# Anthropic Claude

Connect your Anthropic account to use Claude models for the assistant, prompts, and AI rules.

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Anthropic API access requires prepaid credits or a billing plan. A **Claude Pro subscription** ($20/month) is not the same as API access. You need a separate API key from the Anthropic Console.
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## Setup

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#### Get your Anthropic API key

Create an account at [console.anthropic.com](https://console.anthropic.com/) if you don't have one.

Go to **API Keys** and click **Create Key**. Copy the key somewhere safe. You won't be able to see it again.

Make sure you have [billing set up](https://console.anthropic.com/settings/billing) with prepaid credits or a payment method.
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#### Add the integration in Missive

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

Enter your **API key** and click **Add**.
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#### Share with your team (optional)

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

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

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Shared integrations mean everyone uses the same API key. All usage bills to your Anthropic account.
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#### Restrict available models (optional)

By default, all models are available to your team. To limit which models they can choose in the Assistant:

Go to **Settings** > **Integrations** > **Anthropic** and scroll to **Models**.

Select the models you want to make available. Choosing **All models** automatically includes any future models. Deselecting specific models prevents your team from using them.
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## Available models

### Assistant models

| Model             | Best for                                              | Speed    | Quality |
| ----------------- | ----------------------------------------------------- | -------- | ------- |
| Claude Opus 4.6   | Complex reasoning, nuanced writing, detailed analysis | Moderate | Highest |
| Claude Sonnet 4.6 | Good balance of speed and quality, most daily tasks   | Fast     | High    |
| Claude Haiku 4.5  | Quick tasks, lowest cost                              | Fastest  | Good    |

For drafting customer-facing email replies, Claude Opus 4.6 gives the best results. Claude Sonnet 4.6 is a good all-rounder for most daily tasks.

### Rule models

| Model            | Description                                               |
| ---------------- | --------------------------------------------------------- |
| Claude Haiku 4.5 | Fast, cost-effective for classification and routing tasks |

## Data privacy

By default, Anthropic does **not** use API inputs or outputs to train models. Data submitted through the API is retained for 30 days for safety monitoring, then deleted.

Review your settings at [platform.claude.com/settings/privacy](https://platform.claude.com/settings/privacy):

* **Allow user feedback** controls whether feedback on model responses (including full prompts and responses) is sent to Anthropic.
* **Development Partner Program** is an opt-in program that shares data with Anthropic for model training. Do not join if you want to keep your data private.

## Cost and usage

Anthropic bills based on tokens processed (input and output). A token is roughly 3/4 of a word. Check [Anthropic's pricing page](https://platform.claude.com/docs/en/about-claude/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 Claude Sonnet 4.6.

### 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 Claude Opus 4.6 for the best results.
* **Use Haiku for AI rules.** Rules run automatically on every matching message, so costs add up. Claude Haiku 4.5 is fast and cheap for classification and routing.
* **Set spending limits** in your [Anthropic account settings](https://console.anthropic.com/settings/limits).
* **Monitor usage** in the [Anthropic Console](https://console.anthropic.com/settings/usage).