Claude API integration - Access Claude 3.5 Sonnet, Claude 3 Opus, Claude 3 Haiku through UniterRouter. Native Anthropic SDK support with tool use and vision capabilities.

Anthropic API

Streaming: Real-time response streaming
Vision: Image input with base64 or URL
Tool Use: Function calling with structured outputs
Extended Thinking: Deep reasoning with Claude 3.7+
System Prompts: Via system message or parameter
PDF Support: Document analysis (Claude 3.5+)

Access Claude models through UniterRouter with full Anthropic API compatibility. Supports both native Anthropic SDK and OpenAI-compatible format.

Two API Formats: UniterRouter supports both the native Anthropic Messages API (/v1/messages) and OpenAI-compatible Chat Completions API (/v1/chat/completions). Choose based on your SDK preference.

Quick Start

import anthropic

client = anthropic.Anthropic(
    api_key="your_uniterouter_api_key",
    base_url="https://api.uniterouter.ai"
)

message = client.messages.create(
    model="claude-sonnet-4-20250514",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello!"}]
)
print(message.content[0].text)

from openai import OpenAI

client = OpenAI(
    base_url="https://api.uniterouter.ai/v1",
    api_key="your_uniterouter_api_key",
)

response = client.chat.completions.create(
    model="claude-sonnet-4-20250514",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

curl https://api.uniterouter.ai/v1/messages \
  -H "Content-Type: application/json" \
  -H "x-api-key: $UNITEROUTER_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-sonnet-4-20250514",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'

Available Claude Models

Model	Description	Context	Max Output
`claude-sonnet-4-20250514`	Latest Claude 4 Sonnet	200K	64K
`claude-opus-4-20250514`	Most powerful Claude 4	200K	32K
`claude-3-7-sonnet-20250219`	Claude 3.7 Sonnet with extended thinking	200K	128K
`claude-3-5-sonnet-20241022`	Claude 3.5 Sonnet	200K	8K
`claude-3-5-haiku-20241022`	Fast and affordable	200K	8K
`claude-3-opus-20240229`	Claude 3 Opus	200K	4K
`claude-3-haiku-20240307`	Previous Haiku	200K	4K