Gasly arrived at GP2 after winning the 2013 Formula Renault Eurocup with Tech 1 Racing and spending 2014 in the Formula Renault 3.5 Series, where he finished runner-up to fellow Red Bull junior Carlos Sainz Jr. He had been a member of the Red Bull Junior Team since late 2013, operating under the direct scrutiny of Red Bull motorsport advisor Helmut Marko, who set winning the GP2 championship as the prerequisite for an F1 promotion.
Gasly made a brief GP2 appearance in 2014 at Monza, substituting for a Caterham Racing driver, before joining DAMS for a full campaign in 2015 alongside Alex Lynn. Despite claiming three pole positions and four podiums, the season was disrupted by on-track incidents — including collisions at Bahrain, Spa, and Yas Marina, the last of which led to the cancellation of a race — and he finished eighth in the standings, two places behind teammate Lynn. The year demonstrated Gasly's raw pace but also highlighted the consistency required to compete at the front of the field.
For 2016, Gasly switched to Prema Powerteam, which had become the benchmark squad in the category. His teammate was Antonio Giovinazzi, the 2015 European Formula 3 runner-up and a GP2 rookie, who would prove to be his closest title rival. Red Bull had reduced its financial contribution to Gasly's programme to $500,000 — roughly half the total cost of a competitive GP2 seat — and Marko made clear that winning the title was the condition for remaining in the junior programme and earning an F1 drive.
Gasly delivered. Throughout the season he and Giovinazzi engaged in a close title battle, with Prema's machinery giving both drivers strong machinery across diverse circuits. Gasly accumulated victories and podiums consistently enough to edge out Giovinazzi and claim the GP2 Series championship. The title made him GP2 champion in his second full season and earned him his Formula One debut with Toro Rosso, which came at the 2017 Malaysian Grand Prix.
Gasly's GP2 title was notable for the pressure under which it was won. Operating within Red Bull's demanding junior system — where failure to meet targets meant losing factory backing entirely — he converted a financially constrained campaign into a championship. The 2016 GP2 grid was competitive, with Giovinazzi, Norman Nato, and others pushing hard throughout, making the title a genuine contest rather than a procession. Gasly's ability to manage pressure from above while winning on track became a hallmark that would define later chapters of his Formula One career as well.
Winning the GP2 title placed Gasly among a selective group of drivers who secured F1 seats directly through the Red Bull pathway on the strength of a feeder-series championship. His GP2 career is also remembered for the contrast between the difficult 2015 debut — marked by incidents — and the controlled, title-winning 2016 campaign, underlining the growth he showed across two seasons in the category.