Disclosed herein are methods, systems, and computer-readable media for generating an output transcript from an input audio segment using a multi-task transformer model. In some embodiments, the transformer model can be trained to transcribe or translate audio data in multiple languages using labeled audio data. The labeled audio data can include first audio segments associated with first same-language transcripts of the first audio segments and second audio segments associated with second different-language transcripts of the second audio segments. In some embodiments, a vocabulary of the model can include special purpose and time stamp tokens. The special purpose tokens can specify tasks for the model to perform.