Count tokens (LangChain - Anthropic format)

Counts tokens using Anthropic-compatible format via LangChain.

POST /langchain/anthropic/v1/messages/count_tokens

Error

A valid request URL is required to generate request examples

200

{
  "input_tokens": 123
}

Authorizations

BearerAuthBasicAuthVirtualKeyAuthApiKeyAuth

Authorization · string · header · required

Bearer token authentication. Use your provider API key or Bifrost authentication token. Virtual keys (prefixed with sk-bf-) can also be passed here.

Body

application/json

model · string · required

Model identifier (e.g., claude-3-opus-20240229)

Example:

"claude-3-opus-20240229"

max_tokens · integer · required

Maximum tokens to generate

messages · object[] · required

List of messages in the conversation

Show child attributes

system · string object[]

System prompt

cache_control · object

Automatic caching directives for the whole request

Show child attributes

metadata · object

Show child attributes

stream · boolean

Whether to stream the response

temperature · number

Required range: 0 <= x <= 1

top_p · number

top_k · integer

stop_sequences · string[]

tools · object[]

Show child attributes

tool_choice · object

Show child attributes

mcp_servers · object[]

MCP servers configuration (requires beta header)

Show child attributes

thinking · object

Show child attributes

output_format · object

Structured output format (requires beta header)

fallbacks · string[]

Response

200

application/json

Successful response

input_tokens · integer

Number of input tokens