Anthropic's Claude models are known for their creative prose, and are popular amongst our users.
However, there currently is no way to use an Anthropic API Key directly from inside Novelcrafter. This is a limitation on Anthropic's end - and as soon there's an update we will add support for Claude!
Having a Claude Pro subscription is not the same as an Anthropic API key as they're billed differently.
The recommended alternative is to connect to OpenRouter instead. We have a video on how to connect here.