Cheats in GTA 5 split into things the developers built and things they did not, and the difference matters.
Short answer
Anything built into the game is safe; anything needing an external program is not, and online use is a ban either way.
Codes entered correctly and rejected usually mean the wrong platform variant. Anything that requires downloading a program is not a cheat code. The developers have changed their mind about this at least once, which explains the older advice.
What gets you banned
If a site asks you to sign in to receive a code, it is not a code. Some effects cannot be undone within a save, and the game does not always warn you first. Most of the disagreement you will find online is two people describing different builds. A code that worked on an older patch may have been removed rather than changed.
Codes are usually case-insensitive but rarely space-insensitive. If you are coming to this after a long break, the terminology has probably moved on. Codes typically do not persist through a reload, which surprises people who use them for convenience.
What each one actually does
Anything that alters save state can corrupt it, which is why a separate save is worth the ten seconds. The short version is near the top on purpose; the reasoning is there if you want to know why. Case and spacing matter more than the lists suggest.
- Check the patch date on any code list.
- Ignore any list that asks you to install something first.
- Expect one number in every guide to be out of date; the method is what matters.
- Expect achievements to lock for that save file.
- Ignore any code that requires signing in somewhere.
Before you enable anything
Achievement locking is usually per-save rather than per-account, but not always. Patch notes move numbers around constantly; the shape of the answer holds even when a specific value shifts. Console entry uses button sequences with tight timing, and mistiming reads as a broken code. Console commands and cheat codes are different systems with different consequences.
The community wisdom on this is roughly half right, and the half that is wrong costs the most time. A cheat menu built into the game cannot get you banned, whatever the forum says. Controller-entered codes need rhythm rather than speed.
When a code will not take
There is no hidden trick here that the game is keeping from you. Enabling cheats disables achievements in most games, and the warning is easy to miss. Glitches get patched and codes tend not to, which makes codes the more durable option.
Time spent confirming which version you are on is never wasted. A code that softlocks a mission is a known risk in more than one of these games. Anything requiring an external program is a different category with different risks attached.
Achievements and save files
Where something depends on your platform or region, that is called out rather than glossed over. Single-player cheats are a supported feature; the same behaviour online is a ban. Some effects stack in ways the developers did not intend and the game does not handle gracefully.
Where people go wrong
- Treating a rare edge case as the normal behaviour and planning around it.
- Copying a setup wholesale from a streamer without understanding what each part does.
- Confusing a server-side outage with something broken locally.
- Changing five things at once and then not knowing which one helped.
GTA V FAQ
Do I need anything else set up first?
No. Where a step assumes something, it says so at that point rather than up front.
How long does this take?
Minutes if it goes cleanly, an evening if you hit the edge case in the caveats list. Neither is unusual.
Does this differ by region?
Occasionally. Where it does, it is usually storefront or server behaviour rather than the game itself.
Where should I check if this changes?
The in-game version of the information first, then the official patch notes. Community pages update after both.
Worth a second look after the next GTA 5 update, since roughly one thing here will have moved.