As of October 2026, CarSearch.Pro's True Value model estimates a typical Porsche 718 Boxster/Cayman GT4 is actually worth $86,200 (fair range $75,900 to $96,600). 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.
Sellers are currently asking a median of $82,900 — about 4% below what these cars have actually been selling for.
Well-supported value · momentum improving — but volatile.
As of October 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 $69,795, with the middle 50% of listings priced between $51,795 and $85,866. GT4 prices have decreased 11.2% over the past quarter, from a median sale price of $86,995 to $77,267.
The typical GT4 on the market has 24,453 miles. Listings spend an average of 59 days on market before selling or being removed.
Current GT4 Pricing
A fair price for a Porsche 718 Boxster/Cayman GT4 in October 2026 is between $51,795 and $85,866 (25th to 75th percentile). Prices range from $43,845 to $97,389 across 1,000 active listings.
Price Distribution (1,000 Active Listings)
Percentile
Price
Meaning
10th
$43,845
Budget / project cars
25th
$51,795
Below average price
Median (50th)
$69,795
Typical market price
75th
$85,866
Above average / premium
90th
$97,389
Top tier / low miles / rare spec
The average asking price is $69,259, which is lower than the median, suggesting pricing is relatively symmetrical across the market.
Price by Mileage
Mileage Range
Listings
Median Price
Under 10,000 mi
272
$89,900
10,000 - 25,000 mi
232
$78,697
25,000 - 50,000 mi
259
$58,499
50,000 - 100,000 mi
218
$45,899
100,000 - 150,000 mi
7
$35,395
GT4 Price Trends
Porsche 718 Boxster/Cayman GT4 prices have decreased 11.2% over the past quarter. In 2026-Q4, the median sale price was $77,267 across 96 sales, down from $86,995 in 2026-Q3.
GT4 Quarterly Sale Prices (Historical)
Quarter
Sales
Median Price
Average Price
2026-Q2
480
$97,500
$114,918
2026-Q3
424
$86,995
$105,092
2026-Q4
96
$77,267
$98,138
Best Value GT4 by Model Year
The 2017 GT4 offers the best value with a median price of $49,500 across 151 listings. The most expensive model year is 2025 at a median of $93,697.
Median Price by Model Year
Year
Listings
Median Price
Min
Max
2016
1
$62,990
$62,990
$62,990
2017
151
$49,500
$26,972
$71,995
2018
214
$50,700
$29,996
$90,959
2019
132
$55,354
$32,500
$95,959
2020
16
$59,999
$52,699
$67,991
2021
87
$71,998
$18,000
$104,999
2022
58
$75,998
$48,604
$106,378
2023
40
$76,293
$59,906
$106,499
2024
164
$85,716
$61,075
$105,611
2025
136
$93,697
$54,000
$106,125
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 8,086 miles:
Odometer (approx.)
Value Multiplier
Implied Value
655 mi
1.39x
$120,084
4,656 mi
1.05x
$90,176
10,739 mi
1.00x
$86,255
19,673 mi
0.68x
$58,287
38,005 mi
0.57x
$49,189
60,862 mi
0.53x
$45,535
88,402 mi
0.58x
$49,681
154,919 mi
0.66x
$57,211
300,000 mi
0.58x
$50,080
Low-mileage examples carry a real premium in this market: around 655 miles, cars trade at roughly 1.39x 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
56%
volatile
62% over 47 tests
12 months
↑ UP
60%
volatile
68% over 41 tests
24 months
↑ UP
66%
volatile
93% over 29 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 FL with 167 active listings, followed by TX (130), CA (129), IL (61), AZ (41).
Regional pricing varies significantly. The lowest median price is in TX at $59,995, while SC has the highest at $99,993. Buyers willing to travel or arrange transport may find savings of $39,998.
Top States by Inventory
State
Listings
Median Price
FL
167
$68,395
TX
130
$59,995
CA
129
$77,117
IL
61
$79,412
AZ
41
$67,991
GA
41
$61,199
NJ
40
$84,790
WA
31
$70,000
NY
30
$83,990
CO
28
$74,998
GT4 Market Velocity
Porsche 718 Boxster/Cayman GT4 listings spend an average of 59 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 34 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: $51,795 to $85,866. The median is $69,795. Anything below $51,795 is a strong value; above $85,866 should be premium condition, low miles, or a desirable specification.
Trending down: GT4 prices have dropped 11.2% 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 $49,500, making it the most accessible entry point into GT4 ownership.
Take your time, but don't delay: Average days on market is 59. You have some time to research, but the best deals still go fast.
Data sourced from 7 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.