No brand is inherently low-energy or power-hungry: it depends on the model. A median Gemini query uses around 0.24 Wh (a figure published by Google), and a small model such as Claude Haiku is in the same low range, at about 0.22 Wh. GPT-4o, ChatGPT's default model until GPT-5 arrived in August 2025, was estimated at around 0.43 Wh; OpenAI has published no per-query figure for the GPT-5 family that replaced it.
Read the source article: Which AI uses the least energy? ChatGPT vs Claude vs Gemini