Can you skydive in GTA 6?

Yes. Game Informer confirms base jumping, and its screenshots show Lucia free-falling above Vice City.

Are there parachute challenges in GTA 6?

Not confirmed. GTABase lists parachute jump challenges as in GTA V, but none has been shown yet.

Game Informer confirms base jumping, along with mini golf, billiards and the gym.

GTABase lists parachute jump challenges, as in GTA V. None has been shown in GTA 6 yet.

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01 / Activities
GTA 6 activities
29 GTA 6 activities confirmed: robberies, street races, gym, hunting, fishing, scuba, mini golf, pool, nightclubs. Plus 8 seen or probable.
02 / Activities
GTA 6 gym
The GTA 6 gym takes a membership and three exercises a day: weights raise health, the treadmill stamina. Work out three days in a row to level up.
03 / Activities
GTA 6 jet skiing
Jet skiing is a confirmed GTA 6 activity: Game Informer lists it, and the Extended Look shows two jet skis racing across Vice City waters at sunset.
04 / Activities
GTA 6 basketball
Basketball is in GTA 6: TGG saw Jason shooting hoops at his Leonida Keys safehouse, and a Vice City court appears in Rockstar's own screenshots.

Still unknown: Where the jump points are, and whether jumps are scored or paid.

Can you skydive in GTA 6?
Yes. Game Informer confirms base jumping, and its screenshots show Lucia free-falling above Vice City.
Are there parachute challenges in GTA 6?
Not confirmed. GTABase lists parachute jump challenges as in GTA V, but none has been shown yet.