Claude Desktop uses the Anthropic Messages API. Simply point it to an Anthropic-compatible gateway.
Step 1: Enable Developer Mode
Launch Claude Desktop — no login required.
Open Help > Troubleshooting, then click Enable Developer Mode.
This will add a Developer menu to the menu bar.
Step 2: Open the Third-Party Inference Panel
From the menu bar, select: Developer > Configure Third-Party Inference...
Step 3: Enter Gateway Credentials
Set the backend to Gateway (Anthropic Compatible), then enter your credentials:
| Field | Value |
| Gateway Base URL | Copy the Anthropic URL from the homepage |
| Gateway API Key | Your Board API Key |
| Gateway Authentication Method | bearer |
Click Apply locally in the bottom-right corner to apply the configuration. You can now start a conversation.