If you’re on macOS, give BoltAI[0] a try. Other than supporting multiple AI services and models, BoltAI also allows you yo create your own AI tools. Highlight the text, press a shortcut key then run a prompt against that text.
I use an app called MindMac for macOS that works with nearly "all" of the APIs. I currently am using OpenAI, Anthropic and Mistral API keys with it, but it seems to support a ton of others as well.
Disclaimer: I build it :D
[0]: https://boltai.com