OpenRouter is a unified API and chat interface that gives developers and businesses a single point of access to more than 400 AI language models from over 70 providers. It's built for teams building AI-powered products who don't want to manage separate accounts, billing relationships, and integrations for every model they might want to use. If you build with GPT, Claude, Gemini, Llama, DeepSeek, or dozens of other models and don't want to write separate integration code for each, this is the tool you reach for.
What does OpenRouter do?
OpenRouter acts as a routing layer between an application and the underlying AI model providers. A developer sends a request in the standard OpenAI-compatible format, and OpenRouter forwards it to whichever provider is hosting the requested model, then returns the response in the same format the app already expects.
Because OpenRouter doesn't mark up provider pricing, developers pay the same per-token rate they would get by going directly to the provider, plus OpenRouter's own platform fee on paid usage. The company says requests are billed only when a model actually returns a successful response, so failed or fallback attempts don't cost anything.
Core features
- Access to 400+ models from more than 70 providers through one API key and one OpenAI-compatible endpoint.
- Automatic routing and fallback that retries a request with a different provider if the first one fails or is unavailable.
- Prompt caching support to cut costs on repeated context across requests.
- Budgets and spend controls so teams can cap usage per project or API key.
- Data policy based routing that restricts which providers can see or log a given prompt.
- A built-in chat interface for testing models directly in the browser before wiring them into code.
- A public rankings page that tracks which models and apps are seeing the most usage.
- Bring-your-own-key support for teams that already have direct contracts with a provider.
Use cases
Teams building AI features, chatbots, coding assistants, or agents use OpenRouter so they can swap models without rewriting integration code. If a newer or cheaper model launches, or a provider has an outage, switching is a config change rather than an engineering project. This matters for anyone comparing an agent tool like claude cowork against dozens of alternative models, since OpenRouter lets a team benchmark several models against the same prompt in one place.
It also suits solo developers and small teams who want to experiment with premium models without individually signing up for OpenAI, Anthropic, Google, and half a dozen other provider accounts.
Pricing
OpenRouter has a free tier with access to more than 25 free models from 4 providers, limited to 50 requests a day. The pay-as-you-go plan requires no minimum spend: buy credits with a card, crypto, or bank transfer and pay per token at the provider's listed rate plus a 5.5% platform fee. Enterprise plans add volume-based fee discounts, SSO/SAML, dedicated rate limits, and invoicing, with pricing set individually per account.
How to use OpenRouter
- Create a free account at openrouter.ai using Google, GitHub, or a crypto wallet.
- Buy credits from the settings page, or start with the free-model tier.
- Generate an API key from the dashboard.
- Point your existing OpenAI SDK code at OpenRouter's base URL and swap in the model name you want.
- Test prompts directly in the OpenRouter chat interface before deploying.
- Set budgets, spend alerts, and routing preferences as usage grows.
Frequently asked questions
Is OpenRouter free to use?
Yes, in a limited way. The free tier gives access to more than 25 free models with a cap of 50 requests per day. Paid usage requires buying credits.
Does OpenRouter charge more than going directly to a model provider?
OpenRouter states it does not mark up provider token pricing. On the pay-as-you-go plan it adds a 5.5% platform fee on top of the provider's listed rate.
Can I use my existing OpenAI code with OpenRouter?
Yes. OpenRouter's API is OpenAI-compatible, so switching typically means changing the base URL and model name rather than rewriting integration code.
What happens if a model provider goes down?
OpenRouter can automatically route the request to a fallback provider or model, and it says customers are billed only for successful completions.
Learn more or create an account at OpenRouter.