Pakistan claimed more than 300 Afghan forces had been killed since fighting erupted on Thursday night during a broad Afghan cross-border attack into Pakistan.
Afghanistan rejected the figures as false. The casualty figures provided by either side could not be independently confirmed.
The fighting was in response to Pakistani air strikes in Afghanistan last Sunday.
Pakistan said it was targeting the outlawed Pakistani Taliban, or TTP.
The group is separate but closely allied with Afghanistan's ruling Taliban.
Afghanistan, however, said only civilians were killed in Sunday's air strike.
After the Afghan attack, Pakistani Defence Minister Khawaja Mohammad Asif declared Friday: "Our patience has now run out. Now it is open war between us."
Pakistani Information Minister Attaullah Tarar said on Saturday that more than 331 Afghan forces had been killed and over 500 others wounded during the ongoing military strikes in Afghanistan.
Pakistan destroyed 102 Afghan posts, captured 22 others and destroyed 163 tanks and armoured vehicles at 37 locations, he said.
The Afghan government's deputy spokesman, Hamdullah Fitrat, said the claim of hundreds of Afghan forces killed and wounded "is untrue and we reject it".
He accused Pakistan of targeting civilian areas in the provinces of Paktika, Khost, Kunar, Nangarhar and Kandahar, as well as refugee camps in Torkham and Kandahar.
Fitrat said 52 people had been killed, most of them women and children, and 66 others wounded.
Meanwhile, the United Nations wrote on X that major cities in Afghanistan were reportedly bombed by the Pakistani military on Friday, marking a new escalation and raising fears for civilians already struggling under the harsh rule of the Taliban authorities.
On Friday, Afghan government spokesman Zabiullah Mujahid said 13 Afghan forces were killed and 22 wounded.
He also said 55 Pakistani soldiers were killed. Pakistan put its own military figures at 12 killed, 27 wounded and one soldier missing in action.
Pakistan's state-run media reported the country's air force carried out strikes targeting key military installations in various areas of eastern Afghanistan.
According to Pakistani authorities, hundreds of residents living near the northwestern Torkham border crossing had fled.
In recent days, Pakistan has also deported dozens of Afghan refugees to Torkham.
Ejaz Ul Haq, an Afghan refugee stranded near the Torkham border with his family, said he could not return to Afghanistan because of the fighting.
Many others were struggling to obtain food during the fasting month of Ramadan, he said.
Afghanistan's Defence Ministry on Saturday said Afghanistan attacked Pakistani military bases in Miranshah and Spin Wam overnight, destroying military installations and causing heavy casualties in response to the ongoing airstrikes by Pakistan.
In eastern Afghanistan, the Department of Information and Culture accused Pakistan of targeting civilian areas, destroying homes and killing at least 11 people.
There was no immediate response from Pakistan, which has said it is targeting only military installations.
Mullah Taj Mohammad Naqshbandi, a commissioner on the Afghan side of the Torkham border, said in a statement on Saturday that the "brave forces of the Islamic Emirate destroyed the Pakistani military regime's commissariat, military units, and three important security towers."
On Friday, the Afghan government said 55 Pakistani soldiers were killed during its strikes and Afghan losses were far lower than Pakistan claimed.
Mujahid, the Afghan government spokesman, said Friday that the country's attacks on Pakistani military targets were meant as "a message that our hands can reach their throats and that we will respond to every evil act of Pakistan."
He added that "Pakistan has never sought to resolve problems through dialogue."
Pakistan has frequently accused Kabul of sheltering the TTP, allegations the group and Afghanistan's Taliban government deny.
