OpenRouter — Unified API for 200+ AI Models

Features

• 200+ models from OpenAI, Anthropic, Google, Meta, Mistral, Cohere, etc.
• OpenAI-compatible — drop-in replacement, change one line of code
• Automatic fallbacks — if a model is down, route to alternatives
• Usage-based pricing — pay per token, no subscriptions
• Rate limiting — built-in handling across providers

Usage with Python

from openai import OpenAI

client = OpenAI(
    base_url="https://openrouter.ai/api/v1",
    api_key="sk-or-...",
)

response = client.chat.completions.create(
    model="anthropic/claude-sonnet-4-20250514",
    messages=[{"role": "user", "content": "Hello"}],
)

FAQ

Q: What is OpenRouter? A: Single API to access 200+ AI models from OpenAI, Anthropic, Google, Meta, Mistral, and more. OpenAI-compatible format, automatic fallbacks, and usage-based pricing.

Q: How do I install OpenRouter? A: Check the Quick Use section above for step-by-step installation instructions. Most assets can be set up in under 2 minutes.