Finding the Most Cost-Efficient API for Sustainability Tasks

Hi everyone, I am trying to find a way in which I use my credits in the most effective way. Right now I use quite some steps with OpenAi (already reduced to the mini o4 model to save credits) for relative simpel tasks such as ""Look at the website domain, LinkedinPage and find out if the company has any sustainability related activities" I am looking for the 'most cost-efficient' API to take a subscription. What do you guys recommend? Claude? OpenAI? something else?