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.
More from Companies & People
- Anthropic's early NYC pop-up gave everything away for free; equity since then has 10x'd — signulll · 2026-09-05
- Product Hunt appears to have dropped its founders-only launch rule — ThePeterMick · 2026-09-05
- VentureBeat Editorial Director exits after 3 years and 700+ AI stories — MichaelFNunez · 2026-09-05
- Anthropic calls SFPD over threat against CEO made in Claude; user says misunderstanding — kyliebytes · 2026-09-05
- DeepMind researcher weighs monitorability tradeoffs: invest more or halt shipping less monitorable models — sandersted · 2026-09-05
- SF AI founder: "I love to shovel VC money into the fire pit — turning dollars into tokens" — Scobleizer · 2026-09-05