In mid‑October 2026 the team launched d1‑ultra, a full‑stack redesign of our decision‑model architecture.
After d1, we didn't want to chase incremental improvements.
We went back to the drawing board and redesigned it from scratch: data, model, evals, serving, all backed by ablations.
The result is d1-ultra, the world's best decision model! 🥳
d1‑ultra is multimodal and supports 44 languages.
It ranked #1 on the @ArtificialAnlys Decision Index (65) and leads all eight categories of the 112‑evaluation suite.