GenCast

A diffusion model that produces an ensemble of possible forecasts, so it gives odds as well as a best guess.

Made by
Google DeepMind
Field
Weather and climate
Learns from
40 years of ERA5 reanalysis
Size
Not stated
Open weights
Yes, CC BY 4.0 (weights)
First public
Dec 2023

How it relates to Flare

Uncertainty matters as much in physics as in weather; how Flare will report its own confidence is an open question.

Every figure here is from the source above, checked 17 October 2026. Something changed? Email [email protected].

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