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The GOLF instrument on board SoHO has been in operation for almost 25 yearsbut aging of the instrument has now strongly affected its performance,especially in the low-frequency p-mode region. At the end of the SoHO mission,the ground-based network BiSON will remain the only facility able to performSun-integrated helioseismic observations. Therefore, we want to assess thehelioseismic performances of an \'echelle spectrograph like SONG. Indeed, thehigh precision of such an instrument and the quality of the data acquired forasteroseismic purpose calls for an evaluation of the instrument ability toperform global radial-velocity measurements of the solar disk. Data acquiredduring the Solar-SONG 2018 observation campaign at the Teide Observatory areused to study mid- and low-frequency p modes. A Solar-SONG time series of30-day duration is reduced with a combination of the traditional IDL iSONGpipeline and a new Python pipeline described in this paper. A mode fittingmethod built around a Bayesian approach is then performed on the Solar-SONG andcontemporaneous GOLF, BiSON, and HMI data. For this contemporaneous timeseries, Solar-SONG is able to characterise p modes at a lower frequency thanBiSON and GOLF (1750{\mu}Hz against 1946 and 2157 {\mu}Hz respectively), whilefor HMI it is possible to characterise a mode at 1686 {\mu}Hz. The decrease ofGOLF sensitivity is then evaluated through the evolution of its low-frequencyp-mode characterisation abilities over the years. [abridged]

No swan song for Sun-as-a-star helioseismology: performances of the Solar-SONG prototype for individual mode characterisation