GTP '2020–pr.

On 24 January 2020, ahead of the 2020 24 Hours of Daytona, a joint ACO and IMSA press conference was held at the Daytona International Speedway, where ACO and IMSA announced the new LMDh ruleset. It would supersede the Daytona Prototype International, and was converged with the Le Mans Hypercar regulations. It was planned to first be introduced in Europe starting from September 2021, before having its North American debut in 2022 at the 2022 Rolex 24 at Daytona.