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Bing Chat (now Microsoft Copilot) was the first major search engine to integrate GPT-4, offering it for free to all users. It combines the reasoning power of OpenAI’s most advanced model with the search index of Bing. This allows it to give sourced, citational answers to complex queries like "Compare the specs of the iPhone 15 vs Pixel 8." It offers three distinct conversation styles: Creative, Balanced, and Precise, allowing users to toggle between imaginative storytelling and strict factual reporting. With built-in DALL-E 3 for image generation, it is arguably the most feature-rich free AI tool available on the web today.