ForecastUpstagelanguage model

Solar Pro 4.1 has not been announced. Based on how often Upstage ships new versions, our forecast is that it arrives around February 21, 2027, probably between December 5, 2026 and June 18, 2027.

The forecast

Most likely	February 21, 2027
Window	December 5, 2026 to June 18, 2027
Chance it arrives in that window	About 30%
Follows	Solar Pro 4 (out August 10, 2026)
Based on	1 earlier gap between versions

How we got this

Upstage is the maker of Solar Pro 4. We look at the gaps between its earlier versions (Solar Pro 3, 2026-01-27; Solar Pro 4, 2026-08-10) and project the next one. It is a guess from a pattern, not news: the maker has not said Solar Pro 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.