Super-fan1230
I personally think All-star Superman is Star level because at the end of the comic , we see a superman moving Faster Than Light into the sun and his Solar energy spread out into the entire sun to repair it-
https://2.bp.blogspot.com/-DCoY6ReMlUE/VjnJHjnfLsI/AAAAAAAADas/kON90_QR_4A/s0-Ic42/019.jpg
For reference this is how Sun is as compared to Earth in size-
https://www.universetoday.com/wp-content/uploads/2010/05/sunearthcompared.jpg
or as told by Jimmy Olsen in the comic itself-
https://2.bp.blogspot.com/-NunXDsQJ19I/VjnB3RN8icI/AAAAAAAAC2s/AxkXHX4uQkk/s0-Ic42/006.jpg
We already know that he was atleast continental as he was able to survive a beating from 2 astronaut Kryptonians from earth to the moon and from moon to the earth at a Faster than light speed and the moon getting cracked into 2 pieces-
http://i.imgur.com/qe0wxIy.jpg
http://i.imgur.com/NfHZblX.jpg
Plus also he lifted 200 quintillion tons with one arm while no upper limit of his strength was found !-
http://i.imgur.com/DuKxwuj.jpg
and the moon weighs-
73.5 million metric tons !
https://weightofstuff.com/how-much-does-the-moon-weigh/
https://2.bp.blogspot.com/-DCoY6ReMlUE/VjnJHjnfLsI/AAAAAAAADas/kON90_QR_4A/s0-Ic42/019.jpg
For reference this is how Sun is as compared to Earth in size-
https://www.universetoday.com/wp-content/uploads/2010/05/sunearthcompared.jpg
or as told by Jimmy Olsen in the comic itself-
https://2.bp.blogspot.com/-NunXDsQJ19I/VjnB3RN8icI/AAAAAAAAC2s/AxkXHX4uQkk/s0-Ic42/006.jpg
We already know that he was atleast continental as he was able to survive a beating from 2 astronaut Kryptonians from earth to the moon and from moon to the earth at a Faster than light speed and the moon getting cracked into 2 pieces-
http://i.imgur.com/qe0wxIy.jpg
http://i.imgur.com/NfHZblX.jpg
Plus also he lifted 200 quintillion tons with one arm while no upper limit of his strength was found !-
http://i.imgur.com/DuKxwuj.jpg
and the moon weighs-
73.5 million metric tons !
https://weightofstuff.com/how-much-does-the-moon-weigh/