# clm_032E0FE3CE1C

subject: Claude Sonnet 5 (/record/claude-sonnet-5.md)  
predicate: feature_removed  
value: manual extended thinking  
valid_from: 2026-06-30  
valid_to: null  
published: 2026-06-30  
recorded: 2026-11-10  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-10  
cite: AsOf. "Claude Sonnet 5 feature removed: manual extended thinking", as of 2026-06-30. Claim clm_032E0FE3CE1C, https://asof.is/claim/clm_032E0FE3CE1C, accessed 2026-11-11. Source: https://platform.claude.com/docs/en/release-notes/overview#2026-06-30.  
checked: 2026-11-10 · its source page states the value and the date  

> manual extended thinking ( thinking: {type: "enabled", budget_tokens: N} ) is removed and returns a 400 error (it was deprecated on Sonnet 4.6)

What https://platform.claude.com/docs/en/release-notes/overview#2026-06-30 says, word for word.

## Sources

- https://platform.claude.com/docs/en/release-notes/overview#2026-06-30 (primary, Anthropic, published 2026-06-30)

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