LetterBucket’s writing assistant can use your own AI provider API keys instead of the built-in AI. This gives you full control over which model you use and how costs are handled.
Go to Settings → Profile → API Keys to manage your keys.
Supported providers
| Provider | Key format |
|---|
| OpenAI | Starts with sk- or sk-proj- |
| DeepSeek | Starts with sk- |
| OpenRouter | Starts with sk-or-v1- |
OpenRouter is a good choice if you want access to many different models (including Claude, Gemini, Llama, and others) through a single API key.
Adding an API key
- Go to Settings → Profile → API Keys.
- Select your provider.
- Paste your API key. LetterBucket validates the key format before saving.
- Save.
Once saved, the writing assistant in the editor will use your key for AI-powered features.
Using the writing assistant
With a key connected, you can access AI assistance directly in the post editor:
- Select any text and use the AI actions in the formatting toolbar.
- Use the
/ insert menu to trigger AI-powered content generation.
- The assistant can help you rewrite, expand, summarize, or improve your writing.
Removing a key
Click Delete next to any key to remove it. The writing assistant will fall back to LetterBucket’s built-in AI if it’s available on your plan.
Your API keys are stored securely but treat them like passwords — don’t share them. If a key is compromised, revoke it in your provider’s dashboard and add a new one here.
