Comment by simonw

You might be able to use an even cheaper model. Google Gemini 1.5 Flash 8B is Input: $0.04 / Output: $0.15 per 1M tokens.

17 input tokens and 2 output tokens * 10 million jobs = 170,000,000 input tokens, 20,000,000 output tokens... which costs a total of $6.38 https://tools.simonwillison.net/llm-prices

As for rate limits, https://ai.google.dev/pricing#1_5flash-8B says 4,000 requests per minute and 4 million tokens per minute - so you could run those 10 million jobs in about 2500 minutes or 42 hours. I imagine you could pull a trick like sending 10 items in a single prompt to help speed that up, but you'd have to test carefully to check the accuracy effects of doing that.