Tools chosen: polymarket_direct polymarket_related kalshi_related fred claude_news claude_news code_execution

Sub-questions (Fermi decomposition)

Planner reasoning

This is the 'Other' bucket of a Polymarket multi-outcome event enumerating combinations of cut/pause/hike across the June, July, and September 2026 FOMC meetings, so YES essentially requires a combination not among the listed ones (including any hike). The key inputs are the current Polymarket price for this leg, the prices of the enumerated sibling combinations (which must sum with it to ~1), Kalshi's per-meeting rate probabilities for cross-venue triangulation, and macro data/news on hike risk.

# Current state Two of three FOMC decisions in this market's window are already resolved and identical: June 17, 2026 held the target range at 3.50–3.75% (unanimous 12-0), and July 29, 2026 also held at 3.50–3.75% (9-3, with three dissents favoring a hike). The outcome now hinges entirely on the September 15-16, 2026 meeting: if the Fed holds again, all three decisions match → resolves "No"; if it cuts or hikes, the sequence differs → resolves "Yes." # Timeline of key events - 2026-05-13 (confirmed): Senate confirms Kevin Warsh as Fed Chair (54-45), succeeding Powell (who stays as governor). - 2026-05-22 (confirmed): Warsh takes office as Fed Chair. - 2026-06-17 (confirmed): FOMC holds rate at 3.50-3.75%, unanimous 12-0; dot plot turns hawkish, 2026 median moves to 3.8% (implies a hike by year-end); 17/18 officials see inflation risk skewed upside. - 2026-07-23 (reported): Fed funds futures hike-odds for September spike to ~82% (from ~53%) amid oil surge tied to US-Iran conflict. - 2026-07-29 (confirmed): FOMC holds at 3.50-3.75%, 9-3 vote; Hammack, Kashkari, Logan dissent in favor of a 25bp hike — first 3-way unified dissent since Sept 2016. - early 2026-08 (reported): Temporary US-Iran de-escalation lowers oil prices, cooling hike odds; Kalshi September contract (KXFEDDECISION-26SEP) shows ~65% hold / ~34% hike. - 2026-09-15/16 (scheduled): FOMC meeting with new SEP/dot plot due — the deciding meeting for this market. # Event Will the June, July, and September 2026 FOMC decisions NOT all be identical (i.e., contain a divergent hold/cut/hike combination)? # Outcomes to forecast Yes (decisions differ) / No (all three decisions identical) # Kalshi market anchor No direct Kalshi ticker for this exact "differ" question was found (kalshi_related returned 0 relevant matches for KXFED/KXFEDDECISION series). Primary anchor is Polymarket: **40% YES** (as of latest), down 8.5pts over 7 days and 5.5pts over 30 days, off a 90-day high of 63% and low of 8.5%; volume $299,602. The related Kalshi September single-meeting market (KXFEDDECISION-26SEP) implies ~65% hold / ~34% hike for the swing meeting. # Sub-question answers 1. **Polymarket "Other/differently" leg** — This market itself is priced at 40% (down from a 63% peak, per polymarket_direct); no separate "Other" leg was found, this appears to be the sole binary Yes/No market for the composite question. 2. **Sibling combination outcomes** — None found; polymarket_related and kalshi_related searches returned 0 matching sibling markets, so "Other = 1 minus sum" cannot be computed directly from data. 3. **Kalshi/Polymarket implied per-meeting odds** — June and July are resolved facts (both hold). For September, Kalshi shows ~65% hold, ~34% hike, ~1% residual (claude_news); CME/fed-funds-futures-style trackers diverged from 53%→82% hike odds around July 23 before easing back after Iran de-escalation. 4. **Current rate level & recent path** — Upper bound = 3.75% (DFEDTARU, confirmed Aug 2026), range 3.50-3.75% since ~Dec 2025/lowest since Nov 2022; 2026 to date has been all holds (June, July), no hikes or cuts delivered in the trailing 12 months per available data. 5. **Inflation/labor/yields implications** — Headline CPI yoy ≈2.9% (Aug'25→Jun'26), core CPI yoy ≈2.25%; unemployment fell to 4.1% (Jul'26) from 4.5% (Nov'25); 10y breakeven ≈2.25% (stable). No data source indicates a 50bp cut is live; dot plot and dissent pattern point toward a hike as the more plausible non-hold outcome. 6. **Dot plot/guidance & leadership** — June 2026 dot plot: median year-end 2026 = 3.8% (implies one hike), 3 members see +25bp, 5 see +50bp cumulative by year-end; Warsh (new chair, took office May 2026) has scrapped explicit forward guidance and called internal debate a "family fight" (used 13x); three regional presidents (Hammack, Kashkari, Logan) dissented hawkishly in July. 7. **Historical base rate for divergent sequences** — No empirical historical base rate was retrieved; only a synthetic/illustrative simulation (code_execution, NOT real market data) shows: under independence, P(differ)=83%; under moderate persistence (p=0.5), P(differ)=51%; under strong persistence (p=0.7), P(differ)=33%. Treat as a modeling sensitivity, not fact. # Key facts (high-confidence, factual) 1. [federalreserve.gov] Target range held at 3.50-3.75% at both June 17 (12-0) and July 29 (9-3) 2026 meetings. 2. [cnbc.com] July 29 dissent (Hammack, Kashkari, Logan) was the first 3-way unified hawkish dissent since Sept 2016. 3. [FRED DFEDTARU] Current upper bound = 3.75% as of Aug 2026. 4. [FRED UNRATE] Unemployment 4.1% (Jul 2026), declining from 4.5% (Nov 2025). 5. [brookings.edu] Kevin Warsh confirmed Fed Chair May 13, 2026; took office May 22, 2026. 6. [advisorperspectives.com] June 2026 dot plot median for year-end 2026 = 3.8%, implying a hike. # Cross-market signals - Kalshi related: September single-meeting market (KXFEDDECISION-26SEP) ≈65% hold / 34% hike / ~1% other (per claude_news synthesis). - Polymarket: This market itself at 40% YES, trending down as Iran-driven hike odds eased. - Sportsbook implied: N/A (not applicable to Fed markets); fed-funds-futures-style tracker swung 53%→82% hike odds (late July) before retreating. # Analyst opinions and speculation - Gregory Daco (EY-Parthenon): September is the "first meaningful test" of whether inflation improvement is durable. - Governor Waller has voiced inflation concerns but voted hold in July. - Growbeansprout tracker (61.9% hike) vs. centralbank.watch (~19.9% hike) diverge sharply — high dispersion across trackers signals genuine uncertainty, not consensus. # Directional lean per outcome - **Yes (differ)**: Supported by hawkish dot plot (3.8% median), 3-way dissent trend, Warsh's rhetoric, and Kalshi's 34% hike pricing for September — a hike would break the hold-hold pattern. - **No (identical)**: Supported by Kalshi's larger 65% hold weighting, cooling oil/inflation risk after Iran de-escalation, and Fed's historical inertia (two consecutive holds already banked); Polymarket's declining trend (63%→40%) itself signals the market is now leaning toward "No." # Gaps / unknowns - No confirmed Kalshi-native ticker matching this exact composite Yes/No question; anchor relies on Polymarket + a related single-meeting Kalshi market. - No genuine historical base-rate data for 3-meeting divergence sequences was retrieved (only a synthetic simulation). - September SEP/dot plot not yet released; outcome remains genuinely open. # Calibration anchors - Polymarket current YES price: 40% (primary anchor), down from 63% peak. - Implied via Kalshi September leg: P(Sep≠hold) ≈ 35% (34% hike + ~1% other) — closely matches Polymarket's 40%, reinforcing anchor. - Synthetic simulation range (illustrative only): 33%–83% depending on persistence assumption — wide, low-confidence bound.

1. Both forecasters converge tightly (37% vs 38%) around the Polymarket/Kalshi anchors without independently stress-testing the "~1% other" residual for a cut scenario—given unemployment falling to 4.1% and no cut signal in the brief, this seems fine, but neither explicitly justifies why cut probability is negligible rather than just assumed. 2. Neither forecast grapples with the tracker dispersion noted in the brief (Growbeansprout 61.9% hike vs. centralbank.watch 19.9% hike)—this wide disagreement suggests genuine model uncertainty that could argue for a wider or more uncertain final probability than the tight 37-38% convergence implies. 3. Both treat the Polymarket 40% and Kalshi-implied 35% as mutually reinforcing, but the brief notes Polymarket peaked at 63% and is still declining (down 8.5pts over 7 days)—neither forecaster discusses whether the downtrend might continue further before September, which could argue for shading even lower than 37-38%. 4. The synthetic simulation range (33%-83% under different persistence assumptions) is dismissed by both as "illustrative only," but neither explores that even the persistence-based lower bound (33%) is very close to their point estimates, which could either validate their number or suggest they're anchoring on market prices while ignoring that persistence models and market prices happen to agree only at the low end of a wide range. 5. Neither forecaster explicitly addresses Warsh's stated departure from forward guidance ("scrapped explicit forward guidance," called debate a "family fight" 13x)—this regime change under a new hawkish chair could increase tail-risk of a surprise hike beyond what backward-looking market trackers (calibrated on Powell-era Fed) would capture, an under-weighted qualitative signal in both rationales. 6. Both forecasts nearly identically split the difference between Polymarket (40%) and Kalshi-implied (35%) without flagging that these two anchors themselves may not be independent (Polymarket traders may simply be arbitraging the Kalshi-implied September odds), potentially creating false confidence from what is really a single underlying signal counted twice.

36% (medium confidence)

Yes: 36% No: 64%

June and July 2026 are confirmed identical holds, so the market reduces entirely to whether the Sept 15-16 FOMC diverges (a hike being the only realistic non-hold path; a cut is essentially dead with unemployment at 4.1%, a 3.8% year-end dot median, and three hawkish dissents). The two best anchors — Kalshi's September meeting market (~34-35% non-hold) and Polymarket's composite (40% Yes, and still trending down) — likely reflect largely the same underlying signal, so I weight the direct September leg most heavily. Offsetting the critique's points: Warsh's regime change and the scrapped forward guidance add genuine surprise-hike tail risk, but that is balanced by the post-Iran de-escalation cooling in oil, core CPI ~2.25%, and the Fed's demonstrated inertia across two consecutive holds plus Polymarket's continuing drift lower. Tracker dispersion (19.9% vs 61.9% hike) is real model uncertainty but is symmetric noise around the ~35% market-clearing level rather than a directional signal. Final: 36.5% Yes, marginally below the Polymarket print and essentially at the Kalshi-implied September divergence probability.

Total pipeline time: 165.2s