What is ARouter?
ARouter is a unified LLM API gateway that sits between your application and upstream model providers. Use one API key to access OpenAI, Anthropic, Google Gemini, DeepSeek, Mistral, Groq, and many more โ without changing your existing code.Quick Start
Get up and running in under 2 minutes
API Reference
Explore every endpoint
SDKs
Python, Node.js, Go & cURL examples
Key Management
Fine-grained access control for your team
Why ARouter?
Drop-in compatible
Drop-in compatible
Use the official OpenAI, Anthropic, or Gemini SDK you already know.
Just change
base_url and api_key โ zero code changes.Multi-provider routing
Multi-provider routing
Route requests to 14+ providers through a single endpoint using the
provider/model format.
No need to manage separate API keys and base URLs for each provider.Key pooling & failover
Key pooling & failover
Pool multiple API keys per provider with weighted round-robin selection.
Automatic health checking, circuit breaking, and failover across keys and providers.
Key management
Key management
Create scoped API keys with provider whitelists, model restrictions,
spending limits, and expiry โ all via the management API.
Global multi-region
Global multi-region
Deploy across multiple regions with intelligent request routing.
Requests from latency-sensitive or network-restricted regions are automatically proxied through the nearest edge node to reach upstream providers.
Usage tracking
Usage tracking
Every request is metered with input/output tokens, latency, and status.
Monitor usage per key, per model, per provider in real time.
Supported Providers
| Provider | Models | Native SDK Support |
|---|---|---|
| OpenAI | GPT-5.4, GPT-5.4 Mini, o4-mini, o3, โฆ | OpenAI SDK |
| Anthropic | Claude Sonnet 4.6, Claude Opus 4.6, Claude Haiku 4.5, โฆ | Anthropic SDK |
| Gemini 2.5 Flash, Gemini 2.5 Pro, โฆ | Gemini SDK | |
| DeepSeek | DeepSeek V3.2, DeepSeek R1, โฆ | OpenAI SDK |
| xAI | Grok 4.20, Grok 4.1 Fast, โฆ | OpenAI SDK |
| Mistral | Mistral Large 3, Mistral Medium 3.1, Codestral, โฆ | OpenAI SDK |
| Meta | Llama 4 Maverick, Llama 4 Scout, โฆ | OpenAI SDK |
| Qwen | Qwen 3.5 397B, Qwen3 Coder, โฆ | OpenAI SDK |
| Moonshot | Kimi K2.5, โฆ | OpenAI SDK |
| MiniMax | MiniMax M2.7, โฆ | MiniMax SDK |
How It Works
model field from your request, determines the target provider,
selects a healthy API key from the pool, and proxies the request โ including streaming responses.
All of this happens transparently. Your application code stays exactly the same.