I often see battles number hundreds of thousands when we talk about ancient battles both in the west and east, but while in the west modern historians seem to consider ancient historians as unreliable claiming such numbers would be impossible to maintain with ancient era logistics and so on, the same doesn't see to happen for chinese ancient battles, I once read about 600.000 while sometimes being outnumbered 10 to 1 men battles or 200.000 soldiers buried alive in ancient chinese sources and somehow this seems unlikely to me, so how reliable are they?
Both need to be taken with grains of salt, although the Chinese historical record after 400 CE or so is significantly better than the Western one. Personally, I have seen a much greater tendency to believe absurd numbers for Chinese armies in informal settings, probably because modern China's population is so large. But responsible historians of China do not take those figures seriously.