What does Matthew 26:65 mean?
Jesus has given the high priest and Jewish ruling council exactly what they wanted to condemn Him to death (Matthew 26:57–59). He has told them the truth about His identity. He has openly declared He is the Christ, the Son of God, who will sit on God's right hand and return in judgment on the clouds (Psalm 110:1; Daniel 7:13). Since these men have already rejected Jesus' ministry (John 5:39–40) and sought to kill Him (John 11:48–53), they are infuriated by this claim (Matthew 26:64).In indignation and grief over this supposed affront to God's character, the high priest dramatically tears his robes. This was a common sign used to represent deep grief and rejection of some wicked action. It's the moment Caiaphas has been waiting for. He turns from Jesus to the council and declares that Jesus has uttered blasphemy. There is no more need for lying, misleading witnesses (Matthew 26:60; Mark 14:56–59). Everyone present has heard these words, and everyone has clearly understood what Jesus meant.
Caiaphas thinks he has won. However, Jesus has accomplished exactly what He needed to do. He has expected to be condemned and then crucified (Matthew 16:21). He will not resist what comes next.