Swiss startup says its AI weather forecaster beats Microsoft, Google

Swiss startup Jua has launched an AI weather model it says outperforms leading systems from tech giants — potentially making it the most accurate forecaster in the world.

Jua claims its model — dubbed EPT-2 — is faster and more accurate than both Microsoft’s Aurora and Google DeepMind’s Graphcast. In separate, peer-reviewed studies, both of those models were shown to be more accurate than the European Centre for Medium-Range Weather Forecasts (ECMWF)’s ENS forecast, widely regarded as the world leader.

Jua backs up its bold claims with a new report, published today, that puts EPT-2 head-to-head with top-tier models — including Aurora and two of ECMWF’s best: ENS and IFS HRES.

According to the paper, EPT-2 came out on top, delivering the most accurate forecasts across the board. It beat Aurora on key variables like 10-metre wind speed and 2-metre air temperature over a 10-day period, ran forecasts 25% faster ...