We compared the information on the CAIs melts evaporation (types A and B) with the data on the Murchison chondrite (CM2) obtained earlier. Experimental data on the evaporation of CAIs melts of types A and B were obtained by the Knudsen effusion mass spectrometry at 1300–2600 K. The studied compositions were natural inclusions of the Efremovka chondrite (CV3). It was shown that the preservation of the silicon component in CAIs residual melts of types A and B during evaporation at temperatures above 2500 K is due to the gehlenite presence, which has the maximum stability of possible silicate compounds in CAIs residual melts. Evaporation of CAIs melts of types A and B occurs with the release of a significant amount of oxygen from the melt compared to the Murchison chondrite melt. The behavior of CAIs melts during high-temperature evaporation indicates the course of the process in an atmosphere enriched with oxygen.