Start with what the GM Omega platform is: a 4-door Sedan (car) / sedan with 2.0 L GM Ecotec engine, built from 2016 to 2023, as electrification stopped being an experiment and the crossover took every market. What it meant takes a little longer.
How it came about
The GM Omega platform is a vehicle architecture designed by General Motors for full-size, rear-wheel and all-wheel drive luxury vehicles. The platform architecture was developed for Cadillac, and subsequently debuted in the 2016 Cadillac CT6 sedan.
The hardware
The engine is 2.0 L GM Ecotec engine; other versions carried different engines, listed in the specification table below. Drive goes through a 8-speed GM 8L45 transmission / Hydra-Matic 8L45 automatic / 8-speed GM 8L90 transmission / Hydra-Matic 8L90 automatic. The wheelbase is 3106 mm. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Family and rivals
In the GM (General Motors) line-up the GM Omega platform has a clear place: it replaced the GM Zeta Platform (Fullsize) / GM G platform; it handed the line to the GM VSS-R; the factory was Detroit. The cars a buyer would have weighed it against include the Chevrolet Bolt, the Ferrari 488, the Tesla Model 3. Its GM (General Motors) stablemates include the 1955 Chevrolet and the 1957 Chevrolet.