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IMSA GTP cars are purpose-built racing prototypes; GTD PRO cars are production-based cars homologated to FIA Group GT3 rules. That is the essential difference: GTP is a prototype class, while GTD PRO is a professional class for GT3 machinery. GTD PRO and GTD use the same GT3 technical car basis, so the “PRO” label does not mean GTD PRO has a separate type of car.
What is the difference between GTP and GTD PRO?
The classes describe different kinds of race cars. IMSA’s regulations place GTP in the Prototype grouping, separate from the GT classes. IMSA describes prototypes as designed specifically for the racetrack, while its Grand Touring cars are based on road-going production models.
GTD PRO is a Grand Touring Daytona class for cars homologated to FIA Group GT3 specifications. IMSA’s 2026 technical regulations apply that GT3 homologation basis to both GTD PRO and GTD.
| Class | Car concept | Technical basis |
|---|---|---|
| GTP | Purpose-built racing prototype | IMSA Prototype class; detailed 2026 technical parameters are not summarized here. |
| GTD PRO | Production-based Grand Touring car | FIA Group GT3-homologated car |
Sources: IMSA 2026 Sporting Regulations; IMSA 2026 GTD and GTD PRO Technical Regulations; IMSA’s BMW explainer.
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How do GTD PRO and GTD differ?
They do not differ in their underlying GT3 car specification: IMSA says both classes have used cars homologated to FIA GT3 standards since GTD PRO was formed in 2022, and its technical regulations cover GTD and GTD PRO together. The class names distinguish the competition categories, not two separate GT car platforms. The detailed sporting provisions for driver eligibility or class treatment are not established by the technical-car rules cited here, so “PRO” should not be used by itself to infer those specifics.
IMSA discusses the two as production-based classes in its August 2026 report, “GT Cars Are the Stars at VIR.”
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What cars run in each class?
GTP examples for the 2026 season
IMSA’s October 9, 2025 full-season announcement listed Porsche 963 entries for Porsche Penske Motorsport and BMW M Hybrid V8 entries for BMW M Team WRT in GTP. These are examples from the 2026 entry list, not an exhaustive list of every car that may appear at every event.
GTD PRO examples at the 2026 Rolex 24
In its January 20, 2026 Rolex 24 preview, IMSA identified Paul Miller Racing’s BMW M4 GT3 EVO and the Chevrolet Corvette Z06 GT3.R among the GTD PRO field. These are GT3-based Grand Touring cars, unlike the purpose-built GTP prototypes.
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Sources: IMSA’s 2026 season entry announcement; IMSA’s 2026 Rolex 24 GTD PRO and GTD preview.
How many cars are in the classes?
Entry numbers depend on whether the count covers the full season or a particular race. IMSA’s October 2025 announcement reported these 2026 full-season entries; its January 2026 Rolex 24 preview gave the larger event-field counts below.
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| Count and scope | GTP | GTD PRO | GTD |
|---|---|---|---|
| 2026 full-season entries, announced by IMSA October 9, 2025 | 11 | 8 | 14 |
| 2026 Rolex 24 event preview, published January 20, 2026 | not stated in that GTD PRO and GTD preview | 15 | 21 |
These figures describe the announced full-season field and the Rolex 24 preview respectively; they are not permanent class limits. Source: IMSA 2026 full-season entry announcement and IMSA Rolex 24 preview.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Do GTP cars have more power or go faster than GTD PRO cars?
The class definitions and sources cited here establish the car concepts and GT3 homologation basis, not a reliable numerical comparison of horsepower, speed, lap times, or cost. Those figures should not be inferred from the class names. IMSA also issues event-specific technical bulletins, including Balance of Performance or power-correction updates during the season; settings for one round are not fixed properties of either class. See IMSA’s 2026 Technical Bulletins index.
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