Wenxin Yiyan (Ernie Bot) is Baidu's flagship free AI chat platform in 2026, powered by advanced Ernie models (4.5 Turbo, X1) for multimodal tasks including text generation, image/video creation, search, and reasoning. It offers unlimited free access since 2025, strong Chinese performance, multilingual support, and enterprise API at low cost. Ideal for everyday users, content creators, and businesses needing high-quality, affordable AI assistance.