Anthropic · released 2026-09-22
Not known yet. Claude Opus 5.5 was released on 2026-09-22, and it is too new for an energy figure. Independent testers at Epoch AI have published 2 early results, but not the overall score our energy estimate is built from. Any figure now would be a guess, so we show none. It fills in by itself when the score does.
How much energy an AI model uses depends mostly on how big it is. Anthropic has not published the size of Claude Opus 5.5, and neither has anyone else. For models like this we estimate the size from how capable the model is, using the independent test scores from Epoch AI. Those are not out yet for this one. Until they are, a figure would be made up, and every other number on this site is calculated the same careful way.
This page is rebuilt every night. When the scores arrive, the full figure appears here, at this same address, with no action needed.
Of the 24 models from Anthropic that we track, 10 can be assessed at all. The rest publish too little for anyone outside the company to calculate anything.
See the 270 models we can already measure, lightest first, or compare any two of them.