What is amazing about the story is that the most fantastic things that occur, that people most don't believe, are absolutely true — like the Soviet mole that they allowed to operate within British war intelligence — that was all true. … We condensed the timeline, essentially. The process of breaking the code was enormously complicated in real life. So one of things we wanted to do was open up Turing's story to the audience and make a film about these complicated topics, but at the same time create a narrative that the audience understands, without insulting their intelligence. But the on a broad conceptual level, everything is true.

As quoted in "Interview: Morten Tyldum, Graham Moore of The Imitation Game" by PatrickMcD at Hollywood Chicago (11 December 2014)