LOS ANGELES (AP) _ Paramount Pictures Corp. and the producers of such hits as ''Top Gun'' and ''Days of Thunder'' are going their separate ways.

The studio and producers Don Simpson and Jerry Bruckheimer agreed to split less than a year into their five-year contract because the ''environment for motion picture production has changed,'' said David Kirkpatrick, president of the Paramount Motion Picture Group.

''Our philosophy continues to focus on internal development and production control,'' Kirkpatrick said in a statement Thursday.

Simpson and Bruckheimer declined to comment.

The pair joined Paramount in February under a contract whose terms were not disclosed. Their latest movie, this summer's ''Days of Thunder'' starring Tom Cruise, cost about $63 million to produce, about $14 million over budget.

The film grossed $80 million in the United States, but Paramount reportedly has yet to turn a profit.

''Days of Thunder'' was the first movie produced by Simpson and Bruckheimer since ''Beverly Hills Cop II'' in 1987. Before that, they produced a string of hits, including ''Flashdance'' in 1983, ''Beverly Hills Cop'' in 1984 and ''Top Gun'' in 1986.