POST
/
v1
/
chat
/
completions
curl -X POST https://www.anyfast.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-20250514",
    "messages": [
      {"role": "system", "content": "You are a helpful assistant."},
      {
        "role": "user",
        "content": [
          {"type": "text", "text": "What is in this image? Please describe in detail."},
          {
            "type": "image_url",
            "image_url": {
              "url": "https://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Cat03.jpg/1200px-Cat03.jpg"
            }
          }
        ]
      }
    ],
    "stream": true
  }'

{
  "id": "chatcmpl-123",
  "object": "chat.completion",
  "created": 1677652288,
  "model": "claude-sonnet-4-20250514",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "The image shows a cat sitting on a windowsill..."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 200,
    "completion_tokens": 150,
    "total_tokens": 350
  }
}
Use Claude models to analyze and understand images through the chat-compatible format.

​
Request Parameters

​
model
string
required
The model to use. Recommended: claude-sonnet-4-20250514
​
messages
array
required
Messages array. For vision, use content array with image_url type.
​
stream
boolean
default:"false"
Whether to stream the response.
​
max_tokens
integer
Maximum number of tokens to generate.
curl -X POST https://www.anyfast.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-20250514",
    "messages": [
      {"role": "system", "content": "You are a helpful assistant."},
      {
        "role": "user",
        "content": [
          {"type": "text", "text": "What is in this image? Please describe in detail."},
          {
            "type": "image_url",
            "image_url": {
              "url": "https://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Cat03.jpg/1200px-Cat03.jpg"
            }
          }
        ]
      }
    ],
    "stream": true
  }'

{
  "id": "chatcmpl-123",
  "object": "chat.completion",
  "created": 1677652288,
  "model": "claude-sonnet-4-20250514",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "The image shows a cat sitting on a windowsill..."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 200,
    "completion_tokens": 150,
    "total_tokens": 350
  }
}