The iPad 15 doesn't exist. Currently, Apple's latest iPad models are the iPad Pro (5th generation), iPad Air (5th generation), iPad (9th generation), and iPad mini (6th generation). The chips in these ipads are as follows:
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1. iPad Pro (5th generation) : Equipped with Apple M1 chip, which is Apple's first Arm architecture chip for mobile devices, with powerful performance and efficiency.
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2. iPad Air (5th generation) : With Apple M1 chip, same as iPad Pro (5th generation).
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3. iPad (9th generation) : Equipped with A13 Bionic chip, a powerful smartphone chip with high performance and efficiency.
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4. iPad mini (6th generation) : With A15 Bionic chip, a chip designed specifically for iPhone 13, it has high performance and efficiency.
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Please note that the chips mentioned here are all configured at the time of release. Apple may introduce new chips in future models, so be sure to check the latest product specifications for accurate information.