openrouter lets you use almost every llm on this planet.
using mistral medium results into 3x less costs for axiom and us.
you link your OR with axiom and then a cheap and good llm like mistral medium can write the text instead using google sheets.
OpenRouter dev here - happy to help! you can email support
at openrouter.ai. Also, we have OAuth support, where users can pay for their own LLMs instead of axiom, if that helps