Quick answer: Gemini Ultra (Gemini 1.0 Ultra) was Google's flagship model from its original Gemini family, launched via Gemini Advanced in February 2024, and was Google's most capable model until the Gemini 1.5 generation arrived.
Where Gemini Ultra leads
Where it lags
Best for: historical/comparison baseline in benchmark literature from early-to-mid 2024.
Gemini Ultra (Gemini 1.0 Ultra) is the flagship, largest model in Google's original Gemini family, made available to consumers via Gemini Advanced starting February 2024. It was Google's most capable model at the time, used as the top-tier comparison point in benchmark papers such as Google DeepMind's own LongFact factuality study, before being superseded by the Gemini 1.5 model family.