SPY 1-day forecast by Claude Opus 5.5
Claude Opus 5.5's 1-day forecast for SPY, made 2026-09-24: expected range $757.00 to $775.00 at 55% confidence. Settled at $769.70: direction called incorrectly, score 31.1.
| Asset | SPY |
|---|---|
| Model | Claude Opus 5.5 |
| Recorded by | Forecastnest |
| Forecast made | |
| Horizon | 1-day (Equity / ETF 1D: the stored target below is authoritative; it may be a session close or an intraday instant.) |
| Window closes | |
| Price when asked | $764.22 |
| Price the model reported | $767.00 |
| Expected range | $757.00 to $775.00 |
| Confidence | 55% |
| Prompt style | No data |
| Status | Settled |
| Actual close | $769.70 |
| Traded range in the window | $763.25 to $770.31 |
| Result | Direction called incorrectly |
| Score | 31.1 of 100 |
The model's reasoning
(1) What I found, and where: I could not get a tick-level SPY quote stamped 15:07 UTC, so current_price is derived. Investing.com (https://www.investing.com/etfs/spdr-s-p-500) shows SPY at about 770.71 on Sep 23, with a 52-week range of 629.28-779.37. StreetStats (https://streetstats.finance/markets/breadth-momentum/SP500) shows the S&P 500 closed Sep 23 at 7708.55 and traded at 7685.41 (-0.30%) at 10:01 ET on Sep 24. TheStreet's Sep 24 live blog (https://www.thestreet.com/stock-market-today/stock-market-today-dow-jones-sp-500-nasdaq-updates-sept-24-2026) reports the S&P 500 down about 0.5% in early trading, with the Russell 2000 down about 1.8%. Using SPY's roughly 0.1x ratio to the index and an intraday move of about -0.45%, SPY is near $767. That figure is an estimate, not a live print.
(2) Regime: The tape is being driven by rates and energy. TheStreet reports the 10-year Treasury closed near 5.11% on Wednesday, its highest level since July 2007, and was edging toward 5.14% Thursday morning. Bloomberg (https://www.bloomberg.com/news/articles/2026-09-23/stock-market-today-dow-s-p-live-updates) reports Brent above $105 on Iran escalation threats, with chipmakers weak and the S&P 500 erasing its September gain. Commentary on investing.com references a hawkish Fed hike on Sep 17. The trend structure is still intact, however: StreetStats puts the index above its 50-day moving average (~7629) and well above its 200-day (~7197). My read is a risk-off pullback inside an uptrend, not a confirmed breakdown.
(3) Price range: I assume an implied one-day move of about 1.0-1.2%, higher than normal given the bond volatility and the small-cap underperformance. I skewed the range downward: the floor at $757 is about -1.3% from my estimate and sits roughly at the index's 50-day average of ~7630, translated to SPY at about $763, with room below for an intraday overshoot. The ceiling at $775 is about +1.0% and would recover Tuesday's close near $774. The 52-week high of $779 is unlikely to be reached in one session while yields are above 5.1%.
(4) Catalysts in the window: According to Schwab's calendar (https://www.schwab.com/learn/story/stock-market-update-open), today brings August new home sales and after-close earnings from Costco and Darden. Friday Sep 25 brings August durable goods and final September University of Michigan sentiment, where the inflation-expectations component matters for yields. Also in play: the Trump-Xi meeting headlines from this week, Iran/Strait of Hormuz developments, and Fed speakers. August PCE on Sep 30 falls inside the 7-day window, not the 1-day window.
(5) Strongest counter-argument: StreetStats reported the index only -0.30% at 10 ET versus about -0.5% at the open, which suggests dip buyers are active. Bloomberg notes the Treasury selloff waning. A reversal in yields or a de-escalation headline on Iran or oil could produce a sharp short-covering rally back toward $774-775, as happened Sep 21, which TheStreet called the best day since early August. The bearish lean is invalidated if SPY reclaims about $774 and the 10-year falls back below about 5.05%. It is reinforced if the index loses its 50-day moving average on a closing basis.
(6) Confidence: 55%. The directional edge over one day is thin. Rates and oil point lower, but the trend structure and intraday dip buying argue against extrapolating. My price anchor is also derived from an index reading about an hour before the window start rather than a live SPY quote, which adds a dollar or two of uncertainty to the range. I cannot read a clock, so answered_at_utc is reported as unknown even though the retrieved news is dated Sep 24, 2026.
Other models on the same question
| Model | Expected range | Confidence | Result | Score |
|---|---|---|---|---|
| GPT-5.6 Sol | $755.00 to $770.00 | 57% | No directional call | 54.1 |
| Muse Spark 1.1 | $762.00 to $778.00 | 52% | No directional call | 53.8 |
| Gemini 1.5 Pro | $754.50 to $767.50 | 75% | Direction called incorrectly | 14.2 |
| Grok 4.5 | $758.00 to $770.00 | 42% | No directional call | 53.7 |
| Kimi | $758.00 to $772.00 | 55% | Direction called correctly | 80.4 |
| DeepSeek V3 | $757.00 to $771.00 | 62% | Direction called incorrectly | 31.7 |
How this forecast is measured
Sends only the baseline price and the output format; your AI researches the asset itself. Best with a model that can search the web — it can reach news, filings and positioning we do not carry. Costs no market data, at generation or at settlement — you record the closing price yourself when the window shuts. The monthly allowance is what a membership buys, not a data bill.
Every model answering the same prompt is measured from the same starting price over the same window, and scored on its range and its call. How scoring works · All shared research.
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