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Gemini provides the language model, using an API key from Google AI Studio.

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Getting an API key

  1. Go to Google AI Studio.
  2. Sign in and create an API key.
  3. Pick a Google Cloud project when prompted, then copy the key.

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Adding the connection

  1. Go to Connections and choose Gemini.
  2. Paste the API key.
  3. Save.

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What you can select afterwards

Choose your models on Model Configurations. Language model — start with a flash model and move to pro only if the agent struggles with your prompt. A slow reply is heard as hesitation. See Google’s model list. Choose Vertex AI when you need Google Cloud billing, IAM controls, or data kept in a specific region.

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Troubleshooting

Confirm you copied it from Google AI Studio rather than from the Google Cloud console. A Google Cloud service account is a different credential and belongs on the Google Cloud connection.
This connection drives the language model only. Voices come from Google Cloud or Gemini TTS, each connected separately.