Yes, I used Claude Sonnet 4.5 via Github Copilot in VS Code to develop FluidTouch.
I am paying for it via Github Copilot Pro at $10/month plus I have it allow up to an additional $20/month based on usage. You can’t use “premium” models like Claude Sonnet with the free plan. I probably spent about $40 on it to develop FluidTouch.
Note that purchasing AI usage is weird. I think you can use Claude Sonnet models for free direct from Anthropic (makers of Claude) but I think that just lets you do it in browser. To get “Claude Code” from them, you need to pay $20/month which is again for some amount of usage. With that and what I’m using, it can literally create/update/read/explain code files for you, write documentation, and even run things in the terminal (with permission).
With Github Copilot, different models cost different “multipliers”. Claude Haiku 4.5 is 0.33x, Claude Sonnet 4.5 is 1x, and Claude Opus 4.5 (brand new) is promotionally 1x but will be 3x. You can also access ChatGPT models, and Gemini models, and others.