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TAXATION - Effective tax rates (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
Amount |  |  |  |
Income tax on statutory income tax rate | ¥ 1,169,276 |  |  |
Changes in valuation allowances | 185,516 |  |  |
Share-based compensation | 476,231 |  |  |
Preferential tax benefits | (65,016) |  |  |
Research and development super deduction | (143,723) |  |  |
Others | 214,057 |  |  |
Total income tax expense | ¥ 1,686,089 | $ 241,108 | ¥ 2,791,889 | ¥ 1,994,391
Tax Jurisdiction of Domicile [Extensible Enumeration] | CN | CN |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  |
Statutory income tax rate | 25.00% | 25.00% | 25.00% | 25.00%
Tax effect of preferential treatments |  |  | (3.00%) | (3.70%)
Tax effect of tax-exempt entities |  |  | 8.30% | 8.40%
Statutory tax rate difference |  |  | (0.40%) | 0.30%
Tax effect of permanent difference |  |  | (0.70%) | (4.10%)
Tax effect of R&D deduction and others |  |  | (2.30%) | (2.00%)
Change in valuation allowance | 4.00% | 4.00% | 13.70% | 1.40%
Share-based compensation | 10.20% | 10.20% |  |
Preferential tax benefits | (1.40%) | (1.40%) |  |
Research and development super deduction | (3.10%) | (3.10%) |  |
Others | 4.50% | 4.50% |  |
Effective tax rates | 36.00% | 36.00% | 40.60% | 25.30%
Cayman Island |  |  |  |
Amount |  |  |  |
Statutory tax rate difference | ¥ (192,363) |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  |
Statutory tax rate difference | (4.10%) | (4.10%) |  |
Hong Kong, China |  |  |  |
Amount |  |  |  |
Statutory tax rate difference | ¥ (2,278) |  |  |
Pillar II impact | ¥ 43,988 |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  |
Statutory tax rate difference | 0.00% | 0.00% |  |
Pillar II impact | 0.90% | 0.90% |  |
Other foreign jurisdictions |  |  |  |
Amount |  |  |  |
Statutory tax rate difference | ¥ 401 |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  |
Statutory tax rate difference | 0.00% | 0.00% |  |

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