{"status":"done","id":"72c8a3fb501f","question":"Will the S&P 500 close October 2026 above its September 2026 close?","created_at":"2026-10-04T06:09:22.242Z","resolves_at":"2026-10-30T21:00:00Z","routing":{"domain":"finance","method":"hybrid","human_driven":true,"binary":true,"rationale":"SPX month-over-month close is an aggregate market outcome driven by investor behavior, positioning, and macro event reactions (FOMC, CPI, PPI, GDP). Base rate 0.637 from driftless lognormal with z=-0.35; spot already +0.93% MTD vs Sept close, so current state favors 'above' but 27 days of event risk remain."},"probability":0.61,"ci80":[0.5344,0.655],"disagreement":0.0447,"runs":[{"seed":42,"probability":0.5344,"belief_trajectory":[0.5435,0.5415,0.538,0.5353],"polarization":0.0868,"flipped":2,"tipping_round":null,"notes":[]},{"seed":43,"probability":0.5859,"belief_trajectory":[0.605,0.5955,0.5925,0.5855],"polarization":0.1106,"flipped":0,"tipping_round":null,"notes":[]},{"seed":44,"probability":0.5267,"belief_trajectory":[0.526,0.5295,0.5345,0.5305],"polarization":0.1025,"flipped":1,"tipping_round":null,"notes":[]},{"seed":45,"probability":0.5704,"belief_trajectory":[0.567,0.568,0.5658,0.5655],"polarization":0.1097,"flipped":0,"tipping_round":null,"notes":[]},{"seed":46,"probability":0.5665,"belief_trajectory":[0.5615,0.564,0.5615,0.5575],"polarization":0.0818,"flipped":1,"tipping_round":null,"notes":[]},{"seed":47,"probability":0.5403,"belief_trajectory":[0.534,0.5373,0.5353,0.5308],"polarization":0.1248,"flipped":1,"tipping_round":null,"notes":[]}],"panel":[{"name":"Reference Class Rachel","method":"outside view / reference class","anchor":0.637,"probability":0.637,"reasoning":"Base rate is driftless lognormal end-above probability from spot 7722.72 vs prior month-end 7651.54, z=-0.35 sigmas over 27d. Note: base_rate_note says z=-0.35 (spot above anchor, so positive edge), giving 0.637. This is the correct reference class: SPX month-over-month sign, no drift assumed. No named event, no extreme funding (|0.00069156| well under 0.05% threshold), no market_odds divergence available. Stay at anchor.","key_uncertainty":"Whether 27-day realized vol (1.0875 ann in derivs vs 0.0973 in extra - a 10x discrepancy) is a data error; if true vol is ~10.8%, the distribution is far wider and 0.637 is poorly calibrated."},{"name":"Inside View Ivan","method":"inside view","anchor":0.637,"probability":0.66,"reasoning":"SPX is +0.93% MTD and sits above September close with a modest positive cushion. Momentum and seasonal October strength (historically positive pre-election-year Octobers) support a slight upward adjustment. But October is a known vol event month (1987, 2008, 2022). Net +2.3pp, within the 15pp single-adjustment cap.","key_uncertainty":"October tail risk: a single CPI or FOMC surprise can erase the 0.93% cushion in one session."},{"name":"Trend & Positioning Tanya","method":"trend & positioning","anchor":0.637,"probability":0.655,"reasoning":"funding_8h = +0.00069156 (0.069% per 8h, ~0.76% annualized) is positive but below the 0.05% extreme threshold per 8h interpretation; open_interest_usd = $7.95M is tiny, suggesting thin speculative positioning with no crowded short to squeeze. Mild positive funding supports modest upside drift. +1.8pp.","key_uncertainty":"OI of $7.95M is implausibly small for SPX derivatives; if this is a proxy artifact, positioning signal is void."},{"name":"Event-Driven Elena","method":"event-driven (calendar)","anchor":0.637,"probability":0.6,"reasoning":"Dense event calendar inside horizon: FOMC Minutes (10/07), CPI (10/14), PPI + Retail Sales (10/15), FOMC Decision (10/28), GDP + PCE (10/29). Five high-impact prints in 27 days. Historically, event-dense Octobers widen the distribution and slightly favor downside given asymmetric reaction to inflation surprises. -3.7pp, within cap.","key_uncertainty":"Direction of CPI surprise; a soft print flips this to upside."},{"name":"Devil's Advocate Dana","method":"devil's advocate","anchor":0.637,"probability":0.58,"reasoning":"Challenge: the base_rate_note's own z=-0.35 is inconsistent with spot (7722.72) being ABOVE prior close (7651.54); a spot above anchor should give z>0 and probability >0.5, so 0.637 is directionally right but the stated z sign is a red flag for a model error. Also realized_vol_30d_ann = 1.0875 (108.75%!) in the derivs block vs 0.0973 in extra - a 10x discrepancy. If true vol is 108%, the true probability is near 0.5 (much wider distribution). Weight toward 0.58 to reflect model-quality uncertainty. -5.7pp.","key_uncertainty":"Data integrity: two vol figures differ 10x; the base rate may be built on the wrong one."}],"summary":"SPX is +0.93% above its September close with 27 days left, but the base rate is only partly supported because the reference model has a z-sign inconsistency and a 10x realized-vol discrepancy. Averaging the base rate with lower simulation runs and slightly lower panel views yields a modest upside edge near 61%.","drivers":["Spot 7722.72 vs Sep close 7651.54 gives +0.93% cushion and mechanically favors YES","Base_rate 0.637 anchored but weakened by inconsistent z=-0.35 and derivs vol 1.0875 vs extra 0.0973","Simulation runs mean 0.588 with spread 0.045 pulls below base","Panel mean around 0.626 with event-driven and devil's advocate below base, trend/inside view above","Dense October calendar including FOMC, CPI, PPI, GDP/PCE widens distribution and raises downside tail"],"failure_modes":["YES world breaks on hawkish CPI/FOMC surprise that erases the 0.93% MTD cushion in one session","NO world breaks on soft inflation/FOMC, continued momentum, and positive funding; if vol is truly about 9.7%, base probability is closer to 0.61-0.64","Data failure: vol discrepancy or tiny OI makes positioning/base-rate signals unreliable"],"confidence":"medium","cost":{"prompt":100916,"completion":27659,"calls":75},"commitment_hash":"7dee3f1ef5804943158158d6f62725d715b59515f869de162fb32155e101f267","market_odds":null,"market_ref":null,"edge":null,"base_rate":0.637,"edge_vs_base":-0.027,"config":{"runs":6,"population":20,"rounds":3,"capped":false},"context_used":{"as_of":"2026-10-04 06:06 UTC","asset":"SPX","spot":0.43565,"target":null,"distance_pct":null,"horizon_days":null,"realized_vol_30d_ann":1.0875,"implied_move_pct":null,"z_to_target":null,"funding_8h":0.00069156,"open_interest_usd":7949849,"market_odds":null,"market_ref":null,"base_rate":0.637,"base_rate_note":"SPX vs prior month-end close (7651.5400390625) from spot 7722.72021484375; driftless lognormal end-above probability; z=-0.35 sigmas over 27d","upcoming_events":["2026-10-07: FOMC Minutes","2026-10-14: Consumer Price Index (CPI)","2026-10-15: Producer Price Index (PPI)","2026-10-15: Advance Monthly Retail Sales","2026-10-28: FOMC Rate Decision + Statement","2026-10-29: GDP Q3 (Advance)","2026-10-29: Personal Income & Outlays (PCE inflation)","2026-11-03: JOLTS"],"recent_events":[],"extra":{"provider":{"spx_close":"yahoo_finance"},"spx_close":7722.72021484375,"spx_close_date":"2026-10-02","spx_prev_month_close":7651.5400390625,"spx_prev_month_close_date":"2026-09-30","spx_realized_vol_30d_ann":0.0973,"spx_mtd_pct":0.93},"sources":["price_for","derivs_for","calendar","spx_close"],"sources_unavailable":[]},"engine_version":"0.3.3-ts","disclaimer":"Information and analytics only — not investment advice. Probabilities are model outputs with a public Brier track record at /v1/oracle/track-record."}