The best free AI chatbot available today is ChatGPT. Developed by OpenAI, ChatGPT is an AI-powered language model that can generate human-like text based on context and past conversations. It has been praised for its ability to understand and respond to complex questions, and its versatility in generating text for a wide range of topics. ChatGPT has a large conversation memory, allowing it to maintain context and coherence in longer conversations. Additionally, it has been trained on a diverse range of text sources, which contributes to its ability to provide accurate and relevant responses. Overall, ChatGPT is a highly capable and widely used AI chatbot that is available for free to the public.