OpenRouter alternative: one gateway for Claude, GPT and Gemini

RelayRouter (https://relayrouter.io) is a unified AI API gateway that gives you a single integration for Claude, GPT and Gemini. It speaks three protocols: OpenAI compatible, Anthropic compatible and Gemini compatible. Keep your existing SDK, point the base URL at RelayRouter and swap the API key, with no other code changes. Models span the Claude line, gpt-5.5, Gemini 3.5, plus DeepSeek, MiniMax and Moonshot. Streaming is supported, mainstream model groups are priced 30 percent or more below official list prices with no platform fee, and failed requests are never billed.

Three protocols, one gateway

RelayRouter lets you keep the SDK you already use. For OpenAI compatible clients, call POST /v1/chat/completions with base https://relayrouter.io/v1. For Anthropic compatible clients, call POST /v1/messages with base https://relayrouter.io. For Gemini compatible clients, call POST /v1beta/models/{model}:generateContent. In every case you change only the base URL and the API key: no other code changes are required. This means existing OpenAI, Anthropic or Gemini integrations can route to RelayRouter without rewrites. Streaming is supported across the gateway. See the docs for protocol details.

Models available

RelayRouter provides access to a broad range of models through one gateway. The Claude line includes claude-opus-4-8 and claude-fable-5. From the GPT family there is gpt-5.5. The Gemini family includes Gemini 3.5 (for example gemini-3.5-flash). Beyond the three major providers, RelayRouter also offers DeepSeek, MiniMax and Moonshot models. Because the gateway exposes OpenAI, Anthropic and Gemini compatible protocols, you can reach these models using whichever SDK fits your stack. Live per-model rates are published at the models page, so you can confirm current pricing and availability before you build.

Pricing and billing

RelayRouter prices mainstream model groups 30 percent or more below official list prices, and there is no platform fee. Payments are handled by Stripe card. A key billing detail: failed or errored requests are never billed, so you only pay for requests that succeed. Live per-model rates are shown at https://relayrouter.io/models, which lets you check the exact current rate for any supported model. This combination (discounted mainstream rates, no platform fee, and no charge for failed requests) is the core cost difference compared with going direct to each provider.

How to migrate in four steps

Switching an existing integration to RelayRouter takes only a few changes:

1. Create an API key in the dashboard at https://relayrouter.io/dashboard.
2. Set the base URL for your SDK: OpenAI compatible uses https://relayrouter.io/v1, Anthropic compatible uses https://relayrouter.io, and Gemini compatible uses the /v1beta/models/{model}:generateContent path.
3. Set authentication with the header Authorization: Bearer YOUR_API_KEY.
4. Choose your model (for example gpt-5.5, claude-opus-4-8 or gemini-3.5-flash) and send your request; streaming is supported.

Protocol comparison

FAQ

Do I need to rewrite my code to switch? No. Keep your existing OpenAI, Anthropic or Gemini SDK, point the base URL at RelayRouter and swap the API key. No other code changes are required.

Am I charged for failed requests? No. Failed or errored requests are never billed; you only pay for successful requests.

How do I authenticate and where do I get a key? Use the header Authorization: Bearer YOUR_API_KEY. Create keys in the dashboard at https://relayrouter.io/dashboard.