As of September 2026, CarSearch.Pro's True Value model estimates a typical Porsche 718 Boxster/Cayman GT4 is actually worth $86,700 (fair range $76,300 to $97,100). Unlike the median asking price shown above, True Value is anchored to 177 recent confirmed sales, normalized for mileage, and blends auction hammer prices (grossed up for buyer's premium) with real-world asking behavior.
As of September 2026, the Porsche 718 Boxster/Cayman GT4 market has 1,000 active listings across 14 marketplaces tracked by CarSearch.Pro. The median asking price is $70,990, with the middle 50% of listings priced between $52,790 and $88,970. GT4 prices have decreased 13.4% over the past quarter, from a median sale price of $96,995 to $83,990.
The typical GT4 on the market has 21,254 miles. Listings spend an average of 63 days on market before selling or being removed.
Current GT4 Pricing
A fair price for a Porsche 718 Boxster/Cayman GT4 in September 2026 is between $52,790 and $88,970 (25th to 75th percentile). Prices range from $45,490 to $102,411 across 1,000 active listings.
Price Distribution (1,000 Active Listings)
Percentile
Price
Meaning
10th
$45,490
Budget / project cars
25th
$52,790
Below average price
Median (50th)
$70,990
Typical market price
75th
$88,970
Above average / premium
90th
$102,411
Top tier / low miles / rare spec
The average asking price is $71,873, which is higher than the median, indicating that high-priced outliers (rare specifications, very low mileage, or concours-quality examples) pull the average up.
Price by Mileage
Mileage Range
Listings
Median Price
Under 10,000 mi
282
$92,392
10,000 - 25,000 mi
250
$78,543
25,000 - 50,000 mi
274
$56,999
50,000 - 100,000 mi
166
$45,900
100,000 - 150,000 mi
11
$39,995
GT4 Price Trends
Porsche 718 Boxster/Cayman GT4 prices have decreased 13.4% over the past quarter. In 2026-Q3, the median sale price was $83,990 across 309 sales, down from $96,995 in 2026-Q2.
GT4 Quarterly Sale Prices (Historical)
Quarter
Sales
Median Price
Average Price
2026-Q1
176
$81,998
$96,173
2026-Q2
515
$96,995
$112,921
2026-Q3
309
$83,990
$103,203
Best Value GT4 by Model Year
The 2017 GT4 offers the best value with a median price of $48,984 across 140 listings. The most expensive model year is 2025 at a median of $94,966.
Median Price by Model Year
Year
Listings
Median Price
Min
Max
2016
1
$62,990
$62,990
$62,990
2017
140
$48,984
$34,980
$77,265
2018
194
$53,995
$22,800
$89,931
2019
145
$56,299
$5,000
$88,991
2020
17
$57,291
$46,998
$72,900
2021
68
$77,919
$18,000
$116,025
2022
83
$76,800
$49,990
$117,898
2023
55
$79,966
$46,000
$117,765
2024
157
$87,468
$21,000
$117,867
2025
139
$94,966
$30,000
$114,995
How Mileage Affects GT4 Value
Most price guides assume value falls linearly with mileage. It doesn't. CarSearch.Pro learns the actual price-vs-mileage curve for the Porsche 718 Boxster/Cayman GT4 from confirmed sales, referenced to a typical example at about 8,000 miles:
Odometer (approx.)
Value Multiplier
Implied Value
622 mi
1.35x
$117,479
4,657 mi
1.05x
$91,152
10,659 mi
1.00x
$86,735
19,879 mi
0.68x
$58,830
38,508 mi
0.58x
$50,101
61,531 mi
0.53x
$46,034
88,402 mi
0.58x
$50,330
154,919 mi
0.65x
$56,524
300,000 mi
0.58x
$50,328
Low-mileage examples carry a real premium in this market: around 622 miles, cars trade at roughly 1.35x the reference value. At the other end, 300,000-mile examples trade at about 0.58x. Implied values here are anchored to this market's True Value.
GT4 Price Forecast
Horizon
Direction
Probability
Regime
Past Accuracy
6 months
↑ UP
51%
volatile
61% over 46 tests
12 months
↑ UP
54%
volatile
55% over 40 tests
24 months
↑ UP
56%
volatile
68% over 28 tests
These are probabilistic direction calls, not price targets. The "Past Accuracy" column is this model's real walk-forward record on the Porsche 718 Boxster/Cayman GT4 — every month we re-run the forecast as if we only knew what was knowable then, and grade it against what actually happened. We publish the hit rate either way. Full methodology & track record →
Where to Buy a GT4
The highest concentration of Porsche 718 Boxster/Cayman GT4 listings is in TX with 138 active listings, followed by FL (128), CA (118), AZ (53), IL (51).
Regional pricing varies significantly. The lowest median price is in GA at $54,664, while PA has the highest at $122,000. Buyers willing to travel or arrange transport may find savings of $67,336.
Top States by Inventory
State
Listings
Median Price
TX
138
$73,990
FL
128
$74,991
CA
118
$79,900
AZ
53
$60,598
IL
51
$78,998
GA
44
$54,664
NC
37
$79,100
CO
34
$75,999
VA
31
$68,998
PA
29
$122,000
GT4 Market Velocity
Porsche 718 Boxster/Cayman GT4 listings spend an average of 63 days on market. This is a slower market. Buyers have negotiating leverage, especially on listings that have been active for 60+ days. Sellers should consider competitive pricing from the start.
The median time on market is 40 days. The lower median suggests most cars sell relatively quickly, while a smaller number of overpriced listings drag up the average.
GT4 Buyer's Guide Summary
Fair price range: $52,790 to $88,970. The median is $70,990. Anything below $52,790 is a strong value; above $88,970 should be premium condition, low miles, or a desirable specification.
Trending down: GT4 prices have dropped 13.4% recently. Patient buyers may benefit from waiting, but desirable examples still sell quickly.
Best value year: The 2017 model year has the lowest median price at $48,984, making it the most accessible entry point into GT4 ownership.
Negotiate: With an average of 63 days on market, sellers are often willing to negotiate. Listings over 60 days old are especially open to offers.
Data sourced from 8 marketplaces including eBay Motors, Bring a Trailer, Cars & Bids,
AutoTrader, CarGurus, Cars.com, Facebook Marketplace, Classic.com, and Hagerty Marketplace.
Updated daily by CarSearch.Pro's automated pipeline.
Browse all 1,000 active GT4 listings.
Read the latest GT4 market analysis.