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74741. Install Claude Desktop from [claude.com/download](https://claude.com/download).
75752. Launch the app. **Do not sign in or create an Anthropic account.** From the macOS menu bar (or on Windows, the application menu ☰ in the top-left of the login screen), go to **Help → Troubleshooting → Enable Developer Mode**, then **Developer → Configure Third-Party Inference…** to open the [in-app configuration window](/docs/third-party/claude-desktop/in-app-configuration).
76763. Enter the provider, endpoint, and credential values supplied by your administrator.
774. Click **Apply locally**. The app relaunches and the sign-in screen now offers the option to start in Claude Desktop on 3P using the configuration you entered.
774. Click **Apply Changes**, then click **Save & Restart**. The app relaunches and the sign-in screen now offers the option to start in Claude Desktop on 3P using the configuration you entered.
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7979The configuration is written to the application's local config file and applies only to that device and user account. It can be edited from the same window at any time. To return to standard Claude Desktop, choose the Anthropic sign-in option on the sign-in screen instead.
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