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Prepayments and other current assets
 12 Months Ended
Dec. 31, 2024
Prepaid Expense and Other Assets, Current [Abstract]  
Prepayments and other current assets Prepayments and other current assets
Prepayments and other current assets consisted of the following:
As of December 31,
20232024
RMBRMB
Prepayments to suppliers302,421 167,747 
Receivables from partial sale of equity interest in SiEngine (refer to Note 9)— 130,000 
Contract cost assets104,309 69,932 
Others36,770 84,606 
Prepayments and other current assets443,500 452,285 
No provision was made for prepayments and other current assets as of December 31, 2023 and 2024, respectively