The 2026 Formula One season introduced sweeping regulatory changes affecting power units, aerodynamics, and car geometry. The turbocharged 1.6-litre V6 internal combustion engine was retained, but the MGU-H was eliminated while the MGU-K output was increased to 470 bhp (350 kW), reducing the internal combustion contribution to approximately 540 bhp (400 kW). Active aerodynamics — moveable front and rear wing elements — replaced the drag reduction system, with a new "overtake mode" deployable when a pursuing car is within one second of the car ahead. Cars were also downsized, with the wheelbase reduced from 360 cm to 340 cm and overall width from 200 cm to 190 cm.
Three new manufacturer entrants joined the grid. Cadillac debuted as the eleventh constructor using Ferrari power units, Audi entered as a full works team having acquired Sauber in 2024, and Honda relaunched an independent works programme in exclusive partnership with Aston Martin. Ford returned to the sport for the first time since 2004, collaborating with Red Bull Powertrains to supply Red Bull Racing and Racing Bulls. Alpine, no longer a Renault works team, switched to customer Mercedes power units.
Entering the later rounds of the season, Kimi Antonelli of Mercedes led the Drivers' Championship following an extraordinary run of form in the opening portion of the calendar. Antonelli won in China, Japan, Miami, and Canada — four consecutive victories — and became the youngest Formula One World Drivers' Championship leader, surpassing a record that dated to the era of Alberto Ascari, Italy's last championship leader in 1953. George Russell, Antonelli's Mercedes teammate, was competitive throughout but suffered a power unit failure in Canada that cost him victory. Lewis Hamilton secured Ferrari's first race win of the season at the Barcelona-Catalunya Grand Prix, ending a winless streak dating to the 2024 Belgian Grand Prix and producing the first all-British Formula One podium since the 1968 United States Grand Prix alongside Russell and Lando Norris.
McLaren, the reigning Constructors' Champions through their 2025 title with Norris as Drivers' Champion, found pace throughout the season. Norris took victory in the Miami sprint and contributed points consistently, while Oscar Piastri recovered from a pre-race incident at the Australian opener to rejoin the reckoning. Max Verstappen and Red Bull Racing endured a difficult opening stretch before Verstappen claimed the team's first podium of the season in Canada, finishing third behind Antonelli and Hamilton.
The São Paulo Grand Prix sits within a calendar that was restructured mid-announcement when the Bahrain and Saudi Arabian rounds were cancelled. The Spanish Grand Prix relocated from the Circuit de Barcelona-Catalunya in Montmeló — which continued hosting the Barcelona-Catalunya Grand Prix — to a new street circuit in Madrid centred on the IFEMA Exhibition Centre. The Emilia Romagna Grand Prix at Imola was discontinued after its contract, running through 2025, was not renewed. The Azerbaijan Grand Prix was rescheduled to a Saturday running to accommodate Azerbaijan's Remembrance Day.
Six events on the 2026 calendar featured the sprint format: the Chinese, Miami, Canadian, British, Dutch, and Singapore Grands Prix.
The 2026 season also introduced an increased cost cap for team operational expenditures, raised from $135 million to $215 million, primarily to reflect inflation adjustments and previously exempted cost categories. The power unit cost cap rose from $95 million to $130 million. Sporting regulation changes included mandatory lateral safety lights to display ERS status when cars stop on track, mandatory redesigned cooling vests when the FIA declares a heat hazard, revised front impact structure standards, and livery rules requiring that at least 55% of a car's surface area be painted or stickered to limit exposed carbon fibre.
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