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Gemini CLI is Google’s open-source AI coding CLI, available through the gemini command.

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1. Install Gemini CLI from scratch

Already have Gemini CLI? Skip to the next section. macOS users can install with Homebrew: plaintext
Or install with npm: plaintext
Windows users should install Node.js first, then install the CLI with npm.

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2. Get your Syon API Key

Open the Syon dashboard, create an account, create an API key in the sk-... format, and copy it. You can also view the complete model list in the dashboard.

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3. Connect to Syon

Replace <your-Syon-key> with the key you copied, then paste the full block into your terminal: plaintext
After saving, you do not need to restart the terminal or run source. The next gemini command will read the configuration. When you run gemini, the “Get started” screen asks how you want to authenticate:
  1. Sign in with Google
  2. Use Gemini API Key
  3. Vertex AI
Highlight “Use Gemini API Key” and press Enter. Gemini will read the Syon API Key you configured. Press Enter again to continue. If you already selected OAuth login before, reset it with: plaintext
On the next launch, the authentication wizard will appear again. Choose Use Gemini API Key.