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In Planck, open Connect your coding tools, select VS Code Chat, and choose an available qualified model. VS Code is the editor; Codex and Claude extensions have separate setup instructions.
  1. Open Manage Language Models → Add Models → Custom Endpoint.
  2. Enter the Planck credential in the API-key prompt, using VS Code secret storage.
  3. Merge Planck’s generated model configuration into chatLanguageModels.json. Keep the ${input:planckApiKey} reference rather than putting a raw key in JSON.
  4. Use the generated full endpoint URL and API type. The configuration includes model limits, tool support, bearer authentication, and a temporary setup header.
  5. Select the model in Chat, start a new conversation, and send the displayed test prompt.
  6. Wait for Planck to show the matched completed request. Remove the setup header after verification, preserving authentication and model settings.
For remote development, configure the VS Code host that runs the model provider. A successful browser gateway test does not verify this editor connection. See VS Code’s Custom Endpoint reference.