Tafsir Al-Mizan is deemed to be the criterion and measurement of many other commentaries including Mafatih Al-Gheyb Commentary written by Fakhr Razi which is significantly analyzed and criticized by Allameh Tabatabei. In this analysis, Allameh has three viewpoints about Fakhr Razi’s Commentary beliefs. Allameh has confirmed Fakhr Razi’s viewpoint in cases such as compliance with the verses of the Quran, compliance with narrations, compliance of Fakhr Razi’s comments with those of Allameh’s and he has also cited some statements of Tafsir Mafatih Al-Gheyb. On the other hand, Allameh has criticized and rejected Fakhr Razi’s ideas about lack of determining the correct meaning of the Quran’s words, lack of accurate attention to the rules of Arabic literature, incompatibility with the context of the verses, inattention to the relation between the verses, etc. and in some cases, he has mentioned Razi’s opinion without either confirming or rejecting the same.