[2] The production vehicle used mechanical components from the contemporary Opel Kadett B and two-door hard top bodywork by French contractor Brissonneau & Lotz.

[3] Opel marketed a second generation GT (2007–2009) as a rebadged variant of the Saturn Sky two-seater convertible (which was based on the Pontiac Solstice), manufactured in Wilmington, Delaware, USA.

In 2016, Opel introduced the GT Concept at the 2016 Geneva Motor Show as a lightweight, turbocharged, rear-wheel drive two-seater.

In 1971, due to emissions regulations, Opel reduced the compression ratio of the 1.9 L engine used in the US and output fell to 83 hp (SAE).

There was also a GT/J model, which was a less expensive version of the 1.9 L GT that lacked nearly all chrome parts and offered fewer standard features, sold only in Europe.

Designed by Opel stylist Erhard Schnell,[5] the GT is a fastback, that has neither an externally accessible trunk nor a conventional hatchback.

Reasons for ending production were the need to redesign the car to remain competitive with up-and-coming sports models, such as the Datsun 240Z, as well as the termination of Brissonneau and Lotz' bodybuilding contract.

[7] Automotive magazine Road & Track reviewed the GT in their June 1969 issue, recording 0–96 km/h in 10.8 seconds and a top speed of 182 km/h.

)[9] Following the General Motors bailout of 2008 and subsequent restructuring of the company, both Saturn and Pontiac were done away with, resulting in the ceasing of all Opel GT production from 2009 onward.

[14] However, the production Opel GT concept was cancelled not only due to a shrinking market for sports cars, but also the brand's acquisition by Groupe PSA.