# clm_4CEF893703A4

subject: Anthropic (/record/anthropic.md)  
predicate: feature_added  
value: Token counting API  
valid_from: 2024-12-17  
valid_to: null  
published: 2024-12-17  
recorded: 2026-11-14  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-15  
cite: AsOf. "Anthropic feature added: Token counting API", as of 2024-12-17. Claim clm_4CEF893703A4, https://asof.is/claim/clm_4CEF893703A4, accessed 2026-11-15. Source: https://platform.claude.com/docs/en/release-notes/overview#2024-12-17.  
checked: 2026-11-15 · its source page states the value and the date, as read by an AI model  

> Token counting API : Calculate token counts for Messages before sending them to Claude.

What https://platform.claude.com/docs/en/release-notes/overview#2024-12-17 says, word for word.

## Sources

- https://platform.claude.com/docs/en/release-notes/overview#2024-12-17 (primary, Anthropic, published 2024-12-17)

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AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.