It can produce 10nm chips.
The 28nm lithography machine can produce 10nm chips. In the era of no euv lithography machine, TSMC has been able to produce 7nm chips with 28nm lithography machines, so the production of 10nm is completely no problem. The principle is roughly to achieve a higher process by repeatedly etching the wafer with multiple exposures. Domestic companies such as SMIC can now also produce 10nm chips.