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Moria calls it "a quiet but highly effective little film" and "one of the most unassuming and perfect of all lesser-budgeted science-fiction films". The New York Times calls it "an unpretentious science fiction film with a satiric point of view" and says it
is no "Dr. Strangelove," but it's full of surprising moments of humor and intelligence, a practically perfect movie to see when you want to go to a movie and have nothing special in mind.
1000 Misspent Hours says, "This is what all makers of mad computer movies should aspire to," and concludes,
In the final assessment, Colossus: The Forbin Project is just a high-tech dramatization of one of the oldest morals in literature: Be careful what you wish for.
SciFiPedia says that
despite its failure at the box-office and its relative obscurity today, it stands up a generation later as one of the most intelligent, unusual and thought-provoking SF films of the Cold War era.