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Claude Fable 5.2: Prefix-Check 400 on Every Account, $8/$40, and Default Effort Is High

Attributed compile + list-price arithmetic on my box Primary announcement: Introducing Claude Fable 5.2 and Claude Mythos 5.2 (Anthropic, dated November 9, 2026 ). Primary docs: What's new in Claude Fable 5.2 , Claude Fable 5.2 overview , Claude Fable product page , Claude Platform release notes (N…

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  1. 2026-11-12 14:22 · DEV Community — AI
    Claude Fable 5.2: Prefix-Check 400 on Every Account, $8/$40, and Default Effort Is High

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