GESIS OpenCode Desktop Installer

This repository provides a Windows installer for OpenCode Desktop configured for the GESIS AI Server.

The installer is intended for GESIS colleagues who want to use OpenCode with their personal GESIS AI Server API key. It downloads the latest OpenCode Desktop for Windows, checks the API key, shows the models available to that key, and writes the OpenCode configuration automatically.

Download

Download and run:

GESIS-OpenCode-Installer.exe

Windows may show a security warning because the installer is not code-signed yet. If you downloaded it from the official GESIS GitLab project, choose More info and then Run anyway.

Before You Start

You need:

• Windows 10 or Windows 11
• internet access
• access to the GESIS AI Server / Open WebUI
• your personal GESIS AI Server API key

Do not share your API key. The installer stores it only in your own OpenCode configuration.

Get Your API Key

Open the GESIS Open WebUI page:

https://ai-openwebui.gesis.org

1. Sign in to Open WebUI.
2. Click your profile icon in the top-right corner.

3. Choose Settings.

4. Open Account.
5. Find API keys and click Show.
6. Create or copy your personal API key.

If you cannot see API keys, contact the GESIS AI Server / Open WebUI administrators.

Install OpenCode

1. Run GESIS-OpenCode-Installer.exe.
2. Paste your personal API key.
3. Click Check API key.
4. Select the models you want to use in OpenCode. All available models are selected by default.
5. Click Install selected models.
6. Follow any OpenCode Desktop installer prompts that appear.

When finished, start or restart OpenCode Desktop.

What the Installer Does

The installer:

• downloads the latest Windows x64 OpenCode Desktop release
• checks your API key against the GESIS AI Server
• shows only models available to your API key
• writes the selected models to your OpenCode configuration
• disables the default OpenCode/Zen providers so the model list stays focused on GESIS
• backs up an existing OpenCode config before replacing it

The config is written to:

%USERPROFILE%\.config\opencode\opencode.json

Troubleshooting

If the API key is rejected, create a new API key in Open WebUI and try again.

If no models are shown, your key may not have access to any models yet. Contact the GESIS AI Server / Open WebUI administrators.

If OpenCode still shows old models, close and restart OpenCode Desktop.

If Windows blocks the installer, make sure you downloaded it from the official GESIS GitLab project.

For Maintainers

Build instructions and source files are included in this repository.

To rebuild the EXE on Windows:

Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass
.\Build-GuiInstaller.ps1

Release/versioning rules are documented in RELEASE.md. Use simple tags such as v1, v2, v3, and create a new version only when the distributable EXE changes and the project owner explicitly approves the bump.

GitLab release pages should be attached to an existing approved tag. Do not create a new tag just to create or edit a release page.

In GitLab, release pages are usually found under Deploy > Releases in the project sidebar. If the sidebar does not show Releases, open Code > Tags, select the existing tag such as v2, and create a release from that tag.