"Higher
Should be used to denote a character's weapons, techniques, or attributes that are much stronger than their base level, but still within the same tier. For instance, a character that is Solar System level but has an attack that multiplies their power by 100 times, as in versus matches this can give said character an advantage in attack potency. In this instance it should be writt m as "Solar System level, higher with that ability or technique".
Furthermore, higher may also be used to denote a case where the character is possibly or likely a higher tier, but to what degree is not specified. This is specifically referring to cases such as "At least 4-B, likely higher" or "At least Solar System level, likely higher".