Despite a few scattered reports suggesting otherwise, it is abundantly clear the Galaxy S23 series will exclusively use the Snapdragon 8 Gen 2. The rumoured Exynos 2300 that would have powered a flagship is now relegated to mid-range devices, such as the Galaxy Tab S8 FE and Galaxy S22 FE. However, the Qualcomm-only era for the Galaxy S series could be short-lived.
South Korean tipster Vampire King says over at Meeco that Samsung MX has already approved the Exynos 2400 (codenamed Root), and its mass production will begin in November 2023. The leaker adds South Korean variants of next year's Galaxy S24 will be powered by the Exynos 2400. It is important to note the Exynos 2400 isn't the Galaxy-exclusive chip developed by Samsung's "Dream Team". That SKU is supposedly earmarked for the Galaxy S25 and is expected to enter mass production in 2025, presumably as an answer to the Snapdragon 8 Gen 4's Nuvia cores.
That said, the Exynos 2400 follow the Snapdragon 8 Gen 2's quad-cluster design with a prime Cortex-X4 core, two clusters of Cortex-A720 cores and four Cortex-A510 cores. It is difficult to zero in on the exact number of Cortex-A720 cores (and the total CPU cores, for that matter) due to conflicting information provided by the same source. One rumour states it will feature eight (1+4+3) CPU cores while another one ups that figure to ten (1+2+3+4). The AP will supposedly be fabricated on Samsung's 4LPP node. SFI's cutting-edge 3GAP node seems to be reserved for the Exynos 2500.