The 2015 Koenigsegg One:1 is one of the most talked-about hypercars in Forza Horizon 6. It is rare, brutally fast, and one of the priciest cars you can buy. But is it actually worth the hefty price tag compared to other top-tier Koenigseggs in the game?
This guide covers everything you need to know — the full stats, engine details, what it drives like, and where it sits in the S2 class pecking order.
TL;DR — Koenigsegg One:1 Quick Facts
- Class: S2 — PI 890
- Price: 3,750,000 CR
- Drivetrain: RWD
- Rarity: Legendary
- Top Speed: 268 mph (431 km/h)
- 0–60 mph: 2.7 seconds
- Engine: 5.0L Twin-Turbo V8, 1,341 hp
- Best for: High-speed runs, expressways, highway races
- Watch out for: Heavy wheelspin in low gears, demanding throttle control
What Is the Koenigsegg One:1?
The real-world 2015 Koenigsegg One:1 is one of the most extreme hypercars ever built. Its name comes from its power-to-weight ratio — one metric horsepower for every kilogram of body weight. That made it the world’s first “megacar.” Only seven units were made, each priced at over $2.4 million USD.
In Forza Horizon 6, the One:1 is one of the most expensive cars in the entire game at 3,750,000 CR. It sits in the S2 class at PI 890 with rear-wheel drive and carries Legendary rarity. If you are building a prestige garage or chasing top-end S2 performance, the One:1 is a name you will come across early.
It is part of a strong lineup of Koenigsegg models in FH6. If you want to compare it against the full Koenigsegg roster, our Koenigsegg Gemera performance stats guide is a good companion read.
2015 Koenigsegg One:1 — Full Performance Stats in Forza Horizon 6
Here is a full breakdown of the One:1’s stock performance stats in Forza Horizon 6:
- Performance Index (PI): S2 — 890
- Drivetrain: Rear-Wheel Drive (RWD)
- Rarity: Legendary
- Price: 3,750,000 CR
- Top Speed: 268 mph (431 km/h)
- 0–60 mph: 2.7 seconds
- 0–100 mph: 4.5 seconds
- 0–250 mph: ~20 seconds
- Speed Rating: 10 / 10
- Handling: High — aided by active downforce
- Braking: Highly responsive
- Acceleration: Strong, but wheelspin-prone in lower gears
- Off-Road: Low — this is a pure tarmac machine
The Speed rating of 10 puts the One:1 among the absolute fastest cars in the game. That said, its PI of 890 sits a step below the very top of the S2 class. Cars like the Koenigsegg Gemera and Koenigsegg CCGT both sit at S2 900, meaning they technically outrank the One:1 on raw PI. However, the One:1’s 268 mph top speed and active aerodynamics give it real bite on open stretches of road.
Engine and Technical Specs
The One:1 runs a 5.0-litre (5,032cc) twin-turbocharged V8 engine. In-game, this translates to the following:
- Engine: 5.0L Twin-Turbo V8
- Power: 1,341 hp (1,000 kW) at 7,500 rpm
- Torque: 1,311 ft·lb (1,777 Nm) at 6,000 rpm
- Redline: 8,250 rpm
- Drivetrain: Rear-Wheel Drive
- Aerodynamics: Active downforce system — generates significant grip at high speed
The power figure of 1,341 hp is enormous, and the torque delivery is equally savage. This is why the One:1 generates heavy wheelspin up to fourth gear when traction control is disabled. The car rewards drivers who manage throttle input carefully — especially out of slow corners and in the early gears. If you are not used to RWD hypercars at this power level, expect some initial adjustment time.
How Does the Koenigsegg One:1 Drive in FH6?
On a long straight or an open expressway, the One:1 is a monster. It reaches 268 mph in stock form and gets there extremely quickly. The active aerodynamics provide meaningful downforce at high speed, which means it stays planted and stable in a way that some pure-drag builds do not.
Through corners, the One:1 is surprisingly capable for a 1,341 hp rear-wheel drive car. The downforce system does real work here. It is not as forgiving as an all-wheel drive hypercar, but it rewards clean inputs and smooth throttle management with genuinely competitive cornering speeds.
The main weakness is wheelspin. Off low-speed corners, especially with traction control turned off, the rear tyres lose grip aggressively up to fourth gear. This is the car’s biggest limitation for circuit racing and touge battles. On fast, wide-open roads and expressways, however, the One:1 is in its element. If you enjoy blasting Japan’s highways and expressways at full chat, our best roads guide has all the fastest routes mapped out for exactly that.
Koenigsegg One:1 vs Other S2 Koenigseggs
There are several Koenigsegg models in Forza Horizon 6’s S2 class. Here is how the One:1 compares to the most relevant ones:
- Koenigsegg Gemera (S2 900) — Higher PI, AWD, better all-round competitor. The Gemera is the stronger racing choice if you want top PI performance.
- Koenigsegg Jesko — Often ranked as the best all-round Koenigsegg in FH6. Stronger handling stats and a more controlled power delivery than the One:1, though slightly cheaper.
- Koenigsegg Agera RS (S2 890) — Same PI as the One:1, similar drivetrain. The Agera RS costs significantly less at around 2,900,000 CR, making it the better value choice if pure performance is your priority.
- Koenigsegg One:1 (S2 890) — The most expensive Koenigsegg in the game. Matches the Agera RS on PI but carries Legendary prestige and a slightly higher top speed in the Horizon series.
The honest verdict is this: if you already own the Agera RS, the One:1 is more of a collector’s car than a performance upgrade. The driving behaviour is similar, the class is identical, and the price is significantly higher. For players building a complete Legendary garage or chasing every high-end hypercar badge, it absolutely belongs in the collection. For players purely optimising race performance, the Jesko or Gemera are stronger choices.
Is the Koenigsegg One:1 Worth Buying?
At 3,750,000 CR, the One:1 is the most expensive Koenigsegg in Forza Horizon 6. Whether it is worth buying depends on what you want from it.
Buy the One:1 if:
- You are building a complete hypercar or Koenigsegg collection.
- You love high-speed expressway runs and want a Legendary-tier machine for them.
- You want one of the most iconic and exclusive hypercars ever made represented in your garage.
- You enjoy cars that demand skill — throttle control and traction management separate good drivers from great ones in this car.
Consider alternatives if:
- You want the strongest competitive S2 option at this price range. The Jesko or Gemera are better investments for racing.
- You already have the Agera RS. The overlap in PI and driving feel means the One:1 adds prestige more than performance.
- You are still building your early garage. Our best starter cars guide covers far more cost-effective choices for new players.
If credits are tight, our guide on how to earn credits fast will help you stack up the 3.75 million CR needed without grinding endlessly.
Best Events for the Koenigsegg One:1
Given its strengths and weaknesses, here are the event types where the One:1 performs best in Forza Horizon 6:
- Expressway and highway races — Long straights where 268 mph top speed and sustained high-speed stability matter most. Check our best roads and expressways guide for the ideal routes.
- Speed traps and speed zones — The One:1 has the raw velocity to dominate these challenges.
- Goliath and Colossus circuit races — Long-distance events with enough straights for the top speed to shine. See our Goliath Race guide for tips on running these events well.
- S2 class road races — The One:1 holds its own here, particularly on circuits with long flowing sections rather than tight technical corners.
Avoid using the One:1 stock in tight touge or mountain pass events without a proper tune. The wheelspin issue will cost you time on switchbacks and slow corners. For those events, check our list of best cars for touge battles instead.
Upgrade Tips for the Koenigsegg One:1
The One:1 responds well to tuning, but there are a few priority areas:
- Tyres — Fitting race compound tyres reduces wheelspin and improves traction out of slow corners. This is the single most impactful upgrade for day-to-day driving.
- Differential and suspension — Fine-tuning the differential settings to allow some slip while keeping rear stability under power makes a big difference. Stiffening the suspension slightly for high-speed events helps the car stay planted.
- Gearing — Lengthening the gear ratios slightly can help reduce wheelspin in the lower gears and extend the top speed ceiling even further.
- Anti-roll bars — Adjusting these can help reduce oversteer on corner exit, which is where the One:1 most often catches drivers out.
For a broader look at the best upgrade approaches across all classes, check our best cars upgrade and bodykit presets guide.
How to Get the Koenigsegg One:1 in Forza Horizon 6
The One:1 is available to purchase directly from the Autoshow in Forza Horizon 6. As a Legendary-rated car, it may also appear through the Auction House at varying prices depending on supply and demand at the time.
At 3,750,000 CR, it is one of the most expensive purchases in the Autoshow, so plan accordingly. If you are working toward a full Legendary garage, also check our all cars by class complete list to see the full picture of what is available at S2.
Koenigsegg One:1 and the Forza Horizon Series
The One:1 has been a staple of the Forza franchise for years. It first appeared in Forza Motorsport 6 as part of the Mobil 1 Car Pack and has featured in every main series entry since. Its reputation as one of the series’ most desirable hypercars is well-established.
In Forza Horizon 6, it continues that legacy. The 268 mph top speed, the distinctive active aero bodywork, and the 1:1 power-to-weight concept that inspired its name all make it one of the most memorable cars in the game. Even if it is not always the fastest car on the leaderboard at S2, it remains one of the most satisfying to drive at full speed through Japan’s open highways.
While you are exploring the hypercar end of the garage, also worth checking out are the 2020 Lamborghini Essenza SCV12, the 2019 Zenvo TSR-S, and the Ferrari FXX-K Evo — all serious S2-class competitors.
More Forza Horizon 6 Guides
- Best Cars for Every Class in FH6
- Best Drift Cars and Tuning Setup Guide
- Seasonal Events and Festival Playlist Guide
- Reward Pass Guide
- How to Find Sky Lanterns in Forza Horizon 6
- Beginner’s Guide — Tourist to Legend Progression
Where to Play Forza Horizon 6
Forza Horizon 6 is available now on PC, Xbox, and PlayStation. Pick it up from the official sources below:
Ending Note
The 2015 Koenigsegg One:1 in Forza Horizon 6 is a true prestige purchase. At S2 890, 268 mph top speed, and 1,341 hp on tap, it is a legitimate weapon on open roads and expressways. The wheelspin tendency in the low gears keeps it honest — this is not a car you can just point and shoot without some throttle discipline.
At 3,750,000 CR it is the most expensive Koenigsegg in the game, and purely on race performance, the Jesko and Gemera offer more well-rounded results at their respective price points. But for collectors, hypercar enthusiasts, and anyone who wants to blast Japan’s finest highways in one of the most exclusive cars ever built, the One:1 delivers in full.
