Any S Teir: Above the point of balance, considered a bannable god.
SS: Singlehanded carry regardless of comp
S+: Nearly uncounterable, and is a 90-100% ban rate. The god is strong at all stages of the game, and is difficult to beat.
S: Offers unrivaled pressure at their peak stage of the game. Easy to fit into almost any comp, and does their job safely and reliably.
S-: Extremely potent at their peak stage of the game. Easy to fit into almost any comp, and does their job safely and reliably.
Any A Teir: At the point of balance, considered a pickable god, or bannable in target ban situations.
A+: Strong at their peak stage of the game. Doesn't require a team to be built around them, but can be counterpicked to become less safe or reliable.
A: Average at their peak stage of the game. Can be counterpicked to become much less safe or reliable. Does better with a team picked to help them, but also doesn't completely require it.
A-: Slightly below average at their peak stage, but can still be relied on to do their job. They can be easily countered, or otherwise shut down by picks and bans.
B Teir: Below the point of balance, easily countered or unreliable.
B: Difficult to achieve their peak stage, or otherwise unsafe or unreliable. They may also have a weak stage that is so crippling to a team that the entire draft must consider this one god.
C Teir: Unpickable in most situations.
C: Counterable with ease, and with many other picks that do their peak jobs better, as well, or safer.
D Teir: So counterable or weak that any picks here may immediately lose the game.