GTA Online Diamond Casino Heist: Big Con, Cuts and Planning

The Diamond Casino Heist is a group job built around planning: entry, support crew, vault time and escape all affect the result. This guide focuses on preparing a Big Con route and the decisions to agree before the finale.

Reviewed 22 October 2026. We have removed the old mixed first-run/repeat payout table. Read your live planning board for the target, difficulty, host completion state and available approach.

Step 1: get set up

• Buy a Retro Arcade from Maze Bank Foreclosures. Pixel Pete in Paleto Bay does the job from around GTA$1.24 million; a city arcade just saves driving
• Head into the arcade basement: that is the planning board for the whole heist
• Start the heist from the board. You are working for Georgina Cheng, taking orders from Lester, and each attempt costs a GTA$25,000 setup fee
• Know the two ground rules going in: the finale needs two to four players, no solo, and your first-ever vault always holds cash

Step 2: scope the casino

• Walk in through the front of the casino as a guest and photograph every point of interest you can find inside: keypads, keycards on staff, cameras, guards
• Circle the building outside and log the access points: doors, gates, the security tunnel entrance
• Get a helicopter over the roof to photograph the rooftop access points, because the best escapes in this heist start or end up there
• Do not rush this. Every door you log now is an option when a run goes sideways later, and the plan always goes sideways eventually

Step 3: scope the vault before committing

Finish Vault Contents and read the target shown. Do not treat cancellation as a free, guaranteed reroll: availability depends on progression and another setup can cost time and money. For a learning run, working through the available plan is often more useful than repeatedly cancelling for a theoretical maximum.

Step 4: pick the approach

Three exist, and one of them is the cheat code. The Big Con with the Gruppe Sechs disguise walks you to the vault unchallenged, and it is the approach to teach every new crew. Silent and Sneaky is the full stealth fantasy for crews who already know the building. Aggressive is a shotgun through the front door, and every hit you take on it bleeds value out of the bag. This walkthrough runs Big Con; the other two reuse everything below except the entry.

Step 5: hire the crew

• Gunman: Karl Abolaji at 5%. On Big Con the guns barely matter
• Driver: Karim Denz at 5%. Confident crews barely touch the getaway cars
• Hacker, the one that matters: Avi Schwartzman, 10% for about 3 minutes 30 seconds of undetected vault time, unlocked by destroying all fifty signal jammers. No Avi? Paige Harris, 9% for about 3:25, unlocked by owning a Terrorbyte. The extra seconds repay the cut many times over on gold or diamonds

Step 6: run the preps

• Clear every required prep the board lists for Big Con: the Gruppe Sechs kit with its armoured Stockade van and uniforms, the vault keycards, and your exit disguise
• Going anywhere near loud, now or ever? Run Duggan Shipments: ten shipments around the map, destroy the lot, and the guards you might meet lose their heavy armour. Cheap insurance
• Prep in invite-only sessions so nobody griefs your evening away

Step 7: the finale, Gruppe Sechs, step by step

• Suit up in the Gruppe Sechs uniforms and drive the Stockade to the casino security tunnel
• Roll up to the checkpoint and let the guards wave you through. They are expecting a security van, and you are a security van
• Park in the tunnel and walk down to the vault level. Nobody challenges you on the way in
• At the double-swipe doors, both players swipe the keycards together
• Let the hacker open the vault door, and the clock starts the moment it does
• Loot in priority order: the target first, and if time remains, the side lockboxes. Know your grab order before the door opens, because looting animations eat the clock
• Leave when the hacker calls time, not after. Seconds outside the door are worth nothing
• Swap into your exit disguise at the swap point on the way up and walk out calmly. You have not been made until the game says you have
• The moment the disguise breaks or the exit spits you outside, sprint to the getaway cars, lose the cops through side streets, and drive to the buyer

Step 8: agree the buyer and check the next approach

• Check the selected buyer and escape plan together before launching.
• The approach just completed is not immediately available again. Read the board’s lock and difficulty indicators when planning the next run.
• Do not assume a second run automatically has the same target, difficulty or payout as the first.

Payouts: calculate the money you actually keep

Rockstar’s July 2026 economy notes include the Casino finale in host-based weekly completion rewards. Current first and repeat amounts can differ. Official patch notes. Old vault-value screenshots are not sufficient evidence of your next payout.

The cuts maths, worked

Start with the actual take that survives the mission, account for the displayed support-crew and organiser deductions, then apply the player split shown by the game. Subtract costs you personally paid. As an illustration, a GTA$2,000,000 player-split pool at 50% yields GTA$1,000,000 before your own costs. This is arithmetic, not a quoted Casino reward. Keep Elite and other awards separate.

Finding a crew

Arrange your group before beginning the finale and confirm compatible platform and game edition. Use the online desk to find the available Discord link if you need teammates. Availability depends on who is online; joining the community does not guarantee an immediate crew.

For your first clear, aim for a coordinated finish rather than the maximum possible vault value. Agree who handles each interaction, call the exit early enough to leave safely, then review where time was lost before attempting a harder run.

Plan your next step

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