It looks like the modder Josh Romito has just released his graphics REDUX overhaul mod for the PC version of GTA 5.
Currently, the website seems to be down/server issues IMO, but you can get more details here later on:
GTA V Redux from modder Josh Romito adds to nearly all visual aspects of the open-world sandbox, renovating everything from textures to weather system, volumetric lighting and post process effects.
To start with, the mod offers “100% re-written weather files from scratch, without a detail over-looked.”
Some of the other improvements include new motion blur and depth of field effects, new custom HBAO effects, re-configured atmospheric fog effects, newly added volumetric lighting, brand new weather particle effects, and massively improved terrain tessellation.
That’s not all; Redux also adds a ton of texture improvements including new 4K textures for plants, grass, fire, water, clouds and more.
To add a whole new level of photorealism to GTA V, the mod uses a series of “only the best” ReShade and ENB presets for “perfect color correction, bloom, tonemapping, and more.”
Users can choose from more than 15 ReShade modes including Redux Original, Redux Lite, The LUT, Deep & Rich, Dark & Realistic, and more.
GTA 5 REDUX - OFFICIAL LAUNCH TRAILER:
To be able to run this mod, Romito recommends at least 70GB additional free hard drive space, and a PC system “with optimal performance, and the ability to handle a 5-20 frames per second drop in comparison to the “vanilla” game”.
In short – you’ll need a powerful beefy rig to be able to run this mod. According to Romito, “the variance between 5 and 20, is due to the players choice of ReShade presets. All the different options come with a different style, as well as performance impact”.