With GTA V in the hands  of many, here is a  GTA V cheats list which can be entered as button presses in the game.  These are the same for Xbox and PS3 versions and please be aware that enabling cheats will also disable gaining achievements/Trophies.

Key for PS3:

Y = Triangle

A = X

X = Square

B = Circle

Vehicles

• Spawn Buzzard B B LB B B B LB LT RB Y B Y <– (helicopter with missiles & guns)
• Spawn Comet RB B RT Right LB LT A A X RB
• Spawn Sanchez B A LB B B LB B RB RT LT LB LB
• Spawn Trashmaster B RB B RB Left Left RB LB B Right
• Spawn Limo RT Right LT Left Left RB LB B Right
• Spawn Stunt Plane B Right LB LT Left RB LB LB Left Left A Y
• Spawn Caddy B LB Left RB LT A RB LB B A
• Spawn Rapid GT RT LB B Right LB RB Right Left B RT
• Spawn Duster Right Left RB RB RB Left Y Y A B LB LB

Items

• Give Parachute Left Right LB LT RB RT RT Left Left Right LB

Player

• Raise Wanted Level RB RB B RT Left Right Left Right Left Right
• Lower Wanted Level RB RB B RT Right Left Right Left Right Left
• Explosive Melee Attacks Right Left A Y RB B B B LT
• Drunk Mode Y Right Right Left Right X B Left
• Fast Run Y Left Right Right LT LB X

World

• Change Weather RT A LB LB LT LT LT X Slidey Cars Y RB RB Left RB LB RT LB
• Slow Mo Y Left Right Right X RT RB

Lower wanted level

While playing the game, press RB(2), B, RT, Right, Left, Right, Left, Right, Left.

Raise wanted level

While playing the game, press RB(2), B, RT, Left, Right, Left, Right, Left, Right.

Recharge ability

While playing the game, press A(2), X, RB, LB, A, Right, Left, A.

Faster run

While playing the game, press Y, Left, Right(2), LT, LB, X.

Explosive ammo rounds

While playing the game, press Right, X, A, Left, RB, RT, Left, Right(2), LB(3).

Explosive melee attacks

While playing the game, press Right, Left, A, Y, RB, B(3), LT.

Slow motion aim

While playing the game, press X, LT, RB, Y, Left, X, LT, Right, A. The code can be entered up to four times to increase its effect. Enter it a fifth time to disable the code.

Slidey cars

While playing the game, press Y, RB(2), Left, RB, LB, RT, LB.

Spawn Buzzard

While playing the game, press B(2), LB, B(3), LB, LT, RB, Y, B, Y. The Buzzard is a helicopter with missiles and guns. It must be spawned in a large enough area for it to appear, or it will not spawn.

Spawn Caddy

While playing the game, press B, LB, Left, RB, LT, A, RB, LB, B, A.

Spawn Comet

While playing the game, press RB, B, RT, Right, LB, LT, A(2), X, RB.

Spawn Duster

While playing the game, press Right, Left, RB(3), Left, Y(2), A, B, LB(2).

Spawn Limo

While playing the game, press RT, Right, LT, Left(2), RB, LB, B, Right.

Spawn parachute

While playing the game, press Left, Right, LB, LT, RB, RT(2), Left(2), Right, LB.

Spawn Rapid GT

While playing the game, press RT, LB, B, Right, LB, RB, Right, Left, B, RT.

Spawn Sanchez

While playing the game, press B, A, LB, B(2), LB, B, RB, RT, LT, LB(2).

Spawn Stunt Plane

While playing the game, press B, Right, LB, LT, Left, RB, LB(2), Left(2), A, Y.

Spawn Trashmaster

While playing the game, press B, RB, B, RB, Left(2), RB, LB, B, Right.

Drunk mode

While playing the game, press Y, Right(2), Left, Right, X, B, Left.

Slow motion mode

While playing the game, press Y, Left, Right(2), X, RT, RB. The code can be entered up to four times to increase its effect. Enter it a fifth time to disable the code.

Change weather

While playing the game, press RT, A, LB(2), LT(3), X. Each time the code is entered, it rotates through thunder, clear, and snowy weather.

• PratfallingTo fall on your butt, press X to jump, and while you are in mid-air, press B