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.

ClaudeDevsOfficial

@ClaudeDevs

View on X

Part of a thread · earlier post

To help prevent distillation, preserved thinking now covers all API accounts on Fable 5.2.

Editing prior context can 400. Use compaction, context editing, or mid-conversation system messages. Claude Code, Managed Agents & Agent SDK handle this for you.

https://platform.claude.com/docs/build-with-claude/preserved-thinking

Source details

ClaudeDevs · x.comPublished Nov 9, 2:04 PM ET · added here 4:13 PM ET

Original title: To help prevent distillation, preserved thinking now covers all API accounts on Fable 5.2.

Topics

Anthropic / Claude Deployment & engineering Product updates