Anthropic: Fable 5.2's preserved thinking now covers all API accounts to prevent knowledge distillation
Anthropic announced that to prevent knowledge distillation, preserved thinking in Fable 5.2 now covers all API accounts. Editing prior context may return a 400 error; consider using compaction, context editing, or system messages mid-session instead. Claude Code, Managed Agents, and Agent SDK will handle this automatically. Documentation is available at https://platform.claude.com/docs/bui
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