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POST
/
langchain
/
anthropic
/
v1
/
messages
/
count_tokens
Error
A valid request URL is required to generate request examples
{
  "input_tokens": 123
}

Authorizations

​
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

​
system

System prompt

​
cache_control
object

Automatic caching directives for the whole request

​
metadata
object
​
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[]
​
tool_choice
object
​
mcp_servers
object[]

MCP servers configuration (requires beta header)

​
thinking
object
​
output_format
object

Structured output format (requires beta header)

​
fallbacks
string[]

Response

Successful response

​
input_tokens
integer

Number of input tokens