Claude Messages API

{
  "role": "user",
  "content": [
    {
      "type": "image",
      "source": { "type": "base64", "media_type": "image/png", "data": "iVBORw0KGgo..." }
    },
    { "type": "text", "text": "How many rows does the table in this image have?" }
  ]
}

curl https://www.tutujin.com/v1/messages \
  -H "x-api-key: $TUTUJIN_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-5-5",
    "max_tokens": 1024,
    "system": "You are a careful legal assistant. Cite the contract clause numbers you rely on.",
    "messages": [
      {"role": "user", "content": "The penalty is set at 30% of the contract value. What are the risks?"}
    ]
  }'

import os
import anthropic

client = anthropic.Anthropic(
    base_url="https://www.tutujin.com",
    api_key=os.environ["TUTUJIN_API_KEY"],
)

message = client.messages.create(
    model="claude-sonnet-5-5",
    max_tokens=1024,
    system="You are a careful legal assistant. Cite the contract clause numbers you rely on.",
    messages=[{"role": "user", "content": "The penalty is set at 30% of the contract value. What are the risks?"}],
)
print(message.content[0].text)
print(message.usage)

import Anthropic from '@anthropic-ai/sdk'

const client = new Anthropic({ baseURL: 'https://www.tutujin.com', apiKey: process.env.TUTUJIN_API_KEY })

const message = await client.messages.create({
  model: 'claude-sonnet-5-5',
  max_tokens: 1024,
  system: 'You are a careful legal assistant. Cite the contract clause numbers you rely on.',
  messages: [{ role: 'user', content: 'The penalty is set at 30% of the contract value. What are the risks?' }],
})
console.log(message.content[0].text)
console.log(message.usage)

{
  "id": "msg_...",
  "type": "message",
  "role": "assistant",
  "model": "claude-sonnet-5-5",
  "content": [
    { "type": "text", "text": "A 30% penalty is high and a court may treat it as excessive..." }
  ],
  "stop_reason": "end_turn",
  "stop_sequence": null,
  "usage": {
    "input_tokens": 52,
    "output_tokens": 210,
    "cache_creation_input_tokens": 0,
    "cache_read_input_tokens": 0
  }
}

event: message_start
data: {"type":"message_start","message":{"id":"msg_...","type":"message","role":"assistant","content":[],"usage":{"input_tokens":52,"output_tokens":1}}}

event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}

event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"A 30% penalty"}}

event: content_block_stop
data: {"type":"content_block_stop","index":0}

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null},"usage":{"output_tokens":210}}

event: message_stop
data: {"type":"message_stop"}

with client.messages.stream(
    model="claude-sonnet-5-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Write a 60-word product description"}],
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)
    print("\n", stream.get_final_message().usage)

const stream = client.messages.stream({
  model: 'claude-sonnet-5-5',
  max_tokens: 1024,
  messages: [{ role: 'user', content: 'Write a 60-word product description' }],
})
stream.on('text', (text) => process.stdout.write(text))
const final = await stream.finalMessage()
console.log('\n', final.usage)

{
  "model": "claude-sonnet-5-5",
  "max_tokens": 1024,
  "system": [
    { "type": "text", "text": "You are an after-sales agent. Answer only from the return policy below." },
    { "type": "text", "text": "(the full, long return policy goes here)", "cache_control": { "type": "ephemeral" } }
  ],
  "messages": [{ "role": "user", "content": "Can I return an opened item?" }]
}