The perovskite-type oxides GdCo_xFe_1−xO₃ (x = 0; 0.2; 0.5; 0.8; 1) synthesized by the sol–gel method were tested as catalysts in the dry reforming of methane to syngas between 500 and 950 °С at atmospheric pressure. Thermal analysis (TG and DSC coupled with MS) and phase analysis (X-ray diffraction) were used for the synthesis parameters control. The morphology and surface area were determined by BET and SEM methods. The highly crystalline, homogeneous and pure solids with well-defined structures were prepared. The mixed GdCo_xFe_1−xO₃ (x = 0; 0.2; 0.5; 0.8; 1) structure belongs to an orthorhombic crystal system with a space group of Pnma (62). The partial substitution of Fe by Co leads to the increase of the catalytic activity. in the row: GdFeO₃ < GdFe_0.5Co_0.5O₃ < GdCoO₃ ⩽ GdFe_0.8Co_0.2O₃ ≈ GdFe_0.2Co_0.8O₃. An additional point is that the presence of Co in B-site suppresses secondary reactions such as reverse water gas-shift without slowing the dry reforming reaction, which produces syngas in a ratio close to 1. [Figure not available: see fulltext.]