#effort control

Tagged effort control · show all articles

A two-monitor developer desk with Claude Code open in a terminal on the left screen and Anthropic's documentation open on the right, a hand-written sticky note with token-cost math caught mid-stroke on the desk between them

Building with Claude Fable 5.1: A Practitioner's Guide

claude-fable-5-1 keeps Fable 5's headline price and adds a cache-read discount, a mid-conversation effort switch, and a watermark you cannot turn off — this is what Anthropic's own documentation says a builder needs to know before shipping against it.

By Brecht Corbeel · September 3, 2026 · 15 min read

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