Google Gemini

Connect your Google AI account to use Gemini models in Missive.

Connect your Google AI account to use Gemini models for the assistant, prompts, and AI rules.

You need a Google AI Studio API key, not a Google Cloud Vertex AI key. Google AI Studio is the consumer/developer API for Gemini.

Setup

1

Get your Google AI API key

Go to Google AI Studio and sign in with your Google account.

Click Get API key and create a new key. Copy it somewhere safe.

2

Add the integration in Missive

In Missive, go to Settings > Integrations > click Add integration > search for Gemini and click Add to Missive.

Enter your API key and click Add.

3

Share with your team (optional)

To let your team use AI features, share the integration:

Go to Settings > Integrations > Gemini and click Share integration at the top.

Shared integrations mean everyone uses the same API key. All usage bills to your Google AI account.

Available models

Assistant models

Model	Best for	Speed	Quality
Gemini 2.5 Pro	Complex reasoning, long-context analysis	Moderate	Highest
Gemini 2.5 Flash	Most daily tasks, good balance of speed and quality	Fast	Good
Gemini 2.5 Flash Lite	Quick tasks, lowest cost	Fastest	Basic

For drafting customer-facing email replies, Gemini 2.5 Pro gives the best results. Gemini 2.5 Flash is great for most daily tasks, and its large context window handles very long threads well.

Rule models

Model	Description
Gemini 2.5 Flash	Fast, cost-effective for classification and routing tasks

Data privacy

Google's data handling depends on whether you are on the free or paid tier:

• Free tier (unpaid quota): Google uses your prompts and responses to improve its products and train models. Human reviewers may read your data. Do not submit sensitive or confidential information on the free tier.

• Paid tier (billing account active): Google does not use your prompts or responses to improve products. Data is logged for a limited period only to detect policy violations.

To use the paid tier, make sure your Google AI Studio account is linked to a Google Cloud project with an active billing account.

For full details, see the Gemini API terms of service.

Cost and usage

Google AI offers a free tier with usage limits, and a paid tier for higher volume. A token is roughly 3/4 of a word. Check Google AI pricing for current rates.

Reading a 10-email thread and drafting a reply typically uses 2,000 to 4,000 tokens. At that rate, even heavy daily use of the assistant stays well under a dollar per day with Gemini 2.5 Flash.

Managing costs

• Use the best model for manual tasks. When you trigger AI yourself (drafting a reply, asking the assistant a question), the cost per interaction is negligible. Use Gemini 2.5 Pro for the best results.

• Use Flash for AI rules. Rules run automatically on every matching message, so costs add up. Gemini 2.5 Flash is fast and cheap for classification and routing.

• Monitor usage in the Google AI Studio console.

• The free tier may be sufficient for small teams with light usage.