What is the cheapest LLM you have found to do research (not creative) tasks? This agent would need to use tools like web searching and web scraping and be able to follow directions well. I have tried gpt-4o-mini and it does not seem to follow directions very well and does not seem to want to scrape websites although it will do an ok job of searching the web with serper. Gpt-4o does a better job, but is more expensive. What is your experience?