Scan: Iran-Oman Hormuz Agreement by September 30?

1. Planner Fable 5.1 · Fermi decomposition + tool plan

Tools chosen: polymarket_direct polymarket_related kalshi_related article_search claude_news gdelt_news wikipedia

Sub-questions (Fermi decomposition)

What is the current status of shipping traffic in the Strait of Hormuz as of August 2026 — is Iran restricting, tolling, or corridor-managing vessel traffic, and what triggered the crisis?
Are Iran and Oman publicly engaged in bilateral negotiations over a Hormuz traffic-management arrangement, and have officials described a draft, framework, or expected signing timeline?
Have Iranian or Omani officials made any statements in the past 30 days indicating acceptance of, or imminent conclusion of, an agreement on Hormuz vessel corridors or fee collection?
Is a broader US-Iran or multilateral (GCC/UN) Hormuz deal being negotiated that could either subsume or crowd out a separate Iran-Oman bilateral agreement before September 30?
What do related Polymarket and Kalshi markets (Hormuz reopening, US-Iran deal, Iran ceasefire) imply about the probability of a diplomatic resolution by end of September?
Historically, how quickly have Gulf maritime/diplomatic negotiations of this type moved from public talks to a formally announced agreement, and how has this market's price trended since launch?

Planner reasoning

This is a diplomacy-by-deadline question hinging on whether Iran and Oman formally announce a joint Hormuz traffic-management agreement within ~8 weeks. The key drivers are the current state of Hormuz disruption, whether concrete bilateral talks are underway (and how advanced), whether a broader US-Iran or multilateral deal would supersede a bilateral Iran-Oman instrument, and how the market and adjacent Hormuz/Iran markets are pricing the situation.

2. Research Parallel tool calls

tool	status	time	items	summary
polymarket_direct	OK	0.2s	1	## This Market's Polymarket Data Iran-Oman Hormuz Agreement by September 30? - Current price (probability): 19.00% - 7-day price change: -12.00% - 30-day price change: -42.00% - Total volume: $631,527 (USD notional) - Price range: 14.00% - 79.00% - Data points: 35 days
polymarket_related	OK	6.8s	3	Scanned 100 active Polymarket markets, kept 3 matches. keyword 'Hormuz': 3 markets \| keyword 'Iran Oman': 0 markets \| keyword 'Iran deal': 0 markets \| keyword 'Strait of Hormuz': 0 markets
kalshi_related	OK	6.7s	2	2 related markets / summaries. keyword 'Hormuz': no matches \| keyword 'Iran Oman': ok \| keyword 'Iran agreement': ok
article_search	OK	0.8s	24	Fetched 24 unique articles across 4 queries (lookback=45d). 'Iran Oman Strait of Hormuz agreement negotiations': 10 articles \| 'Strait of Hormuz shipping traffic Iran fees corridor': 10 articles \| 'Oman mediation Iran Hormuz talks': 10 articles \| 'US Iran Hormuz deal talks': 10 articles
claude_news	OK	22.8s	13	Based on research into the Iran-Oman Hormuz situation as of mid-September 2026: - Fee/toll status: Iran has already been informally charging transit fees, reportedly up to $2 million per voyage on some vessels on an "ad hoc basis," creating an informal toll system, though enforcement is not uni
gdelt_news	OK	119.5s	20	GDELT: 20 articles across 3 queries (lookback=30d). 'Iran Oman Hormuz agreement': error GDELT rate-limited after retries (429) \| 'Hormuz shipping corridor Iran': 10 hits \| 'Oman Iran maritime talks': 10 hits
wikipedia	OK	0.2s	2	Fetched 2 Wikipedia entries (0 missing pages).

3. Evidence Brief Sonnet 5 · 6925 chars

# Current state As of Sept 13, 2026, Iran and Oman have reportedly finalized technical details of a temporary Hormuz shipping corridor (7-mile-wide route, coordinates agreed since late August) and Iran plans to "unveil" the agreement to Gulf nations around Sept 14-15 (Bloomberg). No qualifying joint declarative acceptance statement from both governments has yet been confirmed — talks remain described as "final stage," "close," or "imminent" repeatedly since early August without a definitive announcement, and Iran insists any deal is separate from full strait reopening. # Timeline of key events - 2026-02-28: US/Israel strikes on Iran begin 2026 Iran War (confirmed, Wikipedia/background). - 2026-06 (mid): US-Iran ceasefire/MOU signed, later lapsed (reported, claude_news). - 2026-07-30: Reports surface of toll/fee concept for Hormuz transit as a possible off-ramp (CNN, reported). - 2026-08-05: Iran FM spokesman says Iran-Oman have agreed on coordinates of a proposed safe route; talks "final stage" (CNN/CNBC, reported). - 2026-08-06: Reported deal would restrict US/Israeli vessels; unnamed official says UN IMO/US to be involved in announcement, Gulf official says GCC endorsed draft (CNBC, reported — unconfirmed by governments). - 2026-08-08: Iran says deal with Oman close but won't reopen strait absent US concessions/war damages (WaPo/BBC, reported). - 2026-08-10: Araghchi: negotiations "final stage"; Oman confirms "positive, constructive" atmosphere (CNBC, reported). - 2026-08-12: Vessel traffic near 3-month low, ~90% below pre-war baseline (CNBC/Kpler data, confirmed). - 2026-08-17–19: Trump reportedly threatens to bomb Oman if it "gets in the way" (multiple outlets, reported). - 2026-08-25–27: Iran and Oman announce agreement on a temporary 7-mile corridor (entry/exit through Iranian waters); joint statement referenced; Qatar/GCC also consulted; IRGC says strait won't reopen unless US meets conditions (Al Jazeera/GDELT cluster, reported/moderately confirmed — multiple independent outlets corroborate the corridor agreement, though not full diplomatic ratification). - 2026-09-07: Iran says deal with Oman "just days away" (Bloomberg, reported). - 2026-09-13: UAE-Iran leaders meet; Iran set to unveil the Hormuz agreement to Gulf nations "on Monday" (~Sept 14-15) (Bloomberg, reported — most recent, not yet confirmed as finalized/declarative). # Event Will Iran and Oman announce a qualifying diplomatic agreement on Hormuz vessel traffic management by Sept 30, 2026? # Outcomes to forecast - Yes - No # Kalshi market anchor No kalshi_direct price was returned in research (gap). Closest comparable is Polymarket's identical-ticker market: **19% YES**, down sharply from a 79% high, -12% over 7 days, -42% over 30 days; $631K volume across 35 days — a strong downward trend despite repeated "final stage" rhetoric. # Sub-question answers 1. **Shipping status/trigger** — Traffic is ~90% below pre-war levels (13 vessels/5-day avg vs. 130 baseline); crisis triggered by Feb 28, 2026 US/Israel strikes on Iran and subsequent Iranian attacks on vessels/blockade threats (CNBC/Kpler). 2. **Bilateral negotiations status** — Yes, active since July/August 2026; Iran and Oman have agreed on route coordinates and a 7-mile temporary corridor (entry/exit in Iranian waters) as of late August (Al Jazeera, CNBC). 3. **Recent statements (last 30 days)** — Sept 7: Iran says deal "just days away" (Bloomberg). Sept 13: Iran to formally unveil the agreement to Gulf states ~Sept 14-15 following UAE-Iran meeting (Bloomberg). No declarative joint acceptance confirmed yet. 4. **Broader US/multilateral deal** — A separate US-Iran/GCC track exists (UN IMO reportedly to be involved per one unnamed official); Trump has repeatedly claimed a deal is imminent but US is not party to the Iran-Oman bilateral talks and remains skeptical/threatening (bombed Oman warning); GCC "endorsement" reported but unconfirmed officially. 5. **Related markets** — Polymarket "Iran-Oman Hormuz Agreement by Sept 14": only 1.3% YES. "Hormuz traffic normal by Sept 15": 0.05% YES. "Hormuz traffic normal by Dec 31": 17.5% YES. All signal deep skepticism a clean qualifying deal materializes soon. 6. **Historical pace / price trend** — This market fell from a 79% high to 19% over 30 days despite continuous "close"/"final stage" claims since Aug 5 — a pattern of repeated over-promising without formal signing, consistent with Gulf diplomacy's slow, stop-start history. # Key facts (high-confidence, factual) 1. [Bloomberg] Iran plans to unveil Hormuz corridor agreement to Gulf nations ~Sept 14-15, 2026. 2. [CNBC/Kpler] Vessel traffic through Hormuz down ~90% vs. pre-war average as of Aug 12. 3. [Al Jazeera/GDELT] Iran-Oman agreed on a temporary 7-mile corridor route by Aug 26. 4. [Washington Post/BBC] Iran repeatedly states any Oman deal ≠ full strait reopening; conditions tied to US concessions/war damages. 5. [Polymarket] This event's own market down from 79% to 19% over 30 days. # Cross-market signals - Kalshi related: No direct Hormuz-agreement match found; unrelated markets (Romania PM, US-China FTA) offer no signal. - Polymarket: Identical-ticker market at 19% (falling); "by Sept 14" variant at just 1.3%, "traffic normal by Sept 15" at 0.05% — all bearish on near-term formal resolution. - Sportsbook implied: N/A. # Analyst opinions and speculation - CNN (Aug 5): "plans...change almost daily," skepticism on durability even if announced. - Defa Press (Iran military-linked): full replacement of 58-year-old traffic scheme could take 30-60 more days beyond any interim deal. - Multiple outlets note deal is explicitly NOT full reopening — raising interpretive risk over whether it "qualifies" under Kalshi's strict declarative-acceptance rule. # Directional lean per outcome - **Yes**: Corridor technical terms reportedly finalized; unveiling imminent (~Sept 14-15); leaves ~2 weeks before close plus 14-day grace period for confirmation. - **No**: Pattern of serial "imminent" claims since Aug 5 without actual signing; US opposition/Trump threats could scuttle Omani follow-through; Iran conditions (war damages, US exclusion) complicate a "clean" qualifying joint declarative statement; Polymarket pricing (19%, falling; adjacent Sept 14 market at 1.3%) strongly favors No. # Gaps / unknowns - No kalshi_direct YES price was retrieved — using Polymarket (19%) as best proxy anchor. - Unclear whether the "unveiling" to Gulf states constitutes the qualifying bilateral Iran-Oman declarative acceptance, or merely a briefing/non-binding presentation. - Whether Oman will issue its own confirmatory statement remains unconfirmed. # Calibration anchors - Polymarket proxy YES price: 19% (falling sharply, -42% 30d). - Adjacent near-term Polymarket market (by Sept 14) at 1.3% YES suggests low near-term confidence, though this question has 16 more days plus a 14-day resolution grace window.

4. Forecasters Fable 5.1 + GPT-5.6 Sol · in parallel

claude-fable-5-1

44% conf

Yes	21%
No	79%

The best available anchor is Polymarket's identical market at 19% YES, down from a 79% high despite Iran repeatedly claiming a deal is in the 'final stage' or 'days away' since Aug 5 — a pattern of serial over-promising without a formal joint declarative signing. The Sept 13 Bloomberg report of an 'unveiling' to Gulf states around Sept 14-15 is fresh and offers some upside, but the adjacent 'by Sept 14' market at 1.3% indicates traders don't expect that unveiling to qualify, and it's unclear whether Oman will issue a confirmatory declarative statement. Iran's insistence that the corridor is distinct from full reopening and tied to US concessions, plus Trump's threats toward Oman, add interpretive and political risk to a clean qualifying announcement. With ~16 days remaining plus a grace window, I nudge slightly above the anchor to 21% but remain firmly on No.

gpt-5.6-sol

66% conf

Yes	22%
No	78%

Active negotiations and agreement on the corridor’s coordinates point toward Yes, while the roughly 90% traffic decline creates strong pressure for an interim arrangement. Bloomberg’s report that Iran plans to unveil the agreement around September 14-15 modestly raises the forecast above the 19% Polymarket proxy anchor. However, repeated claims since August that an agreement was in its “final stage” have not produced an unambiguous joint acceptance statement, and Oman’s own confirmation remains uncertain. The market’s sharp decline from 79% to 19%, together with Iranian conditions and interpretive risk around whether an unveiling qualifies, leaves No strongly favored.

5. Devil's Advocate Sonnet 5 · red-team critique

Both forecasts converge almost identically (21% and 22%) around the Polymarket anchor without meaningfully engaging with the "by Sept 14" market at 1.3% YES, which arguably captures the exact Sept 14-15 unveiling event referenced as the main upside catalyst — this suggests the anchor-adjustment logic is internally inconsistent, since if traders pricing that specific near-term event see only 1.3%, the modest "nudge above 19%" for the broader Sept 30 window may be too generous rather than too conservative.

Neither forecast addresses the Defa Press datapoint that "full replacement of the 58-year-old traffic scheme could take 30-60 more days beyond any interim deal" — this is directly relevant to whether any Sept 14-15 unveiling would constitute a qualifying "agreement" versus a preliminary/interim briefing, and neither analysis weighs how this timeline mismatch affects resolution risk.

Both forecasts treat the 14-day resolution grace window as a modest tailwind but don't quantify it — given the close time is Oct 1 2026 03:59Z and the event closes Sept 30, this grace period could meaningfully extend the effective window for confirmation of an unveiled-but-not-yet-formalized deal, and this is underexplored as a source of upside beyond the Polymarket anchor.

Neither forecaster grapples with the specific interpretive/resolution risk flagged in the brief: "multiple outlets note deal is explicitly NOT full reopening — raising interpretive risk over whether it 'qualifies' under Kalshi's strict declarative-acceptance rule." This is arguably the single largest source of uncertainty (a technical corridor deal could be announced and confirmed, yet still fail to resolve YES on strict wording), and both forecasts subsume it vaguely into "interpretive risk" without adjusting probability mass toward No more decisively.

Both forecasts anchor to Polymarket's 19% but the brief explicitly notes "No kalshi_direct YES price was returned" — using a different platform's price as ground truth without adjustment for potential liquidity/thinness ($631K over 35 days is not huge) or platform-specific trader composition is a reference-class assumption neither forecaster interrogates.

Neither forecast considers the scenario where Oman "unveils" the deal but does so unilaterally or via GCC channel without a matching Iranian joint declarative statement (or vice versa) — the brief's Sept 13 note that Iran plans to unveil "to Gulf nations" (not jointly with Oman specifically) suggests the format of the announcement may not cleanly satisfy a bilateral Iran-Oman question, a scenario both forecasts implicitly conflate with a qualifying joint statement.

6. Aggregator Fable 5.1 · final calibrated forecast

18% (55% confidence)

Yes: 18% No: 82%

The Polymarket identical-ticker market at 19% (falling from 79%) already incorporates the Sept 13 Bloomberg 'unveiling' report, so the forecasters' nudge above the anchor double-counts that catalyst; the adjacent 'by Sept 14' market at 1.3% shows traders do not expect the Gulf-states unveiling to constitute a qualifying bilateral Iran-Oman declarative statement. The critique correctly highlights unaddressed downside: the deal is explicitly not a strait reopening and is tied to US concessions, the announcement format appears to be a briefing to Gulf nations rather than a joint Iran-Oman signing, and Defa Press suggests the formal traffic scheme is 30-60 days out. Serial 'final stage' claims since Aug 5 without a signed instrument, plus US pressure on Oman, reinforce the pattern of slippage. The 16 remaining days and grace window keep Yes materially above zero, but I land slightly below the anchor at 18%.

Pipeline Timing

Total pipeline time: 230.8s

Per-tool research timings shown in the Research section above.