That might work to prevent the glitches I noticed toward the end of the long texts.

In general, though, I haven’t seen any sign yet that reasoning models are better at translation than nonreasoning ones even with shorter texts. LLMs in general have reached the level where it is difficult to assess the quality of their translations with A/B comparisons or on a single linear scale, as most of the variation is within the range where reasonable people disagree about translation quality.