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SHORT-TERM INVESTMENTS - Held-to-maturity and available-for-sale debt investments (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥)
--- | --- | --- | ---
Held-to-maturity debt investments |  |  |
Cost or amortized cost less allowance for credit losses | ¥ 5,526,195 |  | ¥ 5,417,761
Available-for-sale debt investments |  |  |
Available-for-sale debt investments | 5,370,207 |  | ¥ 551,348
Short-term investment |  |  |
Held-to-maturity debt investments |  |  |
Cost or amortized cost less allowance for credit losses | 5,526,195 |  |
Gross unrecognized holding gains | 3,176 |  |
Gross unrealized holding losses | (75,405) |  |
Fair value | 5,453,966 | $ 779,907 |
Available-for-sale debt investments |  |  |
Cost or amortized cost less allowance for credit losses | 5,405,275 |  |
Gross unrecognized holding gains | 0 |  |
Gross unrecognized holding losses | (35,068) |  |
Available-for-sale debt investments | ¥ 5,370,207 | $ 767,929 |

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