A very typical Dianthus caryophyllus.
Is it supposed to be a particular cultivar? If so, maybe 'Sunflor Sofia' or one of many similar ones?
It's often hard to find descriptions of these cultivars or to figure out what is supposed to be distinctive about them, and so it's often hard to "prove" it's any particular cultivar... and if it was grown from seed, then there's more uncertainty introduced. (At best, it can only be said to be "ex. [the cultivar name]".)