Developer Transition Kit (A12Z, 2020):

• 2.4 GHz 8-core Apple A12Z Bionic, 16 GB 2133 MHz LPDDR4X-4266 SDRAM, 512 GB SSD, available only on loan, discontinued February 3rd 2021.
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Mac mini (M1, 2020):

• 3.2 Ghz 8-core M1, 8/16 GB 2133 MHz LPDDR4X-4266 SDRAM, 256/512 GB PCIe SSD, 7/8 Core GPU
  

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Mac mini (M2, 2023):

• 3.49 Ghz 8-core M2, 8/16/24 GB 3200 MHz LPDDR5X-6400 SDRAM, 256/512GB/1/2TB PCIe SSD, 10 Core GPU, 10G ethernet optional
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Mac mini (M2 Pro, 2023):

• 3.49 Ghz 10/12-core M2, 16/32 GB 3200 MHz LPDDR5X-6400 SDRAM, 512GB/1/2/4/8TB PCIe SSD, 16 Core GPU, 10G ethernet optional

M4 Apple Silicon Design

Mac mini (M4, 2024):

• 4.4 Ghz 10-core M4, 16/24/32 GB 3750 MHz LPDDR5X-7500 SDRAM, 512GB/1/2TB PCIe SSD, 10 Core GPU, 10G ethernet optional, 256GB SSD base
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Mac mini (M4 Pro, 2024):

• 4.4 Ghz 12-core M4, 24/32/64 GB 3750 MHz LPDDR5X-7500 SDRAM, 1/2/4/8TB PCIe SSD, 16/20 Core GPU, 10G ethernet optional, 512GB SSD base