Goldman Sachs Slashes Q4 2026 Brent Forecast to $80, Widening the Gap With Wood Mackenzie at $90 as WCS Settles at $70.01

Goldman Sachs on Wednesday cut its Q4 2026 Brent crude forecast to $80 per barrel from $90, citing accelerated progress in reopening Persian Gulf shipping lanes. Lead commodities strategist Daan Struyven advanced Goldman's supply normalization timeline by one month, from end-August to end-July. Each month gained in that timeline reduces Goldman's Q4 fair-value estimate by roughly $10 per barrel and its 2027 estimate by roughly $5 per barrel. Goldman also trimmed its 2027 Brent average forecast to $75 per barrel and its 2027 WTI average to $70 per barrel.

Brent crude settled at $87.37 per barrel on Wednesday on the ICE, down 1.30% on the day, per TradingEconomics. WTI crude settled at $80.78 per barrel on the CME, down 1.92%. Western Canadian Select traded at $70.01 per barrel as of Wednesday, according to OilPriceAPI, placing the WCS-WTI differential at $10.77 per barrel. Goldman's revised Q4 Brent ceiling of $80 sits $7.37 below Wednesday's ICE settlement, implying further downside ahead if its supply assumptions hold.

Wood Mackenzie Holds at $90 as the Analyst Gap Widens

Wood Mackenzie maintained its full-year 2026 Brent forecast at $90 per barrel in its mid-year outlook, citing ongoing Hormuz-related supply losses and a capital-cautious industry response. The firm noted that Brent averaged $91 per barrel through the first six months of 2026, keeping its annual target mathematically intact despite the expected second-half price slide. Goldman's $80 Q4 forecast sits $10 below Wood Mackenzie's full-year call, putting two major research houses on opposite sides of the Hormuz recovery debate. That gap is driven primarily by disagreement over how fast Persian Gulf output returns to pre-conflict levels.

Struyven acknowledged two-sided risks in Goldman's note, writing that "some security premium compensating for disruption risk is likely to keep a floor under prices." Goldman's scenario analysis extends from a $130 per barrel upside case if Hormuz disruptions persist to a sub-$60 per barrel 2027 downside if recovery accelerates faster than anticipated. Wood Mackenzie has not published a revised Q4 target since its mid-year report, leaving its $90 full-year figure as the firm's standing position. Bernstein Research holds a 2026 base assumption of $80 per barrel, with an extreme scenario reaching $120 to $150.

IEA August Data Challenges Goldman's Recovery Timeline

The IEA's August 2026 Oil Market Report provides quantitative grounds for skepticism about Goldman's accelerated normalization assumption. Gulf oil production reached 23.9 million barrels per day in July, but remained 8.3 million barrels per day below pre-war output levels, according to the IEA. Gulf exports fell 2.1 million barrels per day to 15 million barrels per day in early July after the Strait of Hormuz was effectively closed again as tankers and oil infrastructure came under renewed attack. The IEA noted global oil supply rose 2.4 million barrels per day in July to 101.5 million barrels per day, but remained 6.3 million barrels per day below year-ago levels.

World oil demand is forecast to decline 1.6 million barrels per day in 2026, the IEA said, 510,000 barrels per day more than its prior estimate. Demand contractions are projected to ease from 4.9 million barrels per day in Q2 2026 to 2.8 million barrels per day in Q3, before returning to growth in Q4. Global oil supply is projected to decline 4.3 million barrels per day on average in 2026 and rebound 8.3 million barrels per day in 2027 to 110.3 million barrels per day. The IEA data suggests the supply overhang Goldman cites has not yet materialized at the volumes or pace its timeline assumes.

WCS Sensitivity: What the $10 Analyst Gap Means for Alberta Producers

The Goldman-Wood Mackenzie Brent gap flows directly into Western Canadian Select prices, shaping netbacks for Alberta oil sands producers. At the current Brent-WTI spread of $6.59 per barrel and WCS-WTI differential of $10.77 per barrel, Goldman's $80 Q4 Brent scenario would put WTI near $73 per barrel and WCS near $62 per barrel. Wood Mackenzie's $90 Brent scenario, holding the same differentials, would place WCS near $73 per barrel. For every barrel of WCS produced, operators realize roughly $11 more gross revenue under Wood Mackenzie's scenario than under Goldman's Q4 case.

Oil sands operators including Suncor, Canadian Natural Resources, and Cenovus benchmark a significant share of their crude to WCS, making the $10 per barrel Brent divergence a material planning variable. Cenovus acquired Husky Energy's upstream assets in 2021, deepening its WCS exposure across western Canada. Wood Mackenzie noted in its mid-year outlook that even at $91 per barrel H1 Brent, capital budgets barely moved across the 49 largest operators it tracks. That discipline keeps the supply growth needed to confirm Goldman's bearish scenario from materializing, which is the central tension in the current market. Either Goldman is early, or Wood Mackenzie is slow to revise.

Oil Authority reported earlier this week that Brent entered a three-session slide driven by Iran-Oman corridor talks signaling eased supply constraints. Goldman's revised forecast, published Wednesday, follows that slide and provides a bank-level rationale for continued downside. Whether the IEA's August data or Goldman's forward assumptions better reflect the actual state of Persian Gulf recovery will determine which forecast proves closer to right.