Scan: Will the upper bound of the target federal funds rate be ≥ 4.5% at the end of 2026?

date	predicted	market price	confidence
2026-09-01	8%	8%	73%

1. Planner Fable 5.1 · Fermi decomposition + tool plan

Tools chosen: polymarket_direct kalshi_related polymarket_related fred article_search claude_news code_execution

Sub-questions (Fermi decomposition)

What is the current federal funds target range upper bound as of the latest FOMC meeting, and how many 25bp hikes would be needed to reach ≥4.5%?
What probability do fed funds futures / SOFR futures and the FOMC's latest Summary of Economic Projections dot plot assign to the policy rate being at or above 4.5% at end-2026, and how many participants project any hikes in 2026?
What are the current trends in core PCE/CPI inflation, breakeven inflation expectations, and unemployment, and are there signs of a re-acceleration that would force hikes?
Who will chair the Fed after Powell's term ends in May 2026, and does the likely successor lean dovish or hawkish relative to the current committee?
Historically, how often has the Fed reversed from a cutting cycle to raising rates by 75bp+ within roughly 12 months, absent a recession-recovery shock?
What do Kalshi's KXFED end-of-2026 rate markets and other Polymarket Fed markets imply about the probability mass above 4.25%, and do the two venues disagree?

Planner reasoning

The Fed had been cutting through late 2025, so an upper bound ≥4.5% at end-2026 requires the FOMC to reverse course and hike materially — a tail scenario driven by an inflation resurgence (tariffs, fiscal, oil) or a hawkish leadership shift. The key inputs are the current target range, futures-implied path, the FOMC dot plot, inflation/labor data, and any regime-change risk around the new Fed chair in May 2026. Cross-venue pricing on Kalshi's KXFED markets provides an independent anchor.

2. Research Parallel tool calls

tool	status	time	items	summary
polymarket_direct	OK	0.7s	1	## This Market's Polymarket Data Will the upper bound of the target federal funds rate be ≥ 4.5% at the end of 2026? - Current price (probability): 18.70% - 7-day price change: +13.55% - 30-day price change: +13.40% - Total volume: $2,411,491 (USD notional) - Price range: 2.75% - 18.70% - Data
kalshi_related	OK	3.0s	2	2 related markets / summaries. series KXFED: 0 markets (skipped 87 no-signal) \| series KXFEDDECISION: 0 markets (skipped 60 no-signal) \| series KXCBDECISION: 0 markets (skipped 0 no-signal) \| keyword 'fed funds rate 2026': ok \| keyword 'fed rate December 2026': ok
polymarket_related	OK	0.1s	0	Scanned 100 active Polymarket markets, kept 0 matches. keyword 'fed rate 2026': 0 markets \| keyword 'fed hike': 0 markets \| keyword 'Fed decision December 2026': 0 markets \| keyword 'Fed chair': 0 markets
fred	OK	5.0s	6	Fetched 6 FRED series (lookback=400d).
article_search	OK	3.4s	27	Fetched 27 unique articles across 4 queries (lookback=45d). 'FOMC dot plot 2026 rate projections hikes': 10 articles \| 'fed funds futures pricing 2026 rate hike probability': 10 articles \| 'Fed chair nominee Powell successor 2026 monetary policy': 10 articles \| 'inflation reacceleration tariffs Fed
claude_news	OK	28.2s	17	## Key Findings - Current rate & chair: The FOMC has held the target range at 3.50%–3.75% since December 2025, most recently confirmed on July 29, 2026, the Federal Reserve left the target range for the federal funds rate unchanged at 3.50% to 3.75%, citing solid activity, job gains keeping up
code_execution	OK	42.3s	0	## Findings Historical base rate (post-cutting-cycle re-hikes, excluding ZLB/recession episodes 2007-08 & 2019-22): - Examined 3 non-ZLB cutting-cycle endpoints: 1995-96 (ended 5.25%), 1998 (ended 4.75%), 2001-03 (ended 1.00%). - Only 1 of 3 (≈33%) saw the Fed hike by ≥75bp within ~12 month

3. Evidence Brief Sonnet 5 · 6214 chars

# Current state As of mid-September 2026 the FOMC target range is 3.50%–3.75% (upper bound 3.75%), unchanged since a Dec-2025 cut and reaffirmed at the July 29, 2026 meeting. Markets are pricing a ~84% chance of a 25bp hike at the Sept 16, 2026 meeting (to 4.00%), with additional hikes priced for later in 2026 pushing the effective rate toward ~4.2% by December — implying an upper bound near 4.00%–4.25%, still one hike short of the 4.50% threshold this market asks about. # Timeline of key events - 2025-12: Fed cuts to 3.50%–3.75% range (confirmed, per FRED/DFEDTARU history). - 2026 (H1, exact date unclear): Kevin Warsh becomes Fed Chair, succeeding Powell (confirmed via claude_news; Powell's term nominally ended May 2026). - 2026-06-18: June FOMC SEP released — rates held, dot plot raised sharply; median 2026 dot 3.8% (up from 3.4% in March); 9/18 participants project a 2026 hike; most hawkish dot ~4.5% (confirmed, TradingKey). - 2026-07-29: FOMC holds range at 3.50%–3.75%, citing elevated inflation (confirmed). - 2026-08-28: Warsh's Jackson Hole speech signals hawkish tilt, deprioritizing employment mandate, warns inflation progress insufficient (confirmed, CNBC/Al Jazeera). - 2026-09-10/12: Strong August CPI (~3.3-4.2% YoY) and jobs data push CME FedWatch odds of a Sept hike from ~60% to ~70-84% (confirmed). - 2026-09-16: FOMC decision (scheduled) — 25bp hike to 3.75%–4.00% widely expected but not yet occurred as of research cutoff. - 2026-12-08/09: December FOMC meeting — resolution event for this market. # Event Will the Fed's upper bound target rate be ≥4.5% after the December 2026 FOMC meeting (or as of Dec 31, 2026 if no meeting outcome by then)? # Outcomes to forecast - Yes (upper bound ≥4.5%) - No (upper bound <4.5%) # Kalshi market anchor No direct Kalshi YES price was retrieved for this ticker in this research pass (kalshi_direct tool output absent). Kalshi-related keyword searches returned only unrelated long-dated (2034-2036) fed-funds-year contracts, not this event. **Gap: Kalshi's own price for this specific market is unknown; Polymarket (18.7% YES, rising) is the only direct market read available.** # Sub-question answers 1. **Current range & hikes needed** — Upper bound is 3.75% (as of Sept 2026, pre-Sept-16 decision); reaching ≥4.50% requires three 25bp hikes total in 2026 (Sept + two more), i.e., +75bp from the current level. [FRED DFEDTARU, claude_news] 2. **Futures/dot-plot probability** — June 2026 SEP: median dot 3.8%, only 9/18 members project any 2026 hike, most hawkish dot ~4.5%. CME FedWatch (Sept 14) prices ~84% odds of a Sept hike and ~60% for a further Dec hike; futures imply ~4.2% effective rate by December — consistent with upper bound near 4.25%, below the 4.50% bucket as the base case. [tradingkey, cnbc, streetstats] 3. **Inflation/unemployment trends** — CPI YoY ~3.3-4.2%, core PCE index rising steadily (~0.3-0.5%/mo, decelerating slightly from mid-year peak); unemployment stable/easing at 4.1%-4.4%; 10yr breakevens elevated but contained (~2.35-2.40%). Energy shocks (Iran conflict, oil >$100), tariffs, and AI-driven data-center demand cited as reacceleration risks. [FRED, CNN, CNBC] 4. **Fed Chair** — Kevin Warsh succeeded Powell in 2026 and has proven more hawkish than markets expected despite Trump's push for lower rates; his Jackson Hole speech (Aug 28) emphasized fighting inflation over supporting employment. [CNBC, intellectia.ai] 5. **Historical base rate** — Of 3 non-recession/non-ZLB cutting-cycle endpoints (1995-96, 1998, 2001-03), only 1 (1998→99) saw a ≥75bp hike within ~12 months (~33% base rate); the others took 14+ months to 2 years. [code_execution] 6. **Kalshi vs Polymarket** — No comparable Kalshi contract for this exact market was found; Polymarket prices this outcome at 18.7% and rising fast (+13.4pp in 30 days), well above statistical/base-rate estimates (~9-20%), suggesting Polymarket may be pricing in recent hawkish news faster than models. [polymarket_direct, code_execution] # Key facts (high-confidence, factual) 1. [FRED] Target range 3.50-3.75% (upper bound 3.75%) held since Dec 2025 through Sept 2026. 2. [claude_news/CNBC] Kevin Warsh is Fed Chair in 2026, more hawkish than expected. 3. [tradingkey] June SEP: median dot 3.8%, 9/18 back a 2026 hike. 4. [CNBC/CME FedWatch] ~84% market-implied probability of a 25bp hike at Sept 16, 2026 meeting. 5. [FRED] Unemployment 4.1% (Aug 2026), down from 4.5% (Nov 2025). 6. [Polymarket] YES price 18.7%, up sharply over 7d/30d. # Cross-market signals - Kalshi related: no direct match found for this contract; unrelated long-dated fed-funds-year markets show no clear read-through. - Polymarket: 18.7% YES, +13.55% (7d), +13.40% (30d), $2.4M volume — strong recent momentum toward Yes. - Sportsbook implied: N/A. # Analyst opinions and speculation - Capital Economics: door open to earlier-than-Dec hike if data stays firm. - LPL Financial (Roach): inflation pressures "increasingly entrenched" amid Iran conflict/oil prices. - Consensus (Kiplinger/CME): base case is Sept hike + one more by Dec, landing near 4.00-4.25%, not 4.50%. # Directional lean per outcome - **Yes (≥4.5%)**: Supported by hawkish Chair Warsh, entrenched inflation, oil/tariff shocks, rising Polymarket price. Opposed by SEP median (3.8%), majority of dots below 4.5%, base-case futures path (~4.00-4.25%), historical base rate (~33% for 75bp+ reversals) requiring an additional hike beyond consensus. - **No (<4.5%)**: Supported by median dot, most economists' year-end forecasts (~4.00-4.25%), and statistical/base-rate models (~9-20%). Risk: any further inflation surprise could push to a third hike. # Gaps / unknowns - No direct Kalshi YES price for this exact contract was retrieved. - No September 2026 SEP (post Sept-16 meeting) data available — June SEP may be stale given hawkish shift. - Outcome of the Sept 16, 2026 FOMC decision not yet confirmed in data provided. # Calibration anchors - Polymarket YES: 18.7% (rising). - Statistical/base-rate models: ~9-20%, with historical post-cut re-hike precedent (1998-99) at ~33%. - Consensus futures path implies upper bound ~4.00-4.25% by Dec 2026 — one hike short of the 4.50% Yes threshold.

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

claude-fable-5-1

48% conf

Yes	20%
No	80%

The upper bound sits at 3.75% with three FOMC meetings left (Sept 16, late Oct, Dec 8-9), so reaching 4.50% requires a 25bp hike at every remaining meeting or a 50bp move — a pace inconsistent with the June SEP median of 3.8% and the futures-implied ~4.2% effective rate by December (upper bound ~4.25%). CME FedWatch prices ~84% for a Sept hike and ~60% for a further Dec hike, but a third hike is not the base case even after the hawkish Warsh Jackson Hole speech and hot August CPI. No Kalshi price was retrieved; Polymarket at 18.7% and rising fast is the only direct market read, and the historical base rate for ≥75bp reversals within a year (~33%) plus entrenched-inflation/oil-shock risk argue against going much below it. I land near 20% Yes, slightly above Polymarket to respect the momentum in hawkish repricing and the stale June dot plot.

gpt-5.6-sol

67% conf

Yes	19%
No	81%

Reaching 4.50% requires three 25bp hikes from the current 3.75% upper bound, while futures imply a year-end upper bound around 4.25%, one hike short. The June median dot of 3.8% and economists’ base case of a September hike plus at most one additional hike point toward No, although strong inflation, low unemployment, and Chair Warsh’s hawkish stance create meaningful upside risk. Historical evidence also suggests such a rapid 75bp reversal is uncommon. With no direct Kalshi price available, I anchor near Polymarket’s 18.7% YES price and assign 19% to Yes.

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

Both forecasters anchor almost entirely on Polymarket's 18.7% without questioning whether Polymarket's rapid +13pp momentum already reflects information (like Sept 16 outcome) that the SEP/futures data hasn't caught up to—yet the brief flags the June SEP as possibly "stale," and neither forecast adjusts for the unresolved Sept 16 decision, which could immediately validate or kill the "one hike short" thesis.

Neither forecast meaningfully grapples with the mismatch between the June dot plot (median 3.8%, only 9/18 favoring any hike) and the much more hawkish tone from Warsh's Jackson Hole speech and 84% Sept-hike pricing—this gap suggests the dot plot may be badly outdated, but both still treat it as a strong anchor for the "No" case rather than downweighting it.

The 3-meeting math (Sept, Oct, Dec) assumes standard 25bp increments only; neither forecaster explicitly addresses the tail scenario of a 50bp hike (raised by Capital Economics' comment on "earlier-than-Dec" moves) or an oil-shock-driven acceleration, which could reach 4.50% via fewer meetings.

Both forecasts land at nearly identical probabilities (20% and 19%) with different confidence levels (0.48 vs 0.67) but neither justifies why their confidence differs so much given they used essentially the same evidence and reasoning path — this convergence without independent reasoning reduces the diagnostic value of having two forecasters.

Neither critique addresses the asymmetry in the historical base-rate evidence: the 1998-99 episode (33% hit rate) is a single data point from a very different macro regime (no tariff shocks, no AI-driven demand surge, no comparable inflation dynamics), so leaning on it to nudge above Polymarket's 18.7% may be a reference-class error given how unusual 2026's combination of hawkish leadership + tariffs + energy shocks is.

Both forecasts ignore the missing Kalshi YES price gap without discussing implications—since this is explicitly a Kalshi market and the brief states no Kalshi price was found, forecasters should flag more prominently that their anchor (Polymarket) may diverge from actual Kalshi pricing dynamics, especially given Kalshi's typically different retail-trader base and liquidity profile.

6. Aggregator Fable 5.1 · final calibrated forecast

20% (57% confidence)

Yes: 20% No: 80%

Reaching a 4.50% upper bound from 3.75% requires 25bp hikes at all three remaining 2026 meetings (Sept, Oct, Dec) or a 50bp move, while futures imply a year-end upper bound around 4.25% — one hike short — and the joint probability of consecutive hikes implied by FedWatch (~84% Sept, ~60% Dec, Oct uncertain) lands in the mid-to-high teens. Polymarket's 18.7% YES (rising quickly) is the only direct market read and is consistent with that math; the critique correctly notes the June SEP is stale and that Warsh/oil/tariff dynamics create upside risk, but these are largely already reflected in the rapid Polymarket repricing rather than new information beyond it. The 50bp tail and a possible hawkish September SEP justify sitting slightly above Polymarket rather than below, but not a large deviation given no Kalshi price and a consensus path that stops at 4.25%. Final call: 20% Yes.

Pipeline Timing

Total pipeline time: 160.0s

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