The Koenigsegg CCX is a mid-engine sports car manufactured by Swedish automotive manufacturer Koenigsegg Automotive AB. The project began with the aim of making a global car, designed and engineered to comply with global safety and environment regulations, particularly to enter the United States car market. To sell cars in the US, many alterations were made to the design of the CCR; the previously used Ford Modular engine was replaced by an in-house developed Koenigsegg engine designed to run on 91 octane fuel, readily available in the United States, and to meet the Californian emission standards.

The name CCX is an abbreviation for Competition Coupé X, the X commemorating the 10th anniversary (X being the Roman numeral for ten) of the completion and test drive of the first CC prototype in 1996.

Specifically created and cast for Koenigsegg by Grainger & Worrall, a casting specialist with F1 experience in drivetrain components, the engine was built, assembled and tested at their Ängelholm production plant. It is an in-house developed 4.7L twin supercharged V8 engine capable of generating a maximum power output of 817 PS.

The chassis is made from carbon fibre reinforced with kevlar and aluminium honeycomb like the previous models.

At the 2008 Geneva Motor Show, Koenigsegg presented two special edition models, the CCX Edition and the CCXR Edition, both fitted with a remapped, 4.8 L twin-supercharged V8 engine and limited to 2 and 4 units respectively. The modifications to the engine increase the power of the CCX Edition to 900 PS 

The CCX was produced between 2006 and 2010 and the total production amounted to 49 cars (30 CCX, 9 CCXR, 6 CCX/CCXR Edition, 2 CCXR Special Edition and 2 CCXR Trevita). One of them was a CCX used for Crash tests and the other was a CCXR which is still a factory test car. Some CCX cars have later been upgraded to CCXR-specifications.

The Koenigsegg One:1 was presented at the 2014 Geneva Motor Show. Koenigsegg built six cars apart from the car presented at the Geneva Motor Show, all of which were already sold. Koenigsegg took two cars to the 2014 Goodwood Festival of Speed, where they were displayed alongside other sports cars such as the McLaren P1, LaFerrari, the Porsche 918 Spyder and the Pagani Huayra.

The car is fitted with a variant of the same 5.0 L twin-turbocharged V8 engine used in the other Agera variants. It generates a maximum power output of 1,360 PS  at 7,500 rpm and 1,371 N⋅m of torque at 6,000 rpm. The transmission is a 7-speed dual clutch paddle shift as used in other variants of the Agera.

The name One:1 comes from the power-to-weight ratio (1,360 PS to 1360 kg) giving the car 1 PS per 1 kg mass. The 1,360 PS power output is the equivalent of one megawatt, which Koenigsegg claims make the One:1 the 'world's first megacar'. The One 1 boasts 1 hp for every 1 kg, beating even the mighty Bugatti Veyron Super Sport which has a power to weight ratio of 1:1.5. The car is track-focused as opposed to the previous cars made by Koenigsegg, leading to changes such as limited boot space.

One of the most incredible facts about the Koenigsegg One 1 is its capability to run on different fuels – regular gasoline, high-octane race fuel, and the E85 biofuel. To achieve the 1:1 power-to-weight ratio, the Koenigsegg was running on the E85 Ethanol. Still, regular unleaded super isn’t badly off as the engine produces a maximum of 1160 hp.

The Koenigsegg Regera is a limited production, plug-in hybrid grand touring sports car manufactured by Swedish automotive manufacturer Koenigsegg. It was unveiled at the March 2015 Geneva Motor Show. The name Regera is a Swedish verb, meaning "to reign" or "to rule." Koenigsegg planned to produce only 80 units of the car, many of which were sold upon unveiling, though 84 Regera were actually constructed.

The Regera was developed and designed to be a more practical, luxurious, grand touring alternative to the rest of Koenigsegg's lightweight sports car lineup; initially the Agera and currently the Jesko. As a result, it is less focused on-track performance and spartan weight reduction and more focused on the smooth and instant delivery of power provided by its overhauled powertrain. Koenigsegg states that the Regera will be one of the most powerful and fastest-accelerating hybrid production cars produced.

The introduction of the Regera alongside the Agera RS in 2015 resulted in Koenigsegg, for the first time ever, simultaneously having two models in production. This role was passed from the Agera to the Jesko in 2019, which briefly shared the production line with the Regera when Jesko production began in late 2021.

The Regera is a two-door targa top with a detachable roof that can be stowed in the boot. It is the first hybrid car to be produced by Koenigsegg, as well as the first vehicle to use their Direct-Drive System for power delivery. As the company's 'grand touring' oriented offer in their two-car lineup, the Regera focuses more on interior luxury and daily usability instead of hardcore track performance like the Jesko.

The Regera has a reported total power output of 1797 hp through a hybrid powertrain. As in general, the Regera's internal combustion engine (ICE) generates its greatest power only at high rpm; however, due to the fixed gear, this corresponds to very high speeds. Power at low speeds is filled in by the electric motors, giving a maximum combined mechanical power output of 1500 hp. The Internal Combustion Engine (ICE) is a mid-rear mounted, in-house developed, twin-turbocharged V8 engine with a 5.0-litre displacement. It has four valves per cylinder.

The Regera has a claimed, electronically limited top speed of 404 km/h. Koenigsegg states it is capable of accelerating to 100 km/h from a stand still in 2.8 seconds, 200 km/h in 6.6 seconds, 300 km/h in 10.9 seconds, and attaining a speed of 400 km/h in 20 seconds. Koenigsegg also claims that the acceleration from 150–250 km/h  requires 3.9 seconds.

Koenigsegg planned to build 80 units of the Regera, making it the largest single-vehicle production run from the company until the introduction of the Jesko in 2019, of which the company plans to build 125 units. All build slots sold out on 13 June 2017 to customers and dealerships, just over two years after the initial unveiling of the car in Geneva.