How to Get an Anthropic API Key
This guide will walk you through the process of obtaining an API key from Anthropic to use with Reformation AI. With an Anthropic API key, you can access Claude models like Claude Opus 4, Claude Sonnet 4, and more.
Step 1: Create an Anthropic Account
If you don't already have an Anthropic account, you'll need to create one:
- Visit the Anthropic Console
- Click on "Sign up" and follow the instructions to create your account
- Verify your email address and complete any additional verification steps
Step 2: Set Up Billing
Anthropic requires a payment method to be added before you can use the API:
- Log in to your Anthropic account
- Navigate to the Billing section
- Add a payment method (credit card or other supported payment options)
- You may need to select a plan based on your expected usage
Anthropic charges based on usage. Make sure to understand the pricing structure to control costs. You can monitor your usage in the Anthropic dashboard.
Step 3: Generate an API Key
Once your account is set up with billing, you can generate an API key:
- Navigate to the API Keys section in the Anthropic Console
- Click on "Create API Key"
- Give your key a descriptive name (e.g., "Reformation AI")
- Set any permissions or restrictions if needed
- Click "Create"
- Copy your API key immediately and store it securely (you won't be able to view it again)
Important: Your API key is sensitive information. Never share it publicly or commit it to version control. Anthropic will only show your key once when you create it, so make sure to copy it immediately.
Step 4: Add Your API Key to Reformation AI
Now that you have your Anthropic API key, you can add it to Reformation AI:
- Log in to your Reformation AI account
- Navigate to the Settings page
- Find the "API Keys" section
- Click on "Add Anthropic API Key"
- Paste your API key into the field
- Click "Save"
Once your API key is added, you'll be able to select and use Anthropic models in the chat interface.
Anthropic Pricing Information
Anthropic charges based on the number of tokens processed (both input and output). Different models have different pricing:
| Model | Input (per 1M tokens) | Output (per 1M tokens) |
|---|---|---|
| Claude Opus 4 | $15.00 | $75.00 |
| Claude Sonnet 4 | $3.00 | $15.00 |
| Claude Haiku 3.5 | $0.25 | $1.25 |
For the most up-to-date pricing information, visit the Anthropic API Pricing page .
Troubleshooting
API Key Not Working
- Ensure you've copied the entire API key correctly
- Check that your Anthropic account has a valid payment method
- Verify that you haven't reached your usage limits
- Try generating a new API key if the issue persists
Rate Limit Errors
- Anthropic imposes rate limits on API requests
- If you're encountering rate limit errors, try spacing out your requests
- Consider upgrading your Anthropic plan for higher rate limits
Next Steps
Now that you have your Anthropic API key set up, you can: