Gemini offers a free version for casual tasks and an Advanced plan for heavy...

https://www.yankee-bookmarkings.win/google-keeps-gemini-pricing-simple-by-offering-a-free-tier-for-casual-curiosity

Gemini offers a free version for casual tasks and an Advanced plan for heavy lifters. The free tier handles standard writing and planning quite well for most people. If you need more, Gemini Advanced costs $20 per month