2 posts
Models
Per-prompt energy, training emissions and the measurements behind them.
Gemini's 0.24 Wh: what Google measured, and what it left out
Google's August 2025 paper is the only fleet-wide, methodology-backed per-prompt measurement any AI company has published. It is also a median, self-reported, and silent on training. Here is how to read it.
ChatGPT: 0.34 Wh and no methodology
OpenAI's only per-query figure is a sentence in a blog post. Epoch AI's independent estimate for GPT-4o lands close to it for short prompts and far above it for long ones. The index records both, and the difference between a number and a disclosure.