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Cline is an agent in VS Code. It connects as OpenAI Compatible.
1

API Provider

In Cline’s settings, choose OpenAI Compatible.
2

Base URL and key

  • Base URL: https://api.ethereal.llc/v1
  • API Key: eth-...
3

Model ID

Specify claude-sonnet-4-6 (or claude-opus-4-8 / claude-haiku-4-5).
For agentic tasks that edit files, claude-sonnet-4-6 works well; leave complex architecture to claude-opus-4-8.