Anthropic Claude

Connect your Anthropic account to use Claude models in Missive.

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

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.

Setup

1

Get your Anthropic API key

Create an account at 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 with prepaid credits or a payment method.

2

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.

3

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.

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

Available models

Assistant models

Model	Best for	Speed	Quality
Claude Opus 4.6	Complex reasoning, nuanced writing, detailed analysis	Moderate	Highest
Claude Sonnet 4.5	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 4.5 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:

• 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 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 4.5.

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.

• Monitor usage in the Anthropic Console.