Event Gaps: GPT-6's picks for 2026-10-23
GPT-6 picked MRNA, WDC, LRCX, SLB, ALLE for a 1-day horizon. Intraday alpha vs SPY: -2.21%. Picks with positive alpha: 0%.
| Experiment | Event Gaps |
|---|---|
| Model | GPT-6 |
| Prompt version | event-gap-v13 |
| Asked | |
| Horizon | 1-day |
| Measured from | 2026-10-23 |
| Measured to | 2026-10-26 |
| Benchmark | SPY |
| Status | Settled |
| Intraday alpha vs SPY | -2.21% |
| Picks with positive alpha | 0% |
| Benchmark return | +0.64% |
The picks
| Rank | Symbol | Gap direction | Price change | Return in the called direction | Confidence | vs benchmark | Called right |
|---|---|---|---|---|---|---|---|
| 1 | MRNA | -1.90% | -1.90% | 55% | -2.55% | No | |
| 2 | WDC | +0.02% | +0.02% | 61% | -0.62% | No | |
| 3 | LRCX | +3.78% | -3.78% | 59% | -4.42% | No | |
| 4 | SLB | -1.94% | -1.94% | 59% | -2.58% | No | |
| 5 | ALLE | -0.25% | -0.25% | 60% | -0.89% | No |
The model's market view
Ranks emphasize remaining event sensitivity, alongside directional conviction. The forecasts cover the authoritative window from 2026-10-23T15:15:27.211Z through 2026-10-26T15:15:00.000Z, rather than opening gaps or earlier event reactions. Exact request-time prices and elapsed-window returns could not be verified. Expected moves are uncertain forecasts for that full window; the remaining directional expectations are explained separately. All five pass the screening floors using retrieved prices, October 23 capitalization snapshots and calculated 20-session average dollar volume. Dollar volume is mean(daily split-adjusted Close multiplied by share volume), not trade-level turnover. Historical statistics use only the 20 completed US Eastern sessions from September 25 through October 22. Quote snapshots are stale by their disclosed timestamps, and some intraday summaries conflict. No October 23 partial bar enters completed history. Portfolio scoring remains the equal-weight mean of directional returns minus SPY's window return.
Why each pick
MRNA
Catalyst: the October 24 ESMO presentation is officially scheduled, not completed. Detailed Phase 3 results were already released October 22, including a 42% reduction in recurrence or death; source https://finance.yahoo.com/healthcare/articles/merck-moderna-present-results-landmark-185900591.html. Clinical efficacy is substantive, but approval and commercial outcomes remain uncertain. My inference is that presentation context and the subsequent investor webcast could support a 5.5% window rebound; no undisclosed favorable results are assumed. Much disappointment is already priced in, but renewed emotional selling remains a major risk.
Before disclosure, closes rose from 218.01 to 245.81; the subsequent collapse established a 20-session low. Its lower wick and today's recovery from 183.00 permit a reversal interpretation, while the weak completed close on 2.55 times average volume is the strongest counter-evidence. Invalidation: a future trade below 180.80. The remaining expectation after the latest quote is upward, excluding the rebound already observed.
latest_price=200.43 USD; quote_time=2026-10-23T11:12:00-04:00; regular-session snapshot labelled real-time, actual latency unverified; source https://stockanalysis.com/stocks/mrna/history/. This is also an available pre-presentation price; presentation_event_to_quote_pct=null because the presentation has not occurred. Pre-disclosure baseline=245.81 at 2026-10-21T16:00:00-04:00, from the history source; baseline-to-quote=-18.4614%, not an isolated leak reaction. Capitalization=80170000000 at 2026-10-23T10:53:00-04:00; source https://stockanalysis.com/stocks/mrna/statistics/.
PARTIAL SESSION as of 2026-10-23T11:12:00-04:00: open=196.69, high_so_far=203.85, low_so_far=183.00, cumulative_volume=11329330; same history source. Relative intraday volume cannot be established without a same-time baseline.
Completed daily_5d, US Eastern regular sessions, split-adjusted OHLC and Close, excluding dividend adjustments; source https://stockanalysis.com/stocks/mrna/history/:
session_date=2026-10-16, open=235.00, high=237.96, low=208.92, close=218.01, volume=21403317
session_date=2026-10-19, open=217.27, high=236.77, low=216.00, close=226.89, volume=18788924
session_date=2026-10-20, open=226.03, high=243.98, low=216.65, close=242.08, volume=16835985
session_date=2026-10-21, open=242.20, high=254.48, low=239.55, close=245.81, volume=15851298
session_date=2026-10-22, open=240.13, high=241.26, low=180.80, close=202.63, volume=49532195
close_five_sessions_earlier=236.50 on 2026-10-15; return_5d_pct=-14.3214; high_20d=254.48; low_20d=180.80; avg_volume_20d=19433389.05.
WDC
Catalyst occurred: Western Digital released earnings October 22 after the close, reporting 55% revenue growth, non-GAAP EPS of 4.64 and next-quarter EPS guidance of 5.80 at the midpoint. These improve business expectations rather than merely sentiment; source https://wdc.gcs-web.com/news-releases/news-release-details/wd-reports-fiscal-first-quarter-2027-financial-results. I forecast a 4% window advance as investors reassess pricing and margin strength, with a further rise expected after the quote. The initial reaction has not established sustained buying, so this remains a reversal thesis rather than confirmed earnings momentum.
Before earnings, three recovery sessions were followed by a downside gap and weak October 22 close. Completed volume was 1.22 times average, insufficient by itself to establish exhaustion. The 20-session range shows a substantial preceding decline. Strongest counter-evidence: the quote remains below the pre-release close despite strong guidance. Emotional continuation of AI-related selling could overwhelm the catalyst. Invalidation: a future trade below today's verified partial-session low of 339.55.
latest_price=352.47 USD; quote_time=2026-10-23T11:01:00-04:00; regular-session snapshot labelled real-time, actual latency unverified; source https://stockanalysis.com/stocks/wdc/history/. Pre-event baseline=354.19 at 2026-10-22T16:00:00-04:00, from that history; baseline-to-quote=-0.4856%. This includes intervening market effects and is not an isolated causal earnings return. Capitalization=132330000000 at 2026-10-23T10:58:00-04:00; source https://stockanalysis.com/stocks/wdc/.
PARTIAL SESSION as of 2026-10-23T11:01:00-04:00: open=346.10, high_so_far=360.66, low_so_far=339.55, cumulative_volume=6894418; history source above. Relative intraday volume cannot be established. The recovery from the partial low is already observed and excluded from the forecast opportunity.
Completed daily_5d, US Eastern regular sessions, split-adjusted OHLC and Close, excluding dividend adjustments; source https://stockanalysis.com/stocks/wdc/history/:
session_date=2026-10-16, open=347.72, high=348.51, low=331.81, close=332.00, volume=8036024
session_date=2026-10-19, open=341.96, high=356.25, low=341.14, close=352.21, volume=7813605
session_date=2026-10-20, open=348.88, high=366.00, low=342.50, close=364.32, volume=8513471
session_date=2026-10-21, open=380.25, high=381.88, low=367.13, close=378.51, volume=8421465
session_date=2026-10-22, open=363.76, high=367.34, low=348.23, close=354.19, volume=11410297
close_five_sessions_earlier=356.45 on 2026-10-15; return_5d_pct=-0.6340; high_20d=465.90; low_20d=331.81; avg_volume_20d=9373615.95.
LRCX
Catalyst occurred: October 21 earnings showed record revenue, followed by management discussion of supply and cleanroom constraints affecting shipment timing. The release is verified by the event source; management's discussion is documented at https://investor.lamresearch.com/image/LRCX-USQ_Transcript_2026-10-21.pdf. Constraints affect near-term business execution, although they do not establish weakening end demand. I forecast a 3% window decline and renewed selling after the current quote. Much initial repricing has occurred; continued liquidation is an inference, not an observed future outcome.
Before earnings, prices were already declining. The subsequent downside gap, upper wick, close near the October 22 low and 2.43 times average completed volume favor continuation. The source session also established the 20-session low. Strongest counter-evidence is today's rebound above the previous close alongside record profitability. A sharp emotional rebound could squeeze bearish positioning. Invalidation: a future regular-session close above the verified earnings-reaction high of 242.10.
latest_price=232.50 USD; quote_time=2026-10-23T10:53:00-04:00; regular-session snapshot labelled real-time, actual latency unverified; source https://stockanalysis.com/stocks/lrcx/history/. Pre-event baseline=260.81 at 2026-10-21T16:00:00-04:00, from the history; baseline-to-quote=-10.8546%, including intervening market effects rather than an isolated earnings return. Capitalization=289480000000 at 2026-10-23T10:51:00-04:00; source https://stockanalysis.com/stocks/lrcx/.
PARTIAL SESSION at 2026-10-23T10:50:55-04:00, earlier than the latest quote: open=227.41, high_so_far=232.82, low_so_far=225.14, cumulative_volume approximately 3290000; source https://www.google.com/finance/quote/LRCX:NASDAQ. A conflicting high in the history page was not used. Relative intraday volume cannot be established. The already observed morning rebound is not a future opportunity.
Completed daily_5d, US Eastern regular sessions, split-adjusted OHLC and Close, excluding dividend adjustments; source https://stockanalysis.com/stocks/lrcx/history/:
session_date=2026-10-16, open=271.44, high=275.58, low=263.14, close=263.94, volume=11356038
session_date=2026-10-19, open=275.16, high=279.92, low=271.87, close=272.20, volume=10396103
session_date=2026-10-20, open=267.76, high=270.97, low=260.29, close=263.45, volume=7796823
session_date=2026-10-21, open=270.90, high=270.90, low=259.04, close=260.81, volume=14353291
session_date=2026-10-22, open=234.50, high=242.10, low=227.68, close=230.15, volume=22813358
close_five_sessions_earlier=277.46 on 2026-10-15; return_5d_pct=-17.0511; high_20d=352.56; low_20d=227.68; avg_volume_20d=9398873.95.
SLB
Catalyst occurred: today's earnings reported revenue of 9.45 billion, up 5% sequentially, and adjusted EPS of 0.64, up 16% sequentially; source https://investorcenter.slb.com/news-releases/news-release-details/slb-announces-third-quarter-2026-results. The sequential recovery changes operating expectations. I forecast a further 2.8% window advance, supported by continued reassessment rather than counting the morning rally again. A substantial portion of the catalyst is already reflected in the quote.
The completed five-session path was uneven: recovery into October 21 was followed by a weak October 22 close, a small upper wick and a larger lower wick. That session's volume was 1.24 times average, offering no decisive bullish confirmation. Today's quote above the completed 20-session high of 52.29 supplies separate, partial-session breakout evidence. Strongest counter-evidence: adjusted EPS still declined 7% year over year, while acquisition effects explain part of reported growth. Risks include emotional buying exhaustion, oil-price reversal and renewed operational disruption. Invalidation: a future regular-session close below the verified October 21 high of 51.24.
latest_price=52.77 USD; quote_time=2026-10-23T11:09:50-04:00; regular-session snapshot, feed delay unverified; source https://www.google.com/finance/quote/SLB:NYSE. Pre-event baseline=49.55 at 2026-10-22T16:00:00-04:00; source https://stockanalysis.com/stocks/slb/history/. Baseline-to-quote=6.4985%, including sector and market influences rather than an isolated earnings effect. Capitalization=78210000000 from the Google Finance snapshot.
PARTIAL SESSION as of 2026-10-23T11:09:50-04:00: open=49.96, high_so_far=null, low_so_far=49.48, cumulative_volume approximately 5280000; Google Finance source above. The displayed high conflicts with the quote, so it cannot be verified. Relative intraday volume cannot be established.
Completed daily_5d, US Eastern regular sessions, split-adjusted OHLC and Close, excluding dividend adjustments; source https://stockanalysis.com/stocks/slb/history/:
session_date=2026-10-16, open=49.01, high=49.77, low=48.90, close=49.50, volume=12217827
session_date=2026-10-19, open=49.02, high=49.33, low=48.67, close=49.09, volume=10067894
session_date=2026-10-20, open=49.84, high=50.14, low=49.07, close=49.98, volume=11647093
session_date=2026-10-21, open=49.98, high=51.24, low=49.92, close=51.10, volume=10822744
session_date=2026-10-22, open=51.00, high=51.16, low=48.70, close=49.55, volume=14986521
close_five_sessions_earlier=48.37 on 2026-10-15; return_5d_pct=2.4395; high_20d=52.29; low_20d=47.17; avg_volume_20d=12074553.95.
ALLE
Catalyst occurred: October 22 earnings reported 7.2% organic revenue growth and raised full-year adjusted EPS guidance to 9.05–9.10. This is substantive improvement in business expectations; source https://www.allegion.com/corp/en/news/year/2026/q3-results.html. I forecast a 2% window advance and continued demand after the latest quote. Much good news is already priced in, making profit-taking and emotional momentum reversal significant risks.
Before earnings, the last two closes rose. The earnings session then gapped above prior-session prices and closed near its high with a very small upper wick on 2.02 times average volume. The new completed 20-session high supports continuation, rather than establishing exhaustion simply because the rise was large. Strongest counter-evidence is the size of the existing repricing and international organic revenue declining 0.2%. Invalidation: a future regular-session close below the verified October 22 high of 176.94, indicating failure to retain the subsequent breakout.
latest_price=178.67 USD; quote_time=2026-10-23T11:00:00-04:00; regular-session snapshot, feed delay unverified; source https://www.google.com/finance/quote/ALLE:NYSE. Pre-event baseline=159.00 at 2026-10-21T16:00:00-04:00; source https://stockanalysis.com/stocks/alle/history/. Baseline-to-quote=12.3711%, including intervening trading rather than an isolated causal earnings return. That advance is already observed and excluded from the forecast opportunity. Capitalization=15200000000 from the Google Finance snapshot.
PARTIAL SESSION as of 2026-10-23T11:00:00-04:00: open=178.85, high_so_far=179.47, low_so_far=176.02, cumulative_volume approximately 387940; Google Finance source above. Relative intraday volume cannot be established.
Completed daily_5d, US Eastern regular sessions, split-adjusted OHLC and Close, excluding dividend adjustments; source https://stockanalysis.com/stocks/alle/history/:
session_date=2026-10-16, open=155.87, high=157.99, low=154.35, close=156.54, volume=1127978
session_date=2026-10-19, open=155.53, high=156.23, low=154.65, close=155.44, volume=832493
session_date=2026-10-20, open=155.51, high=157.33, low=155.15, close=157.03, volume=1046071
session_date=2026-10-21, open=157.21, high=159.00, low=155.66, close=159.00, volume=1098902
session_date=2026-10-22, open=170.00, high=176.94, low=167.62, close=176.52, volume=2097381
close_five_sessions_earlier=155.75 on 2026-10-15; return_5d_pct=13.3355; high_20d=176.94; low_20d=142.00; avg_volume_20d=1038794.85.
Other models on the same run
| Model | Picks | Intraday alpha vs SPY | Picks with positive alpha |
|---|---|---|---|
| Claude Opus 5.5 | GGG, ALLE, CRS, DECK, MRNA | -1.40% | 20% |
| Gemini 3 Pro | CCI, TSLA, TXN, IBM, T | +1.92% | 100% |
| Grok 4.7 | AXP, SLB, VZ, BAH, META | -3.19% | 20% |
| Muse Spark 1.1 | ROP, ALLE, POOL, TTMI, CRS | +2.03% | 60% |
| DeepSeek | DECK, CCI, AMT, SKYD, NCLH | -1.56% | 20% |
Written up on ForecastNest Insights: Event Gaps: GPT-6's picks for 2026-10-23.
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