I answered a very similar question to this one here: https://clarity.fm/a/436

In short, teams or a founder with prior success can raise *substantial* seed funding with little to no product. But generally speaking, it is always best to have some version of your product and some evidence of product/market fit for that product before raising seed capital.

The cost of getting to that stage has decreased so substantially that seed investors expect teams to be able to achieve that as evidence that they are competent, committed and able to achieve the minimum requirements for business success.