Fugu Ultra v2.1 release date
ForecastSakanalanguage model
Fugu Ultra v2.1 has not been announced. Based on how often Sakana ships new versions, our forecast is that it arrives around November 25, 2026, probably between October 30, 2026 and January 9, 2027.
The forecast
| Most likely | November 25, 2026 |
|---|---|
| Window | October 30, 2026 to January 9, 2027 |
| Chance it arrives in that window | About 18% |
| Follows | Fugu Ultra v2 (out September 11, 2026) |
| Based on | no earlier gap to learn from, so we assume about 75 days |
How we got this
Sakana is the maker of Fugu Ultra v2. We look at the gaps between its earlier versions (Fugu Ultra v2, 2026-09-11) and project the next one. It is a guess from a pattern, not news: the maker has not said Fugu Ultra v2.1 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 Sakana
Fugu Ultra v2Sakana · language model
Sep 11, 2026released
Fugu MaxSakana · language model
Sep 11, 2026released
Sakana NamazuSakana · language model
Aug 11, 2026released
Fugu UltraSakana · language model
Jun 24, 2026released
Predicted automatically by Modelcast. Not affiliated with Sakana.