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We explore the possibility of detecting the first galaxies with the nextgeneration Origins Space Telescope (OST) by applying an analytical model ofprimordial dust emission. By analysing source densities as a function ofredshift (z), and considering deep-field exposures with the Origins SurveySpectrometer, we estimate that the redshift horizon for detecting oneindividual source would be above z~7 for systems with dust-to-metal ratioshigher than those expected for typical primeval galaxies. On the other hand, ifconfusion limits could be overcome, the Far-infrared Imager and Polarimeterwould enable the detection of more typical fainter systems at z>7. Given thedependence of the obtained results with the properties of primeval dust, weconclude that the OST could provide important clues to the nature of theinterestellar medium in the early Universe.

Redshift Horizon for the Origins Space Telescope from Primordial Dust Emission