Mass-radius diagram of transiting planets in the PlanetS catalog (Otegi et al. 2020; Parc et al. 2024) as of May 2025. The internal structure models are from Zeng et al. (2019). The location of TOI-2141 b is marked in red. For this planet, the marker size is larger than the uncertainty in the y-axis. Transiting planets with orbital periods longer than 15 days orbiting Sun-like stars (5500 K < T_eff < 5900 K) are shown in blue. Compared to similar planets, the precision in the bulk properties of TOI-2141 b is remarkable.