Count message tokens (Anthropic Messages API)

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

POST {base_url}/v1/messages/count_tokens

Error

A valid request URL is required to generate request examples

200

{
  "input_tokens": 123
}

Authorizations

Authorization · string · header · required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Body

application/json

Anthropic Messages request

max_tokens · integer

messages · object[]

Show child attributes

metadata · object

Show child attributes

model · string

stop_sequences · string[]

stream · boolean

system · string object[]

temperature · number

thinking · object

Show child attributes

tool_choice · object

Show child attributes

tools · object[]

Show child attributes

top_k · integer

top_p · number

Response

200

application/json

OK

input_tokens · integer