Scan: Will quarterly GDP be above 5% in any quarter in Q1 2025 to Q4 2028?

date	predicted	market price	confidence
2026-08-17	26%	26%	65%
2026-08-09	33%	37%	50%
2026-07-10	40%	50%	50%

1. Planner Opus 5

Tools chosen: kalshi_direct kalshi_related fred code_execution claude_news gdelt_news polymarket_related

Sub-questions (Fermi decomposition)

What were the realized annualized real GDP growth rates for each quarter from Q1 2025 through the most recent reported quarter, and did any exceed 5%?
How many quarters remain unreported between now and Q4 2028 (i.e., how many independent chances remain)?
What is the historical base rate of a single quarter exceeding 5% annualized real GDP growth in the US since 1990 (excluding the 2020-21 COVID rebound)?
What do current nowcasts (Atlanta Fed GDPNow, NY Fed Staff Nowcast) and consensus forecasts (FOMC SEP, Blue Chip, CBO) project for 2026-2028 GDP growth?
Are there identifiable mechanical distortions (net-export/import swings from tariffs, inventory swings, AI capex boom, government shutdown rebound) that could produce a one-off >5% print?
What is the current Kalshi price on this market and on related GDP markets, and how has it moved over the past 90 days?

Planner reasoning

This is a long-horizon 'any quarter above 5%' question resolved on BEA quarterly real GDP growth (SAAR). The key drivers are (a) how many quarters remain unresolved, (b) the historical base rate of >5% annualized quarters in the post-1990 era, and (c) near-term nowcasts/forecasts plus any distorting factors (tariff-driven import swings that inflated Q2/Q3 2025 prints). I'll anchor on the Kalshi price, pull actual GDP data from FRED, compute base rates, and check news for nowcasts.

2. Research

tool	status	time	items	summary
kalshi_direct	OK	0.2s	1	## This Market's Kalshi Data Above 5% (KXGDPUSMAX-28-5) - Current price (probability): 25.40% - 7-day price change: -0.90% - 30-day price change: -24.60% - Average daily volume: 228 contracts - Price range: 15.90% - 51.20% - Data points: 78 days
kalshi_related	OK	5.1s	3	3 related markets / summaries. series KXGDPUSMAX: 0 markets (skipped 1 no-signal) \| series KXGDP: 0 markets (skipped 36 no-signal) \| keyword 'GDP growth': ok \| keyword 'recession': ok \| keyword 'quarterly GDP': ok
fred	OK	7.0s	6	Fetched 6 FRED series (lookback=1460d) (via search 'real GDP percent change from preceding quarter annual rate').
code_execution	OK	57.8s	0	## Key Findings Historical base rates (1985Q1–2024Q4, 160 quarters, approximated from BEA-style history): - Overall: 19/160 quarters (11.9%) exceeded 5.0% annualized growth - Excluding COVID rebound (2020Q3–2021Q4, 6 quarters): 15/154 quarters (9.7%) exceeded 5.0% - **Since 2000
claude_news	OK	33.6s	14	## Key Findings Actual 2025 quarterly GDP prints (BEA): - Q1 2025: the economy grew at a 2.5% annualized rate through the first three quarters of 2025 , with Q1 itself revised to a contraction of 0.6% (later revised), due to tariff frontloading resulting in a steep increase in imports, wh
gdelt_news	OK	219.2s	0	GDELT: 0 articles across 3 queries (lookback=45d). 'GDPNow Atlanta Fed GDP estimate': error GDELT rate-limited after retries (429) \| 'US GDP annualized growth quarter BEA': error GDELT rate-limited after retries (429) \| 'GDP forecast 2026 2027': error GDELT rate-limited after retries (429)
polymarket_related	OK	5.1s	0	Scanned 100 active Polymarket markets, kept 0 matches. keyword 'GDP': 0 markets \| keyword 'recession 2026': 0 markets \| keyword 'US GDP growth': 0 markets

3. Evidence Brief Sonnet, 7611 chars

# Current state This is a resolved-progressively, multi-quarter cumulative market: it resolves YES if ANY single quarter from Q1 2025–Q4 2028 prints >5.0% annualized real GDP growth (BEA measure). As of the latest data, 6 of 16 quarters have been reported (2025Q1–2026Q2), none exceeded 5%; the closest was Q3 2025 at 4.4%. Ten quarters remain unreported, giving the market multiple future "shots" before it can resolve NO by expiration. # Timeline of key events - 2025-01-01 to 2025-03-31 (Q1 2025): GDP contracted -0.6% annualized, driven by tariff-frontloaded import surge. Confirmed (BEA/Fox Business). - 2025-04-01 to 2025-06-30 (Q2 2025): Final estimate revised up to 3.8% (from earlier 3.3%), largely a "mirage" from a sharp import decline post-tariff frontloading. Confirmed (BEA). - 2025-07-01 to 2025-09-30 (Q3 2025): Updated estimate 4.4% — highest print of the period so far, still below 5%; flagged as data-quality-impacted due to shutdown-delayed collection. Confirmed (BEA). - 2025-10-01 to 2025-12-31 (Q4 2025): Third estimate 0.5%, government shutdown subtracted ~1.0pp via reduced federal services. Confirmed (BEA). - 2026-01-01 to 2026-03-31 (Q1 2026): 2.1% (revised up from 1.6%). Confirmed (Trading Economics/BEA). - 2026-04-01 to 2026-06-30 (Q2 2026): 1.5%, below Q1 and forecasts. Confirmed (Trading Economics). - ~2026-07 (Q3 2026, in progress): Atlanta Fed GDPNow nowcast at 4.03% (2026-07-01 vintage) — an early, volatile nowcast, not a final estimate. Reported/preliminary (FRED GDPNOW series). - Kalshi price fell from ~50%+ range down to 25.4% over the past 30 days (-24.6%), reflecting repeated sub-5% prints reducing perceived odds. Confirmed (Kalshi direct). # Event Will any quarter from Q1 2025 through Q4 2028 show real GDP growth (annualized) above 5%? # Outcomes to forecast - Yes (at least one qualifying quarter >5%) - No (no quarter exceeds 5% through Q4 2028) # Kalshi market anchor **YES currently priced at 25.40%.** 7-day change: -0.90%; 30-day change: -24.60% (large decline). Price range over 78 days: 15.90%–51.20%. Average daily volume ~228 contracts (moderate liquidity). The steep 30-day drop coincides with reported Q4 2025 (0.5%) and Q2 2026 (1.5%) misses, and reflects the market repricing downward as easy quarters pass without a >5% print. # Sub-question answers 1. **Realized quarterly growth 2025Q1–latest**: Q1 2025: -0.6%; Q2 2025: 3.8%; Q3 2025: 4.4% (highest, near-miss); Q4 2025: 0.5%; Q1 2026: 2.1%; Q2 2026: 1.5%. None exceeded 5%. [BEA/FRED/claude_news] 2. **Quarters remaining**: 6 of 16 quarters (2025Q1–2026Q2) reported; 10 quarters remain unreported (2026Q3–2028Q4), each an independent "shot" at a >5% print. [derived from FRED data] 3. **Historical base rate**: Since 1985, ~11.9% of quarters exceeded 5%; excluding COVID rebound, ~9.7%; since 2000, ~8.0%; since 2010 (post-GFC "new normal"), ~8.3%. [code_execution] 4. **Forecasts for 2026-2028**: Fed SEP (June 2026): 2.4% (2026), 2.3% (2027), 2.1% (2028) — annual, not quarterly, and well below 5% threshold. Philly Fed SPF: ~1.8-1.9% expected 2025-2026, with probability mass concentrated in 1.5-2.4% range. No consensus source projects a >5% quarter. [claude_news/Philadelphia Fed] 5. **Mechanical distortions**: Yes — tariff-driven import/export timing swings (Q1 2025 drag, Q2 2025 boost) and government-shutdown effects (Q4 2025 drag) have caused outsized, non-fundamental quarterly swings of 3-5pp magnitude, raising tail risk of a future one-off >5% print from similar trade-timing or fiscal reversal effects, even with modest underlying trend growth (~2%). [claude_news] 6. **Kalshi pricing**: Current YES = 25.40%, down sharply (-24.6%) over 30 days. Related Kalshi recession-2027 market at 25% (down 14% in 30 days), suggesting broadly softening growth/recession expectations market-wide. [kalshi_direct/kalshi_related] # Key facts (high-confidence, factual) 1. [BEA/FRED] No quarter from 2025Q1–2026Q2 has exceeded 5%; peak was 4.4% (Q3 2025). 2. [FRED GDPNOW] GDPNow nowcast for Q3 2026 (vintage 2026-07-01) stood at 4.03%, an early/volatile signal, not final data. 3. [code_execution] Base-rate models (independence, ~8-12% per-quarter probability) suggest 50-80% cumulative probability of ≥1 quarter >5% across 8-16 quarter windows, but this uses pre-market-conditioning historical rates, not updated for realized misses. 4. [Kalshi] Market has already priced down to 25.4% reflecting 6 failed quarters out of 16, implying market believes remaining 10 quarters have materially reduced chance (~consistent with independent per-quarter probability near 2.5-3% if using naive complement math, though correlated regime effects likely apply). # Cross-market signals - Kalshi related: Recession-2027 market at 25% (down from ~39%, -14% in 30 days) — signals softening but still material recession risk, which would suppress >5% quarters. GDP-2036 annual growth bucket markets show very low probability (5%) on 2.6-3.0% growth, suggesting long-run market expects sub-3% trend. - Polymarket: No relevant active markets found. - Sportsbook implied: N/A (not applicable to macro data market). # Analyst opinions and speculation - EY-Parthenon (Daco): 2025 quarterly swings (both up and down) were largely "mirages" from tariff-driven trade timing, not real strength — implies any future >5% print is more likely mechanical/transitory than a signal of genuine acceleration. [claude_news] - RealClearMarkets: Q3 2025's 4.4% print itself was flagged as being affected by shutdown-related data-collection delays and methodology combining first/second estimates — raising both upside and downside revision risk for that print and analogous future ones. [claude_news] # Directional lean per outcome - **Yes**: Supported by demonstrated 3-5pp quarter-to-quarter volatility from tariff/trade and fiscal-shutdown effects (mechanism exists for surprise spikes); 10 quarters remain, each a fresh chance; historical base rates (8-12%/quarter) still imply meaningful cumulative probability. Opposed by consensus forecasts (Fed SEP, SPF) universally projecting sub-2.5% annual growth with no >5% quarterly outlier baked in, and by 6 consecutive quarters already falling short (closest 4.4%). - **No**: Supported by Kalshi's sharp downward repricing (51%→25% over ~78 days) reflecting realized misses; low modern-era base rates (8-10% since 2000); and Fed/SPF consensus trend growth far below 5%. Opposed by the possibility of another tariff-reversal or trade-timing shock, and by an early-stage GDPNow nowcast (4.03%) for Q3 2026 showing at least one upcoming quarter flirting with the threshold. # Gaps / unknowns - No confirmed final print yet for Q3 2026 or beyond (GDPNow is only a preliminary nowcast, historically volatile and often revised down substantially by final estimate). - Uncertain how tariff policy, trade deals, or further government shutdowns will evolve through 2028, which could reintroduce distortion-driven spikes. - No Polymarket or additional cross-market corroboration was available. # Calibration anchors - Kalshi current YES price: **25.40%** (primary anchor), down from ~50% two months prior — anchor forecast near this level unless materially new information (e.g., confirmed high Q3 2026 print) emerges. - Historical precedent: single-quarter >5% prints occur roughly 8-12% of the time in modern eras (2000-present), but 2025-2026 has already shown unusually high quarter-to-quarter volatility (tariff/shutdown effects) relative to that base rate, partially justifying a somewhat higher-than-base-rate cumulative estimate despite the Kalshi price decline.

4. Forecasters Opus 5 + GPT-5.5, in parallel

claude-opus-5

55% conf

Yes	28%
No	72%

Six of sixteen quarters are already reported with none above 5% (peak 4.4% in Q3 2025), leaving ten shots but with consensus forecasts (Fed SEP 2.1-2.4%, SPF ~1.8-1.9%) implying trend growth far below the threshold. Naive independence with an 8-12% modern base rate would imply 55-70% cumulative, but conditioning on a ~2% trend regime and softening growth/recession signals (Kalshi recession-2027 at 25%) cuts the per-quarter odds to roughly 3-5%, implying ~30-40%. Offsetting upside: unusual tariff/trade-timing and shutdown-driven 3-5pp swings have already produced near-misses, and GDPNow's early 4.03% Q3 2026 nowcast shows the threshold is at least reachable, plus BEA revisions could lift a borderline print. Kalshi's YES at 25.4% (down from ~51%) is the primary anchor; I nudge slightly above it to 28% to reflect residual distortion-driven tail risk and revision channels the sharp repricing may be overshooting.

gpt-5.5

60% conf

Yes	28%
No	72%

The Kalshi anchor is 25.40% YES, and the strongest direct evidence for staying near it is that 6 of 16 quarters have already reported with no >5% print, including a near-miss at 4.4% and recent weak 0.5%, 2.1%, and 1.5% quarters. The 10 remaining quarters still point toward some YES risk because historical modern-era base rates of roughly 8-12% per quarter and observed tariff/shutdown distortions show a plausible mechanism for a one-off spike above 5%. Consensus macro forecasts from the Fed SEP and SPF point toward No because expected annual growth is only around 2%, far below the threshold, and no mainstream forecast embeds a >5% quarterly outlier. I move modestly above Kalshi to 28% because GDPNow for Q3 2026 is already around 4.0% and mechanical trade/fiscal swings have recently produced large quarterly volatility, but not far above because the market has likely priced much of that tail risk.

5. Devil's Advocate Sonnet

Both forecasts converge suspiciously to identical 0.280/0.720 outputs despite ostensibly independent reasoning chains, and both anchor almost mechanically to the Kalshi 25.4% price with only a small nudge — neither explores why the "correct" nudge should be exactly +2.6pp rather than, say, +5-10pp given the explicitly acknowledged mechanism (3-5pp tariff/shutdown swings) for tail spikes.

Neither forecaster grapples with the compounding math properly: with 10 quarters remaining and even a conservative 5%/quarter probability, independent-quarter cumulative probability is ~40%, and the brief itself notes naive base rates imply 50-80% cumulative — both forecasts assert a "conditioning down to 3-5%" without justifying why the true per-quarter rate should be lower than even the post-2010 base rate of 8.3%, especially since 2025 already exhibited two quarters near or above that historical base rate’s magnitude (4.4% and 3.8%).

Both treat the GDPNow 4.03% Q3 2026 nowcast as a minor "upside offset" but underweight that this is a live, near-term, already-elevated signal for the very next unreported quarter — a nontrivial near-term data point that arguably deserves more weight than a generic future-quarter base rate, especially since historical GDPNow-to-final gaps aren't quantified in the brief for calibration.

Neither addresses potential resolution ambiguity or measurement risk: Q3 2025's 4.4% print was "flagged as data-quality-impacted" and "affected by shutdown-related data-collection delays" with mention of "both upside and downside revision risk" — meaning a past quarter could still be revised above 5% retroactively, a scenario neither forecast explicitly prices in as a distinct YES pathway.

Both forecasts ignore the cross-market inconsistency: the recession-2027 market at 25% implies material recession risk over the horizon, which mechanically also raises tail-volatility risk (recessions are often followed by sharp snapback quarters, as seen historically), yet neither forecast connects recession risk to increased (not just decreased) probability of a subsequent high-growth rebound quarter within the 2025-2028 window.

Neither forecast substantively discusses the four-year horizon length (16 quarters through 2028) relative to potential policy regime changes (new fiscal stimulus, further tariff escalations/reversals, elections in 2026/2028 cycle effects) that could introduce fresh distortion mechanisms beyond the already-observed 2025-2026 tariff/shutdown effects, understating long-horizon tail uncertainty.

6. Aggregator Opus 5

30% (57% confidence)

Yes: 30% No: 70%

Six of sixteen quarters are reported with no >5% print (peak 4.4%), and consensus forecasts (Fed SEP ~2.1-2.4%, SPF ~1.8-1.9%) embed nothing close to the threshold, which is why Kalshi has repriced from ~51% to 25.4%. However, the critique is right that both forecasters mechanically hugged the market: ten independent shots remain, and even a conservative 4-6% per-quarter probability implies ~35-45% cumulative, while the observed 3-5pp tariff/shutdown-driven swings (already producing 3.8% and 4.4% prints in this very window) plus GDPNow's early 4.03% for Q3 2026 show the mechanism is live. Additional under-priced YES pathways include upward BEA annual revisions to a borderline past quarter (Q3 2025 was flagged as data-quality impaired) and the recession-then-snapback channel implied by the 25% recession-2027 market, since post-recession rebound quarters historically print above 5%. Against this, the market has already absorbed six misses and thin liquidity (~228 contracts/day) argues against assuming large mispricing. I settle at 30% YES — modestly above the 25.4% anchor and slightly above both forecasters, reflecting tail mechanisms and long-horizon policy-regime uncertainty without abandoning the market's core signal.

Pipeline Timing

Total pipeline time: 314.8s

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