WTI vs Brent: the two oil benchmarks compared

WTI vs Brent: both are light, sweet crude oils used as price benchmarks, but WTI (West Texas Intermediate) is priced for delivery at an inland US storage hub in Cushing, Oklahoma, while Brent is a North Sea blend priced where it loads onto tankers. Brent usually costs a few dollars more a barrel, and that gap, the Brent minus WTI spread, is one of the most watched numbers in energy.

This explainer compares the two benchmarks, explains why the spread moves, and shows it in TickerLayer data from September 2026. For endpoints, units and code, start with the oil price API guide.

Brent vs WTI at a glance

"Light" means low density, which yields more gasoline and diesel per barrel. "Sweet" means little sulfur, which makes refining cheaper. On quality alone WTI is marginally the better crude, and yet it usually sells for less. The explanation is geography, not chemistry.

Why Brent usually costs more than WTI

A barrel is worth what a refinery will pay for it once delivered. Brent is already on the water and can sail to Rotterdam, Singapore or the US Gulf Coast. A barrel of WTI sits hundreds of kilometers inland and has to be piped to the coast before it can go anywhere else, so its price carries the cost, and the capacity limits, of that trip.

When US production grows faster than the pipelines to the coast, inland crude piles up at Cushing and WTI trades at a deep discount. When pipes are plentiful and exports flow freely, the discount shrinks toward the cost of shipping a barrel across the Atlantic. Refinery outages, storage levels and freight rates move it day to day.

1. 12011: the shale glutUS output outgrew the pipelines out of Cushing, and Brent traded more than $20 a barrel above WTI at times.
2. 22015: exports reopenThe US lifted its crude export ban at the end of 2015, giving inland barrels a route to world markets and narrowing the discount.
3. 32020: below zeroOn 20 April 2020 the expiring May WTI contract settled at minus $37.63 as storage at Cushing ran short. Brent, priced on the water, stayed positive.
4. 42023: WTI joins BrentUS crude delivered into Europe became one of the grades in the Brent basket, tying the two benchmarks more closely together.

The Brent minus WTI spread in September 2026

For three weeks the spread sat in its familiar band, between about $3 and $5 a barrel, even while both benchmarks rallied around 20% into mid-month. Then it widened to $12.30 in three sessions.

Part of a move like that can be the market: a disruption to seaborne supply lifts Brent first, and inland WTI follows only as fast as pipelines and export docks allow. Part of it can be the calendar. The chart marks the date that matters for the second reason, the last trading day of the October WTI contract.

Why front-month spreads mislead: the contract calendar

Both benchmarks are futures-driven, and their contracts expire on different schedules. WTI trading for a delivery month ends three business days before the 25th of the previous month; Brent ends on the last business day of the second month before delivery. So a "front month minus front month" spread compares two different delivery months for most of every month.

While the months differ, the spread silently includes the slope of the curve between them. In a backwardated market, where the nearer month is the dearer one, a front WTI contract that is a month closer to delivery than the front Brent contract makes the spread look narrower than it really is. When WTI rolls onto the same month as Brent, that hidden slope drops out and the spread appears to jump.

How large the calendar effect is depends on how steep the curve is between the two months, which is what the contango and backwardation explainer is about.

Track both benchmarks by API

Both symbols sit in the commodities API under the same routes. The script below pulls daily bars for both, keeps Monday to Friday (weekend bars are thin, because the reference pauses from Friday evening to Sunday evening New York time), lines them up by date and prints the spread. It needs Python 3.9 or newer and pip install requests.

import os
from datetime import datetime, timezone

import requests

API = "https://api.tickerlayer.com"
HEADERS = {"x-api-key": os.environ["TICKERLAYER_API_KEY"]}


def daily_closes(symbol: str, start: str, end: str) -> dict:
    """Map each UTC date (Monday to Friday) to that day's closing price."""
    url = f"{API}/commodities/agg/{symbol}/1/day/{start}/{end}"
    params = {"sort": "asc", "limit": 5000, "offset": 0}
    closes = {}
    while True:
        r = requests.get(url, params=params, headers=HEADERS, timeout=15)
        r.raise_for_status()
        body = r.json()
        for bar in body["results"]:
            day = datetime.fromtimestamp(bar["t"] / 1000, tz=timezone.utc)
            if day.weekday() < 5:  # weekend bars are thin; keep trading days
                closes[day.date().isoformat()] = bar["c"]
        if body.get("next_offset") is None:
            return closes
        params["offset"] = body["next_offset"]


wti = daily_closes("WTIUSD", "2026-09-13", "2026-09-25")
brent = daily_closes("BRENTUSD", "2026-09-13", "2026-09-25")

for day in sorted(wti.keys() & brent.keys()):
    spread = brent[day] - wti[day]
    print(f"{day}  WTI {wti[day]:7.2f}  Brent {brent[day]:7.2f}  Brent-WTI {spread:6.2f}")

2026-09-14  WTI  101.86  Brent  106.21  Brent-WTI   4.35
2026-09-15  WTI  105.47  Brent  108.45  Brent-WTI   2.98
2026-09-16  WTI  102.01  Brent  105.49  Brent-WTI   3.48
2026-09-17  WTI  101.06  Brent  104.05  Brent-WTI   2.98
2026-09-18  WTI   99.59  Brent  103.28  Brent-WTI   3.69
2026-09-21  WTI   95.43  Brent  100.07  Brent-WTI   4.64
2026-09-22  WTI   89.86  Brent   98.59  Brent-WTI   8.73
2026-09-23  WTI   92.70  Brent  103.48  Brent-WTI  10.78
2026-09-24  WTI   94.78  Brent  107.08  Brent-WTI  12.30
2026-09-25  WTI   92.42  Brent  104.49  Brent-WTI  12.08

Widen the dates to any range your plan covers, or feed the closes into a correlation matrix alongside other assets. Both benchmarks also have public pages, WTI crude and Brent crude, shown 15 minutes delayed.

Which benchmark should your app use?

• WTI for US-centric workUS fuel prices, US producers and refiners, and anything priced around the US inland market.
• Brent for the rest of the worldEuropean and Asian markets, seaborne trade, and most contracts that mean "the oil price" outside the US.
• Both for the spreadThe difference is its own signal: pipeline bottlenecks, export flows and regional supply shocks show up there first.

Whichever you pick, label it. A chart titled "Oil" that silently switches from one benchmark to the other can move $10 without a single real price change.