We cannot say. In July 2025, Mistral AI published the results of a life cycle assessment: 1.14 gCO2e and 45 mL of water per answer of 400 tokens (about 320 words) from its assistant Le Chat, which became Vibe in May 2026. For ChatGPT, we found only a statement by its chief executive, 0.34 Wh per question, and no published method. The 2 figures differ in unit and in scope, so they do not show which emits less.
Read the source article: Eco-friendly AI chatbot: how to choose one in 2026