GP4: 2026 F1 release: Alpine, Aston Martin and Cadillac

The 2026 F1 season is now under way, and so is work on bringing the 2026 grid to Grand Prix 4. 

I’m thrilled to be able to partner up with the RSCT team and divide up the work between us. I'm grateful for Excalibur and Isaint, veterans of the GP4 modding scene and the dedication they have to keep preparing and sharing up to date cars with you each season. Indeed, my contribution this year is indebted to partnering and discussing and sharing resources together with them. 

Even things like a shared light texture, wheel sizes and positions, and some geometry discussions have all helped to create a consistent, polished release.

And today, I’m excited to reveal not just one car, not two, but three cars from the 2026 grid! The regulations are so tight in some areas that some parts of the car can be reused for each car. However, each team has still explored unique aerodynamic philosophies, giving every car its own character.

Alpine A526

I have for you the Alpine A526. Having ditched their own engine programme, they are now Mercedes customers, and they did well to negotiate a deal with what appears to be the benchmark Power Unit on the 2026 grid so far. The styling and presentation of the team is very similar to 2025. 

Aston Martin AMR26

There is also the Aston Martin AMR26. Working on the British marque is always a highlight, though nailing the perfect green in-game is a challenge! This year’s AMR26 is striking, clearly bearing the signature of Adrian Newey’s design philosophy. While the Honda power unit isn’t quite up to scratch yet, at least you can enjoy a reliable car in GP4. Why not crank your force feedback to 400% for a more realistic experience. 

Cadillac MAC26

And then I've also worked on the Cadillac MAC26 - a nod to the founder of the project, Mario Andretti and his son, Michael. Sadly, it's another bad episode of a tumultous relationship between Michael and F1, but I am so glad to have the right number of teams on the grid to fit GP4! Its asymmetrical livery might not be to everyone’s taste, but it’s guaranteed to stand out on track.

Please note that the rims and helmets shown here are experimental for now. Excalibur is hard at work on a dedicated 2026 tyre and rim pack, which will bring everything together visually once the full set is ready.

I’ve also begun work on the 2026 helmet set, and you may already spot Sergio Pérez’s helmet in the Cadillac as an early preview of what’s to come.

Included in each pack are the car shapes and the textures as seen at the Australian GP. 
You’ll also find the internal cockpit view for each car, along with the collision mesh file.

Thank you all for your continued support of the GP4 modding community.

I hope you enjoy these new additions to the 2026 grid.

Happy racing! 

2026 Alpine, Aston Martin & Cadillac

by fongu

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I forgot to include the Tweaker positions in the read-me, so I'll post them here:

Alpine: 

[HELMET_POSITIONS] =  0.0000, 0.1790, -0.3340

[REAR_LIGHT_AMBIENT01_POS] =  0.0000, -0.2180, -2.9600

[REAR_LIGHT_AMBIENT02_POS] =  0.5589, 0.2747, -2.9233

[REAR_LIGHT_AMBIENT03_POS] = -0.5589, 0.2747, -2.9233

[EXTERNAL_STEER_POSITIONS] =  0.0000, 0.0160, -0.1140

[TYRE_POSITIONS_CAR19]
FrontRight      =   0.7400, -0.18000,  1.1847
FrontLeft       =  -0.7400, -0.18000,  1.1847
RearRight       =   0.7000, -0.18000, -2.2144
RearLeft        =  -0.7000, -0.18000, -2.2144

[ONBOARD_CAMERA_CAR19]
Cockpit         =  0.0000,  0.1581, -0.3100,    0.0000,  -1.700,  0.0000
TVCockpit = 0.0000, 0.6143, -0.8143, 0.2747, -10.9900, 0.0000

[CAMERA_VIEW_ANGLE_CAR19]

Cockpit         =   0.1500,   0.0000,   -0.3100,   0.0000

TVCockpit = 0.3200, 0.3200, -0.2000, -80.0000

Aston Martin: 

[HELMET_POSITIONS] =  0.0000, 0.1790, -0.3340

[REAR_LIGHT_AMBIENT01_POS] =  0.0000, -0.2180, -2.9600

[REAR_LIGHT_AMBIENT02_POS] =  0.5589, 0.2747, -2.9233

[REAR_LIGHT_AMBIENT03_POS] = -0.5589, 0.2747, -2.9233

[EXTERNAL_STEER_POSITIONS] =  0.0000, 0.0160, -0.1140

[TYRE_POSITIONS_CAR14]

FrontRight      =   0.7400, -0.18000,  1.1847
FrontLeft       =  -0.7400, -0.18000,  1.1847
RearRight       =   0.7000, -0.18000, -2.2144
RearLeft        =  -0.7000, -0.18000, -2.2144

[ONBOARD_CAMERA_CAR14]
Cockpit         =  0.0000,  0.1581, -0.3100,    0.0000,  -1.700,  0.0000
TVCockpit = 0.0000,  0.6476, -0.7429,    0.2747, -10.9900,  0.0000

[CAMERA_VIEW_ANGLE_CAR14]

Cockpit         =   0.1500,   0.0000,   -0.3100,   0.0000

TVCockpit = 0.3200,   0.3200,   -0.2000,   -80.0000

Cadillac: 

[HELMET_POSITIONS] =  0.0000, 0.1790, -0.2140

[REAR_LIGHT_AMBIENT01_POS] =  0.0000, -0.2080, -2.8500

[REAR_LIGHT_AMBIENT02_POS] =  0.5600, 0.2936, -2.8433

[REAR_LIGHT_AMBIENT03_POS] = -0.5600, 0.2936, -2.8433

[EXTERNAL_STEER_POSITIONS] =  0.0000, 0.0380, 0.0200

[TYRE_POSITIONS_CAR21]

FrontRight      =  0.75000, -0.18000,  1.30000
FrontLeft       = -0.75000, -0.18000,  1.30000
RearRight       =  0.73000, -0.18000, -2.10000
RearLeft        = -0.73000, -0.18000, -2.10000

[ONBOARD_CAMERA_CAR21]
Cockpit         =  0.0000,  0.1581, -0.3100,    0.0000,  -1.700,  0.0000
TVCockpit = 0.0000, 0.6524, -0.7990, 0.2700, -10.9900, 0.0000

[CAMERA_VIEW_ANGLE_CAR21]

Cockpit         =   0.1500,   0.0000,   -0.3100,   0.0000

TVCockpit = 0.2500,   0.2500,   -0.0500,   -10.0000