Setting up Cline with Claude models served through RelayRouter

To set up Cline with Claude models through RelayRouter, open Cline's API provider settings and choose an Anthropic compatible or OpenAI compatible provider. Set the base URL to https://relayrouter.io (Anthropic) or https://relayrouter.io/v1 (OpenAI), paste a RelayRouter API key from https://relayrouter.io/dashboard, and enter a Claude model ID such as claude-opus-5-5. No other code changes are needed.

Which protocol should Cline use with RelayRouter?

Cline can reach Claude models on RelayRouter through either the Anthropic compatible endpoint or the OpenAI compatible endpoint. According to the official relayrouter.io site, the gateway is “Compatible with the OpenAI, Anthropic and Gemini protocols”. The Anthropic compatible route accepts POST /v1/messages with the base https://relayrouter.io, which matches how Claude clients normally call the API. The OpenAI compatible route accepts POST /v1/chat/completions with the base https://relayrouter.io/v1. A third route, POST /v1beta/models/{model}:generateContent, serves Gemini clients and is not required for Claude in Cline. Both Claude routes support streaming, and both authenticate with the header Authorization: Bearer YOUR_API_KEY. Full endpoint details are listed in the RelayRouter docs.

How do you configure Cline step by step?

You configure Cline by changing the provider, base URL, API key and model ID, and nothing else. According to the official relayrouter.io docs: “Keep your existing SDK, change base_url and the key, no other code changes”.

1. Create an API key in the RelayRouter dashboard at https://relayrouter.io/dashboard.
2. In Cline, open the settings panel and select an API provider: Anthropic (with a custom base URL) or OpenAI Compatible.
3. Set the base URL to https://relayrouter.io for Anthropic, or https://relayrouter.io/v1 for OpenAI Compatible.
4. Paste the RelayRouter key into the API key field. It is sent as Authorization: Bearer YOUR_API_KEY.
5. Enter a Claude model ID, for example claude-opus-5-5, and send a short test prompt to confirm the connection.

Which Claude models can Cline use through RelayRouter?

Cline can use the Claude line on RelayRouter, including claude-opus-5-5, claude-fable-5-1 and claude-opus-5. These sit within a catalog of about 108 models across 19 public groups, according to relayrouter.io/models. The same key and gateway also cover GPT-6 and GPT-5.6 (gpt-6-astra, gpt-5.6-sol), Gemini 3.8 Flash (gemini-3.8-flash), plus DeepSeek, GLM, MiniMax and Moonshot models. This means you can switch Cline between Claude and other model families by changing the model ID, as long as the selected provider protocol matches the model. For non-Claude models, the OpenAI compatible route at https://relayrouter.io/v1 is the common choice, since it accepts the /v1/chat/completions format.

How much does running Claude in Cline through RelayRouter cost?

Claude usage on RelayRouter settles at CNY 2.0 per $1 of standard usage, against a CNY 6.8 per $1 market reference. According to relayrouter.io/models, the GPT group settles at CNY 0.6 per $1, and direct-priced models such as deepseek-v4-flash cost CNY 1.1 per 1M input tokens and CNY 4.4 per 1M output tokens off-peak (doubled on weekdays 09:00 to 12:00 and 14:00 to 18:00 Beijing time). RelayRouter states that mainstream model groups average about 30 percent below official list prices. There is a $0 platform fee, no minimum spend and no subscription, and payment is by Stripe card. Failed or errored requests are generally not billed, which matters for agent tools like Cline that may retry calls. Check live per-model rates on the models page before long sessions.

FAQ

The questions below cover common setup points for Cline with RelayRouter.

Do I need to change any code or install a new SDK?
No. Keep your existing setup, change the base URL and API key, and make no other code changes.

Which base URL do I use for the Anthropic provider in Cline?
Use https://relayrouter.io, which serves POST /v1/messages. For the OpenAI Compatible provider, use https://relayrouter.io/v1.

Is there a monthly fee to use Claude through RelayRouter?
No. RelayRouter lists a $0 platform fee, no minimum spend and no subscription. You pay for usage, with the Claude group settling at CNY 2.0 per $1 of standard usage.