GTA IV

GTA IV Fusion Fix 5.1 Is Here: The Tiny Upgrades That Make Liberty City Feel Brand New

Nearly two decades on, Liberty City still has fans, and the modding community keeps polishing it. The latest proof is Fusion Fix 5.1 for GTA IV: The Complete Edition on…

October 2, 2026
3 min read

Nearly two decades on, Liberty City still has fans, and the modding community keeps polishing it. The latest proof is Fusion Fix 5.1 for GTA IV: The Complete Edition on PC. It’s less about flashy visuals and more about the small annoyances you’ve probably grumbled about for years.

If you’re returning to Grand Theft Auto IV, here’s what’s new.

What’s New in GTA IV?

FeatureWhat It Does
Quick Save (phone)Save your game anywhere from Niko’s in-game phone
Auto Climb LaddersClimb automatically when you get close enough
Stunt Jump Camera toggleTurn off the cinematic camera and slow motion during stunt jumps
Independent sensitivity slidersSeparate aim and look-around controls for mouse and gamepad
Ragdoll toggle while jumpingGTA V-style option, per community coverage
PS3 gamma optionAnother visual preference choice, per community coverage
High-FPS fixesBetter animations, sprite drawing, scripted controls and missions

The Features Worth Your Attention

Quick Save is the star. Anyone who has lost progress to a sudden crash or a failed mission knows why this matters. Being able to save from your phone, anywhere, removes one of the game’s oldest frustrations.

GTA IV

Auto Climb Ladders is a small quality-of-life change that makes moving around feel smoother, especially during chases. It’s an option in the Controls menu, so you can leave it off if you prefer manual control.

The Stunt Jump Camera toggle will please completionists. Chasing all 50 stunt jumps is far less tedious when you can skip the slow-motion cutaway.

Better controls. New sliders let you tune mouse and gamepad aim and look-around sensitivity independently, which is a big help if you switch between both.

Fixes Under the Hood

Version 5.1 also refactors and improves several fixes for high frame rates, which has long been a pain point for modern PCs running an older game. A visual detail gets a patch too: preachers now properly hold a book in their hands again on PC.

Before You Update: Read This

The release notes warn that some menu settings may change after installing, because the settings code was refactored. If something looks off, adjust the options manually, or delete the GTAIV.EFLC.FusionFix.cfg file in your plugins folder and let it regenerate.

Quick checklist:

  • Back up your saves and current config.
  • Install the update.
  • Review your in-game menu options.
  • Test a short mission before a long session.

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FAQs

Q1. What is new in GTA IV Fusion Fix 5.1?

It adds Quick Save from the phone, Auto Climb Ladders, a Stunt Jump Camera toggle, separate sensitivity sliders and several high-FPS fixes.

Q2. Will updating reset my Fusion Fix settings?

Some settings may shift because the code was refactored. Re-adjust them in-game or delete the .cfg file in the plugins folder.


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