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Gemini Connection Guide

Gemini connection uses the API Key method. Issue a key in Google AI Studio and paste it into the Gemini settings of the app. Usage fees occur in your own Google account.

※ Logging into the app (Google account) is separate. It is for your Kizuna account and does not replace the Gemini API key.

Google AI Studio / Kizuna Desktop screens may change with updates.

* Screenshots are shown in Japanese.

What is Gemini? How is it used in the app?

Gemini is Google's generative AI. In Kizuna Desktop, it is mainly used for the following purposes (varies by settings and situation):

  • Conversation: Generating responses, improving naturalness and consistency of interactions
  • Context-aware suggestions: Suggesting how to proceed with work or the next step
  • Image understanding (Vision): Reading images from screenshots/cameras to help understand the situation (when enabled)

※ Which data is sent depends on your settings. Data handling (e.g., use for training) may differ between Google's free and paid tiers.

API Key Method

How to issue a key in Google AI Studio and paste it into the app (standard connection method).

What is an API Key?

It is a "key" for Kizuna Desktop to access Gemini. You paste the created key into the app to use it.

Difference between Free and Paid Keys (Recommended: Paid)

In the free tier, sent content and answers may be used for product improvement. In the paid service, it is stated that prompts and answers are not used for product improvement (training, etc.).

Reference: Gemini API Additional Terms of Service
Free Tier: Issuing and Pasting API Key
  1. Google AI Studio (API Keys) and go to API Keys.Google AI Studio API Key Screen
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  2. Click "Create API key" at the top right.Create API Key button
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  3. Choose a key name or project you want to import and press "Create key" (anything is basically OK).Create Key Dialog
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  4. Copy the displayed API key (you can also use the copy button on the list screen).Copy button
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  5. Launch Kizuna Desktop and log in with your Google account.Login screen
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  6. Paste the copied API key into the "Gemini/API Key" settings screen in the app.API Key input field
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  7. After choosing a model, press the "Confirm settings and enable" button to proceed.Model selection and enable button
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You can reconfigure it anytime from "Gemini/API Key Settings" in various settings even after the initial setup.

Paid Tier: Payment Settings and API Key
  1. First, create an API key from Google AI Studio (API Keys) following the same steps as the free tier.API Key list
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  2. Click "Set up billing" in the guidance displayed after creating the key.
  3. Select your country, agree, and click continue.Country selection
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  4. Enter contact information (name, address, etc.) and submit.Contact info
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    Submit button
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  5. Add a payment method (card) and save.Add payment method
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    Key Point
    When billing setup is complete, "$300 worth of credits" valid for 90 days may be granted (conditions vary by period). Credits are consumed preferentially, and basically no payment occurs until they are used up.
  6. Rarely, the setting process may not finish. In that case, close it once and press "Set up billing" again to proceed.
  7. Once billing setup is complete, copy the API key and paste it into Kizuna Desktop (same as free tier).
  8. After choosing a model, press the "Confirm settings and enable" button to proceed.Model selection and enable button
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If the billing screen UI has changed, you can also refer to the Billing Guide (via Billing menu). Billing Guide (via Billing menu)

Supplement (Usage, Limits, Credit Confirmation, etc.)
Usage can be checked in Google AI Studio

You can check current usage and cost limits (budget) from "Usage" in the left menu.

Usage screen
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"¥250" etc. display is not the amount charged

It refers to the "Tier (usage limit)" on the Cloud side, so please rest assured it is not the charged amount.

Tier display
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You can move to "Detailed Billing Settings" from Kizuna Desktop

You can move to the Google Cloud detail screen from "Detailed Billing Settings (Paid Version)" in "Gemini/API Key Settings".

Detailed billing settings button
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More detailed billing information can be checked in Google Cloud
Google Cloud billing overview
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You can check credits (free tier)
Credits list
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Credit period
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Setting a "limit (budget)" is recommended if you are worried about costs
Budget setting
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