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ai morning #43 — anthropic quietly moved fable 5's safety line and sent a tweet
Anthropic pushed a live safety update to Claude Fable 5 overnight — cutting biology-related fallbacks by 85% — and announced it via a single tweet. No changelog, no API version bump, no policy post. Every app built on Fable 5 just got a different model.
Marcus walks through what changed, why Ethan Mollick called it the fourth lab this week to make a safety-adjacent move, and what it means for builders running Fable 5 in production.
In this episode:
00:00 Intro
01:15 Fable 5 biology guardrails: 85% cut — Anthropic quietly rolled back Claude Fable 5's biology safety filters on a live deployed…
The skinny
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