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Anthropic shipped Claude Fable 5.2 on Monday, November 9. It's cheaper than 5.1 — $8 per million input tokens and $40 per million output instead of $10 and $50 — and it took the top spot on the Artificial Analysis Intelligence Index the same day. Model ID: claude-fable-5-2 . So the obvious move is swapping one string and redeploying. I did the boring version first: I read Anthropic's official migration guide, then grepped every repo on my machine for the patterns it warns about. The guide is blunt. Moving from Fable 5.1 is "mostly drop-in" — and then it lists four changes that can break…

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