The Yangwang U9 Xtreme is the fastest sports car in the world by a reported top-speed run of 496.22 km/h (308.4 mph), recorded at Germany’s ATP Papenburg test track in 2025. It is a limited-production electric hypercar, but the title depends on what counts as a production car and how a speed record is measured.
That distinction matters: the Bugatti Chiron Super Sport 300+ went faster than 300 mph in a one-way run, while the SSC Tuatara’s widely cited record comes from a two-way average. Here’s how the leading claims compare, what the numbers mean, and why a single top-speed figure rarely settles the debate.
Who is the fastest sports car in the world?
The Yangwang U9 Xtreme currently holds the highest reported top-speed figure among limited-production road-car models: 496.22 km/h, or about 308.4 mph. The run took place at ATP Papenburg, a high-speed test facility in Germany. Yangwang is BYD’s premium performance-car brand.
The U9 Xtreme is an electric hypercar based on the Yangwang U9, with a limited production run announced by the manufacturer. Its speed makes it the leading answer if “fastest” means the highest reported single-run speed by a production-intended car. It does not automatically settle every version of the record, however.
There is no single worldwide authority that applies one universal rule to every top-speed attempt. Some records require a car to run in both directions, then use the average to reduce the effect of wind or a slight slope. Others cite the fastest speed in one direction. Eligibility can also depend on whether the car is a customer model, a prototype, or a specially prepared version.
How the leading top-speed claims compare
The table separates the headline numbers from the conditions behind them. These cars are all hypercars—extremely high-performance, low-production vehicles—rather than ordinary sports cars. Their figures are not perfectly interchangeable because the runs used different rules and conditions.
| Car | Reported speed | How to read the figure | Best for |
|---|---|---|---|
| Yangwang U9 Xtreme | 496.22 km/h (308.4 mph) | Reported single-run peak at ATP Papenburg in 2025 | Highest reported production-model top speed |
| Bugatti Chiron Super Sport 300+ | 490.48 km/h (304.77 mph) | One-way run in 2019 using a pre-production development car | A landmark run above 300 mph |
| SSC Tuatara | 455.3 km/h (282.9 mph) | Reported two-way average from a 2021 attempt | A notable two-direction record claim |
| Koenigsegg Agera RS | 447.19 km/h (277.87 mph) | Two-way average recorded on a Nevada road in 2017 | A well-known two-way public-road record |
The fairest comparison is not always the biggest number. A two-way average is generally more demanding than a one-way peak because the car must make its speed in both directions. A record claim also needs clear rules about the car’s specification and the equipment used to measure speed.
Why the Bugatti Chiron Super Sport 300+ still matters
In 2019, a Bugatti Chiron derivative reached 490.48 km/h (304.77 mph) on Volkswagen Group’s Ehra-Lessien test track. That was the first widely publicized run above 300 mph by a car. It remains a major milestone, even though the run is not directly equivalent to a two-way production-car record.
The car used for the run was a pre-production development vehicle, not simply a standard customer car taken from a showroom. Bugatti later offered the Chiron Super Sport 300+ to customers in a limited series, with changes from the record-setting car. So the headline speed describes a specific run and configuration, not a speed every Chiron Super Sport 300+ owner can expect to reach.
This is a common point of confusion: a car reaching a speed once does not prove that every version of that model can repeat it. The test car, tires, setup, track, weather, and record rules all affect what the result means.
Why two-way records can tell a different story
A one-way attempt can benefit from a tailwind or a slight downhill grade. A two-way test helps account for those factors: the car runs in opposite directions, and the speeds are averaged under the relevant rules. The result may be lower than the fastest single pass, but it gives a more balanced measure of the car’s performance.
The SSC Tuatara drew attention after a disputed top-speed claim in 2020. In 2021, SSC reported a two-way average of 282.9 mph (455.3 km/h) from runs at Space Florida’s launch and landing facility. That is a different kind of claim from a one-direction peak, and it should be described as such.
The Koenigsegg Agera RS recorded a 277.87-mph (447.19-km/h) two-way average on a closed public road in Nevada in 2017. The record was achieved on a temporarily closed stretch with a professional driver and support. It was not a demonstration of safe or legal speed on an open road.
What makes a car fast enough to exceed 300 mph?
Top speed depends on more than engine power. At very high speeds, air resistance rises sharply, so a car needs substantial power just to push through the air. Its shape must also keep it stable without creating so much drag that it cannot accelerate further.
Power and gearing
A powerful engine or electric motor supplies the energy needed to overcome resistance. Gearing—the relationship between motor speed and wheel speed—must let the car continue accelerating at the top end. A short gear ratio can deliver strong acceleration but may limit maximum speed if the motor reaches its operating limit too soon.
Aerodynamics and stability
Designers balance low drag with control. Downforce is the force that presses a car toward the road and can help with grip, but creating too much of it can increase drag. At extreme speeds, the body, underfloor, and adjustable aerodynamic parts must work together to keep the car settled.
Tires and testing conditions
Tires face enormous heat and force at extreme speeds. Their condition, construction, pressure, and approved operating limits are critical to a test. A fast car cannot safely use its theoretical power unless the tires can handle the speed and the test site can support a controlled run.
Track length and weather matter, too. A long, level runway or test track gives the car room to accelerate and slow down. Wind, air temperature, surface condition, and elevation can all affect the result, which is one reason record organizations set specific procedures.
What “fastest sports car” can mean
People use “fastest” to describe several different measurements. These should not be treated as the same achievement:
- Highest top speed: the greatest speed reached during a run.
- Two-way average: the average of runs in opposite directions, where the record rules require it.
- Acceleration: how quickly a car reaches a speed, such as 60 mph or 100 mph.
- Track pace: how quickly a car completes a circuit, which depends on braking, cornering, tires, and driver skill as well as power.
A car with the highest top speed is not necessarily the quickest around a road course. Circuit performance rewards braking and cornering, while a top-speed attempt takes place on a suitable straight with specialized preparation. If you are comparing cars to buy, acceleration, handling, comfort, and service support may matter more than a record run.
How to judge a top-speed record claim
Before treating a headline figure as a definitive record, check what the number actually represents. A few details can change the comparison:
- Identify the exact car. Check whether it was a customer-ready production model, a limited-run edition, or a prototype.
- Check the test format. Find out whether the number is a one-way peak or a two-way average.
- Look for the location and conditions. A closed test facility and an open public road create different testing circumstances.
- Check who measured the speed. Independent timing or measurement and published test details make a claim easier to assess.
- Separate a claim from a verified record. Manufacturers may announce a result before an independent record body has confirmed it.
This checklist is useful because headlines often place different kinds of achievements side by side. Comparing the number alone can make a development car’s one-way run seem directly equal to a customer car’s two-way average, when the tests answered different questions.
Can you drive these cars at their record speed?
Not on public roads. Record attempts take place on closed facilities with professional crews, controlled conditions, and room to slow down. Public roads have traffic, surface hazards, and legal speed limits; a car’s capability does not make an extreme-speed run safe or lawful there.
Even owners of a road-legal hypercar should not assume that its advertised top speed is available in ordinary use. The figure may require special tires, a specific vehicle setup, and a long, controlled test surface. If you are shopping for a high-performance car, focus on the model’s approved configuration and use a supervised track event for performance driving.
The Yangwang U9 Xtreme is the leading answer to who is the fastest sports car in the world when the comparison uses its reported 496.22-km/h top-speed run. The Bugatti Chiron Super Sport 300+, SSC Tuatara, and Koenigsegg Agera RS remain important examples, but their figures come from different test formats and should not be ranked as if every run followed identical rules.
For a fair comparison, check the car’s exact version, whether its figure is a one-way peak or a two-way average, and how the run was measured. If you are comparing cars to buy, use top speed as one data point—not a substitute for checking safety, handling, and the driving conditions you will actually encounter.