DETROIT — Chrysler said Monday that its third-quarter profit rose 80 percent on the strength of new models, less debt, and steadily growing sales in both US and international markets.

The third-largest Detroit carmaker said that it earned $381 million in net income, up from $212 million in the same period a year ago. Revenue for the quarter was $15.5 billion, an 18 percent increase from $13.1 billion in the same period last year.