计算 Token 数量(Claude)
curl --request POST \
--url https://api.leapx-hub.com/v1/messages/count_tokens \
--header 'Authorization: <authorization>' \
--header 'Content-Type: application/json' \
--data '
{
"model": "<string>",
"messages": [
{}
],
"system": {},
"tools": [
{}
]
}
'import requests
url = "https://api.leapx-hub.com/v1/messages/count_tokens"
payload = {
"model": "<string>",
"messages": [{}],
"system": {},
"tools": [{}]
}
headers = {
"Authorization": "<authorization>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: '<authorization>', 'Content-Type': 'application/json'},
body: JSON.stringify({model: '<string>', messages: [{}], system: {}, tools: [{}]})
};
fetch('https://api.leapx-hub.com/v1/messages/count_tokens', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.leapx-hub.com/v1/messages/count_tokens",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'model' => '<string>',
'messages' => [
[
]
],
'system' => [
],
'tools' => [
[
]
]
]),
CURLOPT_HTTPHEADER => [
"Authorization: <authorization>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.leapx-hub.com/v1/messages/count_tokens"
payload := strings.NewReader("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"system\": {},\n \"tools\": [\n {}\n ]\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "<authorization>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.leapx-hub.com/v1/messages/count_tokens")
.header("Authorization", "<authorization>")
.header("Content-Type", "application/json")
.body("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"system\": {},\n \"tools\": [\n {}\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.leapx-hub.com/v1/messages/count_tokens")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = '<authorization>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"system\": {},\n \"tools\": [\n {}\n ]\n}"
response = http.request(request)
puts response.read_body{
"input_tokens": 14
}
文本系列
计算 Token 数量(Claude)
POST
/
v1
/
messages
/
count_tokens
计算 Token 数量(Claude)
curl --request POST \
--url https://api.leapx-hub.com/v1/messages/count_tokens \
--header 'Authorization: <authorization>' \
--header 'Content-Type: application/json' \
--data '
{
"model": "<string>",
"messages": [
{}
],
"system": {},
"tools": [
{}
]
}
'import requests
url = "https://api.leapx-hub.com/v1/messages/count_tokens"
payload = {
"model": "<string>",
"messages": [{}],
"system": {},
"tools": [{}]
}
headers = {
"Authorization": "<authorization>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: '<authorization>', 'Content-Type': 'application/json'},
body: JSON.stringify({model: '<string>', messages: [{}], system: {}, tools: [{}]})
};
fetch('https://api.leapx-hub.com/v1/messages/count_tokens', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.leapx-hub.com/v1/messages/count_tokens",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'model' => '<string>',
'messages' => [
[
]
],
'system' => [
],
'tools' => [
[
]
]
]),
CURLOPT_HTTPHEADER => [
"Authorization: <authorization>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.leapx-hub.com/v1/messages/count_tokens"
payload := strings.NewReader("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"system\": {},\n \"tools\": [\n {}\n ]\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "<authorization>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.leapx-hub.com/v1/messages/count_tokens")
.header("Authorization", "<authorization>")
.header("Content-Type", "application/json")
.body("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"system\": {},\n \"tools\": [\n {}\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.leapx-hub.com/v1/messages/count_tokens")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = '<authorization>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"system\": {},\n \"tools\": [\n {}\n ]\n}"
response = http.request(request)
puts response.read_body{
"input_tokens": 14
}
简介
计算 Claude 消息的 token 数量,用于在发送请求前预估成本。此端点不消耗配额,仅进行本地计算。认证
string
必填
Bearer Token,如
Bearer sk-xxxxxxxxxx请求参数
string
必填
Claude 模型标识,支持的模型包括:
claude-opus-4-5-20251101(推荐替代 claude-3-opus)claude-haiku-4-5-20251001claude-sonnet-4-5-20250929claude-sonnet-4-20250514- 其他 Claude 系列模型
array
必填
对话消息列表,每个元素包含
role(user/assistant)和 content。content 可以是字符串或媒体内容数组。支持的内容类型:- 纯文本消息
- 多模态消息(包含图片)
- 工具调用结果
string|array
系统提示词(可选),可以是字符串或媒体内容数组。用于设定模型的行为和角色。
array
工具定义列表(可选),用于计算工具调用相关的 token 数量。
响应参数
number
输入消息的总 token 数量,包括:
- system prompt 的 token 数
- 所有 messages 的 token 数
- tools 定义的 token 数(如果有)
基础示例
- 简单文本消息
- 带 system prompt
- 多轮对话
- Python 示例
curl -X POST "https://api.leapx-hub.com/v1/messages/count_tokens" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer sk-xxxxxxxxxx" \
-d '{
"model": "claude-sonnet-4-5-20250929",
"messages": [
{
"role": "user",
"content": "Hello, how are you?"
}
]
}'
curl -X POST "https://api.leapx-hub.com/v1/messages/count_tokens" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer sk-xxxxxxxxxx" \
-d '{
"model": "claude-sonnet-4-5-20250929",
"system": "You are a helpful AI assistant.",
"messages": [
{
"role": "user",
"content": "What is artificial intelligence?"
}
]
}'
curl -X POST "https://api.leapx-hub.com/v1/messages/count_tokens" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer sk-xxxxxxxxxx" \
-d '{
"model": "claude-sonnet-4-5-20250929",
"messages": [
{
"role": "user",
"content": "你好"
},
{
"role": "assistant",
"content": "你好!有什么我可以帮助你的吗?"
},
{
"role": "user",
"content": "给我讲讲人工智能的历史"
}
]
}'
from anthropic import Anthropic
client = Anthropic(
api_key="sk-xxxxxxxxxx",
base_url="https://api.leapx-hub.com"
)
# 计算 token 数量
response = client.messages.count_tokens(
model="claude-sonnet-4-5-20250929",
system="You are a helpful assistant.",
messages=[
{"role": "user", "content": "Hello, Claude!"}
]
)
print(f"Input tokens: {response.input_tokens}")
{
"input_tokens": 14
}
高级用例
带工具定义的计算
curl -X POST "https://api.leapx-hub.com/v1/messages/count_tokens" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer sk-xxxxxxxxxx" \
-d '{
"model": "claude-sonnet-4-5-20250929",
"messages": [
{
"role": "user",
"content": "What is the weather in San Francisco?"
}
],
"tools": [
{
"name": "get_weather",
"description": "Get the current weather in a given location",
"input_schema": {
"type": "object",
"properties": {
"location": {
"type": "string",
"description": "The city and state, e.g. San Francisco, CA"
}
},
"required": ["location"]
}
}
]
}'
多模态内容计算
curl -X POST "https://api.leapx-hub.com/v1/messages/count_tokens" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer sk-xxxxxxxxxx" \
-d '{
"model": "claude-sonnet-4-5-20250929",
"messages": [
{
"role": "user",
"content": [
{
"type": "text",
"text": "What is in this image?"
},
{
"type": "image",
"source": {
"type": "url",
"url": "https://example.com/image.jpg"
}
}
]
}
]
}'
使用场景
1. 成本预估
在发送大量请求前,先计算 token 数量以预估成本:# 批量计算成本
messages_batch = [...] # 批量消息
total_tokens = 0
for messages in messages_batch:
response = client.messages.count_tokens(
model="claude-sonnet-4-5-20250929",
messages=messages
)
total_tokens += response.input_tokens
# 根据定价计算总成本
cost = total_tokens * price_per_token
print(f"预估成本: ${cost:.4f}")
2. 上下文窗口管理
检查消息是否超过模型的上下文窗口限制:MAX_CONTEXT_WINDOW = 200000 # Claude Sonnet 4.5 的上下文窗口
response = client.messages.count_tokens(
model="claude-sonnet-4-5-20250929",
messages=long_conversation
)
if response.input_tokens > MAX_CONTEXT_WINDOW:
print(f"警告:消息 token 数 ({response.input_tokens}) 超过上下文窗口限制")
# 执行消息截断或摘要
3. 优化提示词
比较不同提示词的 token 消耗:prompts = [
"简洁版提示词...",
"详细版提示词...",
"超详细版提示词..."
]
for prompt in prompts:
response = client.messages.count_tokens(
model="claude-sonnet-4-5-20250929",
system=prompt,
messages=[{"role": "user", "content": "测试"}]
)
print(f"{len(prompt)} 字符 -> {response.input_tokens} tokens")
注意事项
- 图片 token 使用固定估算值(约 1000 tokens),实际可能因分辨率不同而变化
- 不包括
max_tokens等输出相关参数,仅计算输入 token 数 - 此端点不会发起实际的 AI 请求,不消耗配额
错误处理
缺少必需参数
{
"type": "error",
"error": {
"type": "invalid_request_error",
"message": "Key: 'ClaudeCountTokensRequest.Model' Error:Field validation for 'Model' failed on the 'required' tag"
}
}
无效的 API Key
{
"error": {
"message": "无效的 token",
"type": "invalid_request_error"
}
}
相关资源
- 创建消息请求(Claude) - 发送实际的 Claude 请求
- 模型列表 - 查看支持的 Claude 模型
- 定价说明 - 了解 token 计费标准
⌘I
