Worldwide, except S10 Lite: Samsung Exynos 9 Series 9820
USA, Canada, Hong Kong, China, Japan, Latin America (Except Brazil), and S10 Lite: Snapdragon 855
CPU
Exynos: Octa-core (2x2.73 GHz Mongoose-M4, 2x2.31 GHz Cortex-A75 and 4x1.95 GHz Cortex-A55)
Snapdragon: Octa-core (1x2.84 GHz, 3x2.42 GHz and 4x1.8 GHz) Kryo 485