ianRobinson, I didn’t know that Drafts App had an Action to allow conversations with the OpenAI GPT 4 API. Just installed and tried it. It works a treat.
https://directory.getdrafts.com/a/2RB
I think I'll settle on paying for Anthropic Claude 3 via their web interface (I'll check out the API access at some point too), and use PAYG API credits via Drafts for access to GPT 4. The GPT 4 selector in the API currently redirects to gpt-4-turbo.