How Much Energy Does Each Query to ChatGPT and Other AI Actually Consume? Grok Had the Greatest Carbon Footprint when Training

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The race to develop larger artificial intelligence models also triggered the environmental cost of the industry. Stanford's AI Index Report 2026 documented extreme differences between systems that consume tens of thousands of tons of carbon and others that manage to operate with much lower emissions levels.The most evident contrast appears in Grok 4. The model developed by xAI recorded the highest carbon footprint reported so far during its trai…