At his base while fatigued, he shattered an arm from Guruguru's Buddha Statue
He easily killed a White Zetsu
He took less damage from Mabui's Heavenly Transfer than Tsunade
With his V1 cloak, he fought and briefly overpowered KCM1 Naruto, sending him flying with punches and Naruto praises his strength. He also threatened to kill Naruto.
He chopped off Gyuki's horn and made him wince
He's stated to be the strongest in Kumogakure by the time of the Fourth Shinobi World War meaning he's stronger than Bee & Gyuki and with his V2 cloak, he gains more speed and punching power.
Karin stated that V2 Ay's chakra was at Bijuu level
Bee stated that Ay was capable of killing KCM1 Naruto in his V2 cloak
He withstood a Lariat from Bee
With an enhancement from Onoki, he punched through Madara's Humanoid Susanoo, broke it's ribs and sent it flying
He blocked an attack from Madara's Susanoo
I'd say he's below Tsunade but if Onoki's enchancement counts, above Tsunade.