According to Osho, Krishna is a Brahmin—not by birth, but by realization. Though born a Kshatriya, that is merely an accidental, formal label. A true Brahmin is one who knows Brahman, the ultimate truth; by this criterion Krishna—and sages like Buddha, Mahavira, Moses, Jesus, Lao Tzu—are Brahmins. Being transcends caste, nation, religion, and color.
Krishna is called a ‘Brahmin’ because he realized the ultimate truth, not because of his birth; real identity comes from awareness, not labels.