OpenRouter
A unified API that gives you access to 400+ AI models from dozens of providers through a single endpoint and API key.
What is OpenRouter?
OpenRouter is a platform that connects you to over 400 AI models from OpenAI, Anthropic, Google, Meta, and dozens of other providers through one API.
Instead of managing separate API keys and billing for each AI company, you authenticate once and get access to everything from GPT-4 to Claude to Gemini through the same endpoint.
Most builders use it to test different models quickly, set up automatic fallbacks when one provider goes down, and compare pricing across providers in real-time. It works with existing OpenAI code by just changing the base URL.
Free tier available. Paid usage is pay-as-you-go at the same rates as going direct to providers, plus a small markup.
Good to Know
Single API key accesses 400+ models from OpenAI, Anthropic, Google, Meta, and more
Automatic fallbacks switch to backup providers when your first choice fails or hits rate limits
Works with existing OpenAI SDK code by changing the base URL to openrouter.ai/api/v1
Real-time pricing comparison shows costs across all providers side-by-side
Free tier available with pay-as-you-go pricing at provider rates plus small markup
How Vibe Coders Use OpenRouter
Testing GPT-4, Claude, and Gemini side-by-side to see which works best for your use case
Setting up automatic fallbacks so your app keeps running when OpenAI goes down
Comparing costs across providers to find the cheapest model that meets your quality bar
Switching between models in production without rewriting your API integration code
Frequently Asked Questions
Related Terms
A custom interface built on top of existing AI models like GPT-4 or Claude that adds specific features, workflows, or constraints for a particular use case.
Controls how many API requests you can make in a time period to prevent abuse and keep servers stable.
A unique string that authenticates your app when it calls an API, like a password that identifies who's making the request.
The bite-sized chunks of text that AI models read and generate, like words or word fragments. They're how AI counts and processes language.
An open-source framework that lets you build AI apps by chaining together LLMs, tools, and data sources into reusable workflows.
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