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The Gaia collaboration announced the discovery of a binary of a massive black hole (33 M$_\\odot$) with a low-mass giant star (Gaia BH3) in the ED-2 stellar stream. The properties of this binary, as well as its position in the stream, challenge a formation scenario invoking only isolated binary evolution.\n  Aims. We aim to quantify the importance of cluster dynamics in the formation of Gaia BH3 in the progenitor cluster of the ED-2 stream.\n  Methods. 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The Gaia collaboration announced the discovery of a binary of a massive black hole (33 M$_\\odot$) with a low-mass giant star (Gaia BH3) in the ED-2 stellar stream. The properties of this binary, as well as its position in the stream, challenge a formation scenario invoking only isolated binary evolution.\n  Aims. We aim to quantify the importance of cluster dynamics in the formation of Gaia BH3 in the progenitor cluster of the ED-2 stream.\n  Methods. We perform detailed N-body simulations of the progenitor cluster of the ED-2 stream, including the effects of single and binary stellar e"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We determine that Gaia BH3 most likely formed as an exchange binary which underwent multiple strong dynamical interactions. 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