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OPEC crude output falls to lowest level in decades amid US blockade of Iran
A naval blockade, intensified sanctions, and the UAE's dramatic exit have slashed OPEC production by more than 30%, sending oil markets into a state of sustained uncertainty.
OPEC’s crude oil production cratered to 16.33 million barrels per day in May 2026, according to a Bloomberg survey. That’s the lowest output the cartel has recorded in over three decades, and it represents a month-over-month decline of 1.22 million barrels per day.
The culprit is a familiar one, just turned up to eleven: US sanctions on Iran, now reinforced by an active naval blockade that has choked off Iranian crude exports to a trickle. Iranian production fell to 2.34 million barrels per day, a drop of 710,000 barrels per day and a five-year low for the country. Iranian crude and condensate exports slipped below 300,000 barrels per day, the lowest figure in at least six years.
How OPEC lost a third of its output
Since the Iran conflict began escalating in early 2026, the group’s total output has shrunk by roughly 9.7 million barrels per day across multiple Gulf producers, representing a decline of more than 30%.
The US-Israel conflict with Iran has been the primary accelerant. The Strait of Hormuz, through which approximately one-third of the world’s seaborne oil trade passes, has become a focal point of regional tensions.
In May 2026, the United Arab Emirates formally left OPEC after six decades of membership.
Oil prices and the volatility trap
As of June 5, 2026, crude was trading around $90.54 per barrel.
The sanctions regime targeting Iran has its roots in the 2018 US withdrawal from the JCPOA. The current naval blockade represents a qualitative escalation beyond previous rounds, involving physical interdiction of oil shipments rather than purely financial sanctions.
What this means for investors
Sustained oil prices above $90 feed directly into inflation expectations. Central banks that were beginning to ease monetary policy now face a commodity-driven complication that makes rate decisions harder.
The UAE’s departure after 60 years signals that the organization’s internal politics have reached a breaking point. A weakened OPEC means less coordinated supply management, which could mean more volatility in both directions.