Install Gemini CLI following its official instructions. Use a supported Node.js version for the release you install.

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Configure the endpoint

Set these variables in the terminal that will launch Gemini CLI: 
export GEMINI_API_KEY="YOUR_API_KEY"
export GOOGLE_GEMINI_BASE_URL="https://infistar.ai"
export GEMINI_API_KEY_AUTH_MECHANISM="bearer"
export GEMINI_MODEL="GEMINI_MODEL_ID"
gemini
In PowerShell, use $env:NAME = "value" for each variable instead. Replace both placeholders. The base address has no /v1 or /v1beta suffix; the client supplies the protocol path. Select API-key authentication when prompted. Newer releases may also expose a gateway authentication flow; use the configuration for your installed release. Upstream supports a custom Gemini base address and Bearer authentication, but Infistar has not tested every CLI release and model combination.

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Verify and save

Start with: “Reply with configuration successful. Do not read or modify files or run commands.” Check the result before allowing project actions. After verification, the variables can be stored in your private ~/.gemini/.env; do not commit the file. For 401, check the key and Bearer setting. For 404, check the root address. For an unavailable model, select an exact Gemini-capable ID from your key’s model list.