A landmark investigation by consumer group Which? has revealed alarming flaws in major AI platforms like ChatGPT, Gemini, and Microsoft Copilot. Across 40 essential consumer questions—ranging from financial and legal issues to health and travel—AI responses were frequently inaccurate, unclear, or potentially harmful. ChatGPT scored just 64%, with Meta AI faring even worse at 55%. Only Perplexity exceeded 70%, leading the pack in utility and accuracy.