Oil prices dropped sharply on August 3, 2026. The reason? Markets got optimistic that the United States and Iran might be close to a deal to reopen the Strait of Hormuz, a narrow stretch of water between Iran and Oman. About one in every five barrels of the world's daily oil and gas supply passes through it — or did, before shipping disruptions began (The National; Reuters).

But the same day, Iran said: not so fast. Foreign Ministry spokesman Baghaei said on August 3 that a shipping understanding between Iran and Oman does not amount to reopening the strait, which he said stays closed because the US broke its treaty commitments (PressTV). Separately, Baqaei stated that the Strait of Hormuz will not return to its pre-war status, as of February 28, under any circumstances (IRNA).

So what is the market actually excited about? Back in June 2026, a deal was first reported: Iran would dilute its enriched uranium, the US would temporarily lift some sanctions, and the strait would reopen, according to US officials (LA Times). A 14-point agreement focused on reopening the strait under "Iranian arrangements" (PressTV).

But Iran has consistently said any reopening depends on the US keeping its promises, which Iran says Washington has repeatedly broken. Iranian state media reported on July 13 that reopening hinges on Washington honoring its commitments (PressTV). On July 8, Iran threatened to close the strait and strike twice as many targets in response to a new US attack, while saying the strait would stay open to friendly nations under rules set by the Persian Gulf Strait Authority (PressTV). Iran also said foreigners have no stake in the strait and warned that US shipping interference could disrupt gradual reopening (IRNA). Iran's UN envoy said the only real solution is a permanent end to the war, lifting of the naval blockade, and restoration of normal shipping (IRNA).

This back-and-forth has been going on for months. In June 2026, fighting between the US and Iran threatened the reopening and pushed oil prices up (Al Jazeera). On June 28, Iranian Foreign Minister Abbas Araghchi said only Iran controls reopening the strait, and that under the deal it would be back to pre-war capacity within 30 days under Iran's management (PressTV). That 30-day window passed with no reopening. As recently as July 31, oil prices were expected to keep rising because of shipping disruptions in the strait and Red Sea attacks by Iran-backed Houthis (Reuters.

Here's where the numbers stand. On July 9, Brent crude — the benchmark price for most internationally traded oil — fell $1.72, or 2.2%, to settle at $76.30 a barrel, as economic worries outweighed supply fears that day (Reuters). A Reuters poll of analysts projected Brent would average $84.50 per barrel over all of 2026, and the US benchmark, WTI, would average $79.49 — those forecasts came down because the strait's anticipated reopening was expected to ease supply concerns (Reuters). In mid-June, Reuters reported that oil prices would likely fall if the strait reopened that Friday after a US-Iran deal (Reuters). That Friday came and went with no reopening.

Iran is also talking with Oman about setting up a temporary shipping corridor in the strait — a single two-way route (IRNA). This appears to be the "shipping understanding" Baghaei mentioned on August 3, and he was careful to say it is not the same thing as reopening the strait.

The broader context here is that the market is betting on something one side of the negotiation is publicly denying on the same day. The August 3 price drop reflects a gamble that diplomacy is moving toward reopening the strait. But Iran's own spokespeople are saying the opposite: the strait is closed, the old rules are gone, and reopening depends on US actions that Iran calls treaty violations. Think of it like a house price rising because buyers heard a new road might be built — but the city council said the same day that no road has been approved. The price moved, but it moved on a hope that the other party has not confirmed. For anyone watching their fuel costs or energy investments, that gap between $76.30 oil and the $84.50 analysts expected for the year tells you the market has already priced in a reopening. Whether that bet pays off depends on which side of this disagreement turns out to be right.