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LOSS PER CLASS A AND CLASS B ORDINARY SHARE - Schedule of basic loss per ordinary share (Details) - CNY (¥)
¥ / shares in Units, ¥ in Thousands, shares in Thousands
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Earnings per share [line items]    
Loss for the period ¥ (789,750) ¥ (791,517)
Weighted average number of Class A and Class B ordinary shares in issue 1,001,081 906,856
Basic loss per Class A and Class B ordinary share ¥ (0.79) ¥ (0.87)
Class A and Class B Ordinary share [Member]    
Earnings per share [line items]    
Weighted average number of Class A and Class B ordinary shares in issue 1,001,081 906,856
Basic loss per Class A and Class B ordinary share ¥ (0.79) ¥ (0.87)