The main differences are the data you get back and the speed of scraping. Google Fast Search API returns only the top 10 organic and news results, leaving out ads, featured snippets, AI Overviews, and additional metadata. Google Search API delivers the full range of search page elements.
Google Fast Search API is a lightweight, high-speed version of our general Google scraper and scrapes search results in under a second, perfect for AI workflows. The complete Google Search API, on the other hand, may take longer to return results, but provides comprehensive search data, ideal for in-depth data-driven flows.