GM sharply increased the price of its luxury cars.

The auto maker said some models in its newest line of 1986 cars will cost nearly $4,000 more each than the 1985 versions. The cars, marketed in the sports-luxury category and sharing the same basic body and platforms, are the Cadillac Seville and Eldorado, Oldsmobile Toronado and Buick Riviera. The 1985 figures are quoted in the industry periodical Edmund’s New Car Prices. Officials at GM’s Cadillac and Buick divisions confirmed Edmund’s numbers, but Oldsmobile officials did not return telephone calls. The most expensive will be the Seville, carrying a suggested retail price of $26,756. That is a $3,497, or 15%, increase from the introductory price of $23,259 for the 1985 Seville.