OpenAI's reasoning o1-mini AI model, codenamed 'Project Strawberry', is now rolling out to free users of ChatGPT.o1-mini is an AI model with impressive reasoning ability, capable of solving riddles and answering equations.Free users can access o1-mini without subscribing to ChatGPT Plus, but availability is limited to select users at the moment.The exact number of prompts allowed per day for free users is currently unknown.