ForecastUpstagelanguage model

Solar Mini 4.1 has not been announced. Based on how often Upstage ships new versions, our forecast is that it arrives around December 7, 2026, probably between November 7, 2026 and January 21, 2027.

The forecast

Most likely	December 7, 2026
Window	November 7, 2026 to January 21, 2027
Chance it arrives in that window	About 18%
Follows	Solar Mini 4 (out September 23, 2026)
Based on	no earlier gap to learn from, so we assume about 75 days

How we got this

Upstage is the maker of Solar Mini 4. We look at the gaps between its earlier versions (Solar Mini 4, 2026-09-23) and project the next one. It is a guess from a pattern, not news: the maker has not said Solar Mini 4.1 exists. This page turns into the launch page, with price and facts, as soon as the model shows up on OpenRouter, Hugging Face or GitHub.

Available now from Upstage

Predicted automatically by Modelcast. Not affiliated with Upstage.