity and life sciences work.
- Price cuts: cache reads drop 75% to $0.25 per million tokens; typical workloads get 25% cheaper, agentic workloads up to 45%.
- Data retention: new Enterprise Frontier Safeguards (EFS) store data entirely in customer-controlled cloud infrastructure — zero-data-retention privacy while keeping adversarial-use protections; rolling out to enterprises this fall, with ZDR available in the meantime.
- Guardrails: cybersecurity false positives down 60%.
- Capabilities: Terminal-Bench-Science score more than doubles to 52.6, framed as an early look at AI-driven scientific progress.
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