This GTA 6 Diamond Casino Heist solo guide walks you through the fastest repeatable approach for maximizing your take without a crew. The Diamond Casino Heist is the most profitable repeatable heist in GTA 6. This guide covers the fastest known approach as of Patch 1.04.
Overview
Unlike previous games, GTA 6’s heist system allows fully solo completion with no crew cuts — meaning every dollar you earn stays in your pocket. You’ll need roughly $150,000 in setup costs and access to a Casino Executive Penthouse. The Diamond Approach — targeting the vault contents directly — consistently yields $2.2M to $2.4M per run.
Requirements
| Requirement | Cost | Notes |
|---|---|---|
| Casino Penthouse Access | $1,500,000 | One-time purchase, reusable forever |
| Hacking Device (prep) | Free | Takes ~8 min solo |
| Getaway Vehicles (prep) | Free | Park 2 cars at marked spots |
| Vault Keycards (prep) | Free | Steal from 2 security guards |
Prep Missions
Run the prep missions in order: steal the hacking device from Merryweather Labs, intercept the security convoy for keycards, optionally destroy the 12 Duggan weapons shipments to strip guard armor, then stage two getaway vehicles at the marked escape points.
Heist Execution
Start from the Penthouse map table and select the Diamond Approach. Land on the rooftop LZ, crawl past the two motion sensors, hit both vault keypads within 90 seconds of each other, then prioritize Loose Diamonds first (highest value per weight), then Gold Bars.
Escape
Once the vault opens you have roughly 3 minutes 45 seconds before a manual guard check. Take the service elevator, exit via the kitchen loading dock, and reach your pre-staged getaway vehicle without triggering the alarm for a 10% stealth bonus.
Payout Breakdown
| Source | Amount |
|---|---|
| Base vault contents | $2,100,000 |
| Hard difficulty bonus (+30%) | +$630,000 |
| Stealth completion bonus | +$200,000 |
| Prep missions costs | -$150,000 |
| Net payout (solo) | $2,780,000 |
Common Mistakes
Don’t take Art before Diamonds — it’s worth ~45% less per weight unit. Don’t enter the vault without both keycards simultaneously. And never use a personal-garage sports car for the getaway; trackers get you reported instantly.