OpenRouter

One API for many language models, including a rotating selection of free models.

llmgateway
Websiteopenrouter.ai
CategoryAI & machine learning
PricingFreemium
Card requiredNo
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ABOUT

What is OpenRouter?

OpenRouter provides a unified API gateway that routes requests to hundreds of language models from OpenAI, Anthropic, Google, Meta, Mistral and many others. You write one integration and can switch models by changing a single parameter. It also maintains a list of free model tiers contributed by providers, making it useful for experimenting with models that have no direct free API.

BEFORE YOU SIGN UP

What you should know

✓
Hundreds of models through one API keySwitch between GPT-4o, Claude, Gemini, Llama, Mistral and hundreds of other models by changing a single model ID parameter. No separate API keys or SDKs per provider.
✓
Free model tier from multiple providersOpenRouter maintains a curated list of models with free request quotas. Useful for accessing models that do not offer a direct free API.
△
Free model availability changesFree models are contributed by providers and can be removed or rate-limited without notice. Do not depend on a specific free model for production without a fallback.
✕
Proxy adds latencyRouting through OpenRouter adds approximately 100–300ms to each request compared to calling a provider directly. Not ideal for latency-sensitive applications.

COMMUNITY

From the forums

OpenRouter is widely used among AI application developers on GitHub and r/LocalLLaMA as a fallback and routing layer. The ability to switch models without code changes and to access models with no direct free API is the primary value cited. The main criticisms are latency overhead from the proxy layer (adds 100–300ms), the rotating nature of free model availability (models come and go) and pricing complexity from managing credits across many model providers.

— Community sentiment

💬Discuss on Reddit ↗

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ABOUT US

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No paid placements. Just a clear look at what this does, what it costs, and what to know before you commit.

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FAQ

Questions, answered.

Is OpenRouter a replacement for direct provider APIs?＋

It is a complement, not a replacement. OpenRouter is ideal for multi-model experimentation, fallback routing and accessing models without direct free tiers. For production, calling the provider directly is lower latency and has clearer SLAs.

How does OpenRouter handle API key security?＋

You fund an OpenRouter account with credits and use an OpenRouter API key in your application. Your provider API keys are never exposed to end users.