This is a list detailing what abilities Sasuke has as of the current chapter. (Note: this list isn't perfect and may be edited should I get a few details wrong, if I missed anything, or haven't explained it well enough. Feel free to correct/question me should you find anything wrong here.)

For the short of it, Sasuke has;

All the skills, jutsu, and experience of OG Sasuke Uchiha at the time of his battle against Orochimaru. (Chapter 1)

His canon Eternal Mangekyou Sharingan and Rinne-Sharingan abilities. (Chapter 1)

The ability to Planeswalk, can travel outside of the Naruto universe. (Chapter 1)

The Six Paths Chakra that Hagoromo would've given canon Sasuke and Naruto during the War. (Chapter 1)

A Sage Mode that is a combination of Kabuto's Sage Mode and Jugo's Sage Transformation. (Chapter 5)

Six Paths Sage Mode, the previously mentioned Sage Mode but greatly enhanced with Six Paths Chakra. Can use all abilities that come with it. (Chapter 5)

In more detail

Eternal Mangekyou Sharingan with a Rinne-Sharingan. EMS abilities are Amaterasu and Kagutsuchi. R-S ability is Amenotejikara. Can use all abilities that come with the Sharingan and Rinnegan. Can cast/break Infinite Tsukuyomi.

Blaze Release: Via use of Kagutsuchi to control and shape Amaterasu. This can be used for both offense and defense. Offensively: can be used over another ninjutsu or a weapon to increase its effectiveness, can form weapons made out of Amaterasu. Defensively; can form barriers that shield the caster and burn those who try to touch it (it's fire what do you expect?)

Sage Mode:

Modified Snake Sage Mode: Attained by surviving a bite from the White Snake Sage, which would normally grant one access to Snake Sage Mode. However, through knowledge of Senjutsu and Fuinjutsu, Hakuja Seninn granted Sasuke a combination of Snake Sage Mode and the Sage Transformation of the Tenbin Clan.

Snake Sage Mode: This grants Sasuke the use of Senjutsu and due to being a Snake Sage, he was able to learn Sage Art: Inorganic Reanimation (which lets him use natural energy to breathe life into inorganic substances and control them),

Sage Transformation: Able to gather Natural Chakra without needing to stay still, to use the body shifting abilities to form weapons or limbs (Hand wings and snake tail), can consume other humans to heal himself and replenish his chakra or do the reverse for the opposite effect to heal others.

Six Paths:

Six Paths Chakra: The chakra of Hagoromo Otsutsuki, the Sage of the Six Paths that has been given to Sasuke. Drastically improves the power of those who are bestowed it.

Six Paths Sage Mode: Formed from combining the use of Six Paths Chakra and Sage Mode. Six Paths Chakra further enhances Sasuke's Sage Mode. Massive enhancement of all abilities, senses, and durability, grants use of Truth-Seeking Orbs, grants use of Creation of All Things (yet to be used), Six Paths Senjutsu, can use all five basic nature transformations and make perfect use of Yin–Yang Release (yet to be used), immunity to all ninjutsu except for those enhanced with Senjutsu, can fly.