Anthropic cuts cache reads to $0.25/M tokens — append-only chats save 87% per call
atShruti · x · 2026-09-02
Anthropic dropped cache read pricing to $0.25 per million tokens (a quarter of base). Same call on Claude Fable 5.1 — 200k tokens in, 5k out: $2.25 cold vs $0.30 cached.
- Investor atShruti argues most pre-seed teams optimize model choice, but architecture is the real cost lever
- Practical tip: keep conversations append-only — editing earlier turns invalidates cache and thinking blocks
- Fable 5.1 also ships 3 breaking changes (forced tool use errors, etc.) and beta features like per-message effort and turn-scoped system messages
Related event: Anthropic Releases Fable 5.1 and Mythos 5.1 with 75% Cheaper Caching(174 posts)→
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