v40

latestOpenAPI 3.0.0raw.githubusercontent.com2026-08-01108178385.8 KB

messages

Count message tokens (Anthropic Messages API)

Returns a provider-agnostic heuristic estimate of the input token count.

post/v1/messages/count_tokens

Request body

max_tokensinteger

modelstring

stop_sequencesstring[]

streamboolean

temperaturenumber

top_kinteger

top_pnumber

Response

OK

input_tokensinteger