Docs / Integrations / Cline

Cline and Roo Code with RelayRouter

Cline and its fork Roo Code are VS Code coding agents that accept any OpenAI-compatible or Anthropic-compatible endpoint. RelayRouter offers both, so you can choose the provider type that matches the group your key belongs to.

#Option A: OpenAI Compatible provider

Field	Value
`API Provider`	OpenAI Compatible
`Base URL`	`https://relayrouter.io/v1`
`API Key`	A RelayRouter key for an OpenAI-protocol group
`Model ID`	Exact id from the models page, for example gpt-6-astra

#Option B: Anthropic provider with a custom base URL

Field	Value
`API Provider`	Anthropic
`Use custom base URL`	`https://relayrouter.io`
`Anthropic API Key`	A RelayRouter key for a Claude group
`Model`	claude-sonnet-4-6, claude-opus-5-5 or any Claude id in the group

Prompt caching and extended thinking toggles in Cline are passed through unchanged. The Claude groups on the models page differ in rate; the group you pick when creating the key decides the price.

#Verify the key

terminalbash

curl https://relayrouter.io/v1/chat/completions \
  -H "Authorization: Bearer sk-your-relayrouter-key" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-sonnet-4-6","messages":[{"role":"user","content":"ping"}]}'

#Troubleshooting

Symptom	Fix
`401`	Wrong or disabled key, or empty balance
`404`	Model not in the key's group, or the provider type does not match the group's protocol
`Context window errors`	Set the model's context size in Cline to the value your model supports; long tasks are cheaper on a Fast group

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