Claude-Sonnet-4-5-20250929-Thinking - File Analysis

POST

messages

claude-sonnet-4-5-20250929-thinking (file analysis)

curl --request POST \
  --url https://api.example.com/v1/messages

import requests

url = "https://api.example.com/v1/messages"

response = requests.post(url)

print(response.text)

const options = {method: 'POST'};

fetch('https://api.example.com/v1/messages', 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.example.com/v1/messages",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.example.com/v1/messages"

	req, _ := http.NewRequest("POST", url, nil)

	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.example.com/v1/messages")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.com/v1/messages")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)

response = http.request(request)
puts response.read_body

Claude’s official format for the file analysis API.

curl -X POST "https://gptproto.com/v1/messages" \
  -H "Authorization: YOUR_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "claude-sonnet-4-5-20250929-thinking",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "Please analyze this PDF document and provide a summary of its content"
        },
        {
          "type": "document",
          "source": {
            "type": "url",
            "url": "https://www.bt.cn/data/api-doc.pdf"
          }
        }
      ]
    }
  ]
}'

curl -X POST "https://gptproto.com/v1/messages" \
  -H "Authorization: YOUR_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "claude-sonnet-4-5-20250929-thinking",
  "max_tokens": 2000,
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "Please analyze this PDF document and extract the key information, main topics, and summary"
        },
        {
          "type": "document",
          "source": {
            "type": "base64",
            "media_type": "application/pdf",
            "data": "JVBERi0xLjQKJeLjz9MK..."
          }
        }
      ]
    }
  ]
}'

import anthropic

client = anthropic.Anthropic(
    api_key="YOUR_API_KEY",
    base_url="https://gptproto.com"
)

message = client.messages.create(
    model="claude-sonnet-4-5-20250929-thinking",
    max_tokens=1024,
    messages=[
        {
            "role": "user",
            "content": [
                {
                    "type": "text",
                    "text": "Please analyze this PDF document and provide a summary of its content"
                },
                {
                    "type": "document",
                    "source": {
                        "type": "url",
                        "url": "https://www.bt.cn/data/api-doc.pdf"
                    }
                }
            ]
        }
    ]
)

print(message.content)

import anthropic
import base64

client = anthropic.Anthropic(
    api_key="YOUR_API_KEY",
    base_url="https://gptproto.com"
)

# Read and encode file
with open("document.pdf", "rb") as file:
    base64_file = base64.b64encode(file.read()).decode('utf-8')

message = client.messages.create(
    model="claude-sonnet-4-5-20250929-thinking",
    max_tokens=2000,
    messages=[
        {
            "role": "user",
            "content": [
                {
                    "type": "text",
                    "text": "Please analyze this PDF document and extract the key information, main topics, and summary"
                },
                {
                    "type": "document",
                    "source": {
                        "type": "base64",
                        "media_type": "application/pdf",
                        "data": base64_file
                    }
                }
            ]
        }
    ]
)

print(message.content)

import Anthropic from '@anthropic-ai/sdk';

const client = new Anthropic({
  apiKey: 'YOUR_API_KEY',
  baseURL: 'https://gptproto.com'
});

const message = await client.messages.create({
  model: 'claude-sonnet-4-5-20250929-thinking',
  max_tokens: 1024,
  messages: [
    {
      role: 'user',
      content: [
        {
          type: 'text',
          text: 'Please analyze this PDF document and provide a summary of its content'
        },
        {
          type: 'document',
          source: {
            type: 'url',
            url: 'https://www.bt.cn/data/api-doc.pdf'
          }
        }
      ]
    }
  ]
});

console.log(message.content);

import Anthropic from '@anthropic-ai/sdk';
import fs from 'fs';

const client = new Anthropic({
  apiKey: 'YOUR_API_KEY',
  baseURL: 'https://gptproto.com'
});

// Read and encode file
const base64File = fs.readFileSync('document.pdf').toString('base64');

const message = await client.messages.create({
  model: 'claude-sonnet-4-5-20250929-thinking',
  max_tokens: 2000,
  messages: [
    {
      role: 'user',
      content: [
        {
          type: 'text',
          text: 'Please analyze this PDF document and extract the key information, main topics, and summary'
        },
        {
          type: 'document',
          source: {
            type: 'base64',
            media_type: 'application/pdf',
            data: base64File
          }
        }
      ]
    }
  ]
});

console.log(message.content);

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    url := "https://gptproto.com/v1/messages"

    payload := []byte(`{
  "model": "claude-sonnet-4-5-20250929-thinking",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "Please analyze this PDF document and provide a summary of its content"
        },
        {
          "type": "document",
          "source": {
            "type": "url",
            "url": "https://www.bt.cn/data/api-doc.pdf"
          }
        }
      ]
    }
  ]
}`)

    req, _ := http.NewRequest("POST", url, bytes.NewBuffer(payload))
    req.Header.Set("Authorization", "YOUR_API_KEY")
    req.Header.Set("anthropic-version", "2023-06-01")
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := ioutil.ReadAll(resp.Body)
    fmt.Println(string(body))
}

package main

import (
    "bytes"
    "encoding/base64"
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
    "os"
)

func main() {
    url := "https://gptproto.com/v1/messages"

    // Read and encode file
    fileData, _ := os.ReadFile("document.pdf")
    base64File := base64.StdEncoding.EncodeToString(fileData)

    payload := map[string]interface{}{
        "model": "claude-sonnet-4-5-20250929-thinking",
        "max_tokens": 2000,
        "messages": []map[string]interface{}{
            {
                "role": "user",
                "content": []map[string]interface{}{
                    {
                        "type": "text",
                        "text": "Please analyze this PDF document and extract the key information, main topics, and summary",
                    },
                    {
                        "type": "document",
                        "source": map[string]interface{}{
                            "type": "base64",
                            "media_type": "application/pdf",
                            "data": base64File,
                        },
                    },
                },
            },
        },
    }

    jsonData, _ := json.Marshal(payload)
    req, _ := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
    req.Header.Set("Authorization", "YOUR_API_KEY")
    req.Header.Set("anthropic-version", "2023-06-01")
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := ioutil.ReadAll(resp.Body)
    fmt.Println(string(body))
}

{
  "error": {
    "type": "authentication_error",
    "message": "Invalid API key"
  }
}

{
  "error": {
    "type": "invalid_request_error",
    "message": "messages: field required"
  }
}

{
  "error": {
    "type": "rate_limit_error",
    "message": "Rate limit exceeded"
  }
}

{
  "error": {
    "type": "api_error",
    "message": "Internal server error"
  }
}

{
  "error": {
    "type": "overloaded_error",
    "message": "Service is temporarily overloaded"
  }
}

Parameters

Parameter	Type	Required	Default	Description
`model`	string	✅ Yes	`claude-sonnet-4-5-20250929-thinking`	The model to use for file analysis
`messages`	array	✅ Yes	-	Array of message objects for the conversation. Each message must have a role (user or assistant) and content. Content can include: - Text blocks with type “text” - Document blocks with type “document” containing: - source: Object with type “base64” or “url” - For base64: media_type (e.g., “application/pdf”) and data (base64 string) - For url: url field with the file URL Supported file formats: PDF, DOCX, XLSX, TXT, CSV, JSON, XML, HTML Maximum file size: 20MB Example with URL: `json [ { "role": "user", "content": [ { "type": "text", "text": "Please analyze this document" }, { "type": "document", "source": { "type": "url", "url": "https://example.com/document.pdf" } } ] } ]` Example with base64: `json [ { "role": "user", "content": [ { "type": "text", "text": "Please analyze this document" }, { "type": "document", "source": { "type": "base64", "media_type": "application/pdf", "data": "JVBERi0xLjQKJeLjz9MK..." } } ] } ]`
`max_tokens`	integer	✅ Yes	`1024`	The maximum number of tokens to generate before stopping
`temperature`	number	❌ No	`1.0`	Amount of randomness injected into the response. Ranges from 0.0 to 1.0
`top_p`	number	❌ No	`1.0`	Use nucleus sampling. Ranges from 0.0 to 1.0
`top_k`	integer	❌ No	`null`	Only sample from the top K options for each subsequent token
`stream`	boolean	❌ No	`false`	Whether to incrementally stream the response using server-sent events
`stop_sequences`	array	❌ No	-	Custom text sequences that will cause the model to stop generating

Messages Array Structure

Each message object in the messages array should have the following structure:

Field	Type	Required	Description
`role`	string	✅ Yes	The role of the message. Can be: `user`, `assistant`, or `system`
`content`	array/string	✅ Yes	The content of the message

Content Array Structure (when content is an array)

Field	Type	Required	Example	Description
`type`	string	✅ Yes	`text`	The type of content
`text`	string	✅ Yes	`"The positive prompt for the generation."`	The text content when type is `text`

​Parameters

​Messages Array Structure

​Content Array Structure (when content is an array)

Parameters

Messages Array Structure

Content Array Structure (when content is an array)