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Anthropic extends preserved thinking to all Fable 5.2 API accounts

1 article1 sourcesince Nov 9Last article 6h ago ·

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Anthropic says preserved thinking now covers all API accounts on Fable 5.2, and describes the change as a way to help prevent distillation.

Editing prior context can return a 400 error, so Anthropic recommends compaction, context editing, or mid-conversation system messages instead. Claude Code, Managed Agents, and the Agent SDK handle this automatically.

Written by AI from the articles below · updated Nov 9, 4:17 PM ET

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Latest developmentNov 9, 2:04 PM ET
Anthropic extends preserved thinking to all Fable 5.2 API accounts

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Nov 9
  1. ClaudeDevsOfficial
    Anthropic extends preserved thinking to all Fable 5.2 API accounts

    AIAnthropic says preserved thinking now covers all API accounts on Fable 5.2, a change it describes as a way to help prevent distillation. Editing prior context can return a 400 error, so the company recommends compaction, context editing, or mid-conversation system messages instead. Claude Code, Managed Agents, and the Agent SDK handle this automatically.

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