Ni/YSZ or Ni/ScCeSZ cermets were promoted by up to of fluoritelike (Pr–Ce–Zr–О, La–Ce–Zr–О, and Ce–Zr–О) or perovskitelike (La–Pr–Mn–Cr–O) oxides and small (up to ) amounts of Pt group metals (Pd, Pt, or Ru). Reactivity of samples, their lattice oxygen mobility, and their ability to activate methane were characterized by temperature-programed reduction by . The catalytic properties of these samples in methane steam reforming were studied at and short contact times (10 ms) in feeds with of and steam/methane ratio of 1:3. Oxide promoters ensure stable performance of cermets in stoichiometric feeds at by suppressing carbon deposition. Copromotion with precious metals enhances performance in the intermediate temperature range due to more efficient activation of methane. Factors determining specificity of these cermet materials’ performance (chemical composition, microstructure, oxygen mobility in oxides, interaction between components, and reaction media effect) are considered. The most promising systems for practical application are Pt/Pr–Ce–Zr–O/Ni/YSZ and Ru/La–Pr–Mn–Cr–O/Ni/YSZ cermets demonstrating a high performance in the intermediate temperature range under broad variation in ratio.