This article details Google's various Gemini AI models, explaining the strengths and best use cases for each, including Gemini 1.5 Flash, Gemini 1.5 Pro, Gemini 2.5 Flash (Experimental), Gemini 2.5 Pro, Deep Research with Gemini 2.5 Pro, and Personalized Gemini. It also provides prompt examples for effective usage, noting that many models are currently free.