Is there a good summary of a) price trends for each AI platform and b) price comparison between platforms ? I have not used any of the platforms truly profess

Is there a good summary of a) price trends for each AI platform and b) price comparison between platforms ? I have not used any of the platforms truly professionally, but I have not as of yet had to pay anything to claude or qwen3. I am paying $20 per month to Google for some combination of AI tools, but that's fairly affordable.