Event Gaps: Claude Sonnet 5.5's picks for 2026-10-20
Claude Sonnet 5.5 picked COF, ISRG, NFLX, UAL, ALK for a 1-day horizon. Intraday alpha vs SPY: -1.00%. Picks with positive alpha: 40%.
| Experiment | Event Gaps |
|---|---|
| Model | Claude Sonnet 5.5 |
| Prompt version | event-gap-v13 |
| Asked | |
| Horizon | 1-day |
| Measured from | 2026-10-20 |
| Measured to | 2026-10-21 |
| Benchmark | SPY |
| Status | Settled |
| Intraday alpha vs SPY | -1.00% |
| Picks with positive alpha | 40% |
| Benchmark return | -0.16% |
The picks
| Rank | Symbol | Gap direction | Price change | Return in the called direction | Confidence | vs benchmark | Called right |
|---|---|---|---|---|---|---|---|
| 1 | COF | +4.04% | +4.04% | 56% | +4.20% | Yes | |
| 2 | ISRG | -3.04% | -3.04% | 54% | -2.88% | No | |
| 3 | NFLX | -6.96% | -6.96% | 52% | -6.81% | No | |
| 4 | UAL | +0.56% | -0.56% | 52% | -0.41% | No | |
| 5 | ALK | -0.76% | +0.76% | 50% | +0.92% | Yes |
The model's market view
All five picks report after the Oct 20 close, so the event lands inside the window and the earnings reaction should dominate. Tech and AI-spending names were under pressure premarket, and a Schwab Network headline said crude was touching 100, which matters for airlines. I lean up on Capital One, Intuitive Surgical and Netflix, where expectations look washed out or beats have been consistent. I lean down on United and Alaska, where fuel-driven guidance risk is high. Confidence is modest throughout because options imply large two-way moves.
Why each pick
COF
Thesis: Capital One reports Q3 after the close on Oct 20. The event is officially scheduled and has not occurred; the company release is set for about 4:05pm ET. Consensus adjusted EPS is roughly 5.4-5.6. Polymarket traders put a 65% chance on a beat. Q2 EPS of 5.81 beat 4.80 by about 21%, but surprises were mixed in the prior two quarters (-3.7%, -6.1%). The stock sits near the lower part of its 20-session range with a forward P/E around 9, after several price-target cuts (JPM, Barclays, TD Cowen, Morgan Stanley). A clean beat with stable credit can re-rate it; anticipation may add a small drift into the 4:05pm release. Facts: schedule, consensus, Polymarket odds, target cuts. Inference: the beat is more likely than not and the market has already discounted macro worries.
Counter-evidence: management flags inflation and energy-price macro risk, crude near 100 headlines could weigh on consumer-credit sentiment, and the multi-year beat rate is only about 50%. Price and volume: the 5-session path was choppy with no breakout, and Oct 19 volume of 3,641,749 was close to the 3,663,831 20-day average, so there is no exhaustion or squeeze signal. Invalidation: weaker-than-expected charge-off or provision commentary after release, or trade below the 189.78 20-session low.
Pre-event path: -0.65% over 5 sessions. Observed reaction: none yet; event-to-quote move is null. Expected move after the current quote: about +3% by Oct 21 14:47Z.
daily_5d (US/Eastern regular sessions; session_date,open,high,low,close,volume):
2026-10-13,201.09,202.51,194.39,198.07,4615841
2026-10-14,195.55,196.87,192.43,194.35,4199735
2026-10-15,195.86,200.22,193.00,198.86,5267821
2026-10-16,200.60,204.01,200.27,201.74,4713053
2026-10-19,201.47,201.64,199.27,199.83,3641749
return_5d_pct=-0.65 (close 199.83 vs 201.14 on 2026-10-12); high_20d=207.00; low_20d=189.78; avg_volume_20d=3663831 (sessions 2026-09-22 to 2026-10-19); history source https://stockanalysis.com/stocks/cof/history/ (split-adjusted OHLC, not dividend-adjusted).
latest_price=200.21; quote_time=2026-10-20T13:40:00Z (9:40 EDT); source https://stockanalysis.com/stocks/cof/; real-time regular-session quote per the site, freshness not independently confirmed. PARTIAL SESSION as of 13:40Z: open 199.95, high_so_far 199.95, low_so_far 198.80, cumulative_volume 111993; relative intraday volume cannot be established. avg_dollar_volume_20d_usd is approximate (mean close x mean volume).
ISRG
Thesis: Intuitive Surgical reports Q3 after the close on Oct 20. The event is scheduled (the earnings date is listed as Oct 20 and options imply about a 7.9% move) and has not occurred. Consensus is roughly 2.5-2.6 EPS on about 2.9B revenue. It beat EPS by 16-32% in each of the last four quarters. Q2 procedures grew 16% against a full-year guide of 13.5-15.5%, which sets up a plausible raise. Facts: schedule, beat history, Q2 procedure growth, the July reaction (about -12% when the full-year procedure guide was only maintained). Inference: a beat-and-raise yields a modest pop, but expectations are elevated.
Counter-evidence: the stock rose about 23.7% from 350.16 (Sep 8 close) to 433.18, so much good news is priced in. The July precedent shows a no-raise outcome can cause a double-digit drop. A tough prior-year comp, US procedure moderation and China pricing add risk. Price and volume: seven of the last eight sessions were up, closing near the 20-session high. Oct 19 volume of 2,533,626 was above the 1,943,423 average, which fits continuation but could also mark crowding. Invalidation: an unchanged or lowered procedure-growth guide, or post-release trade below 419.54.
Pre-event path: +1.30% over 5 sessions and a strong multi-week uptrend. Observed reaction: none yet; event-to-quote move is null. Expected move after the quote: about +4%.
daily_5d (US/Eastern regular sessions; session_date,open,high,low,close,volume):
2026-10-13,430.00,430.00,416.37,422.06,1728122
2026-10-14,424.81,425.50,414.65,420.24,1905653
2026-10-15,425.50,429.89,419.54,427.86,2006360
2026-10-16,428.43,434.89,425.51,426.70,2575491
2026-10-19,428.79,434.62,426.70,433.18,2533626
return_5d_pct=1.30 (close 433.18 vs 427.64 on 2026-10-12); high_20d=434.89; low_20d=389.11; avg_volume_20d=1943423 (sessions 2026-09-22 to 2026-10-19); history source https://stockanalysis.com/stocks/isrg/history/ (split-adjusted OHLC, not dividend-adjusted).
latest_price=434.13; quote_time=2026-10-20T14:45:00Z (10:45 EDT); source https://stockanalysis.com/stocks/isrg/; real-time regular-session quote per the site, freshness not independently confirmed. PARTIAL SESSION as of 14:45Z: open 433.50, high_so_far 437.00, low_so_far 432.00, cumulative_volume 451013; relative intraday volume cannot be established. avg_dollar_volume_20d_usd is approximate (mean close x mean volume).
NFLX
Thesis: Netflix reports Q3 after the close on Oct 20 (scheduled; exact release time not confirmed). Consensus EPS is about 0.82-0.84 and revenue about 12.87B, essentially in line with company guidance (EPS 0.82, revenue 12.86B). Options imply about a 9.9% move, versus an average of about 7.3% over the last four reports. Sentiment is washed out: the stock is down about 26% year to date and near its 52-week low of 65.08, with price-target cuts, about 6% layoffs, executive exits, negative press and engagement worries. Netflix beat or met estimates in 15 of 18 quarters. Facts: schedule, guidance, implied move, layoffs and exits. Inference: a low bar makes an in-line print and steady Q4 guide enough for a relief rally.
Counter-evidence: BMO and Sensor Tower data point to muted engagement, US/Canada growth is decelerating, Q4 guidance may disappoint (the July guide caused a roughly 9% drop), and Polymarket gives only a 44% chance of a beat against 0.84. Price and volume: the stock chopped between 66.54 and 73.76 with no breakdown; Oct 19 volume of 33,919,973 was slightly below the 35,060,353 average. Invalidation: Q4 revenue or margin guidance below consensus, or a break below the 65.08 52-week low.
Pre-event path: -1.08% over 5 sessions. Observed reaction: none yet; event-to-quote move is null. Expected move after the quote: about +5%.
daily_5d (US/Eastern regular sessions; session_date,open,high,low,close,volume):
2026-10-13,71.16,71.52,70.42,70.46,27786420
2026-10-14,70.77,71.26,69.37,70.57,40030878
2026-10-15,71.55,73.07,71.34,72.61,40397453
2026-10-16,69.87,71.90,69.76,70.53,44151267
2026-10-19,69.75,70.22,69.02,69.85,33919973
return_5d_pct=-1.08 (close 69.85 vs 70.61 on 2026-10-12); high_20d=73.76; low_20d=66.54; avg_volume_20d=35060353 (sessions 2026-09-22 to 2026-10-19); history source https://stockanalysis.com/stocks/nflx/history/ (split-adjusted OHLC, not dividend-adjusted).
latest_price=70.23; quote_time=2026-10-20T14:44:00Z (10:44 EDT); source https://stockanalysis.com/stocks/nflx/; real-time regular-session quote per the site, freshness not independently confirmed. PARTIAL SESSION as of 14:44Z: open 69.84, high_so_far 70.66, low_so_far 69.50, cumulative_volume 8384341; relative intraday volume cannot be established. avg_dollar_volume_20d_usd is approximate (mean close x mean volume).
UAL
Thesis: United reports Q3 after the close on Oct 20 (scheduled; the call is Oct 21 at 10:30am ET, inside the window). Q3 guidance was EPS 2.50-3.50 and consensus has drifted down, with Zacks showing a cut of about 18% over 60 days to roughly 2.7-2.8. Polymarket gives only a 32% chance of a beat against 2.84. United now bases guidance on current fuel prices, and a Schwab Network headline noted crude touching 100 (a headline, not a verified price). That raises the risk that Q4 guidance falls below the roughly 3.7-3.9 consensus. The stock closed higher after only about 5 of its last 12 reports, with recent moves of -5.6% in April and -1.8% in July. Facts: schedule, guidance range, estimate cuts, Polymarket odds. Inference: fuel-driven guidance risk skews the reaction negative.
Counter-evidence: the stock is down more than 20% since mid-August, 23 of 25 analysts rate it Buy with an average target near 152, United beat or met 16 of 18 quarters, and the consensus has already been cut. The stock also rose 2.6% today, which could signal a short squeeze. Price and volume: it closed at a 20-session low of 95.60 after a -5.14% drop on Oct 16, and Oct 19 volume of 4,097,518 was slightly below the 4,445,102 average, so volume does not confirm capitulation. Invalidation: Q4 EPS guidance at or above consensus with firm fuel-recovery commentary, or a move above 101.31 (Oct 15 close).
Pre-event path: -8.46% over 5 sessions. Observed reaction: none yet; event-to-quote move is null. Expected move after the quote: about -4%.
daily_5d (US/Eastern regular sessions; session_date,open,high,low,close,volume):
2026-10-13,104.21,104.91,101.77,103.23,5037001
2026-10-14,101.10,101.91,97.70,98.96,5424488
2026-10-15,98.96,101.63,98.13,101.31,3844214
2026-10-16,101.34,102.75,96.07,96.10,4926960
2026-10-19,97.57,98.13,95.27,95.60,4097518
return_5d_pct=-8.46 (close 95.60 vs 104.44 on 2026-10-12); high_20d=118.26; low_20d=95.27; avg_volume_20d=4445102 (sessions 2026-09-22 to 2026-10-19); history source https://stockanalysis.com/stocks/ual/history/ (split-adjusted OHLC, not dividend-adjusted).
latest_price=98.10; quote_time=2026-10-20T14:08:00Z (10:08 EDT); source https://stockanalysis.com/stocks/ual/; real-time regular-session quote per the site, freshness not independently confirmed and about 40 minutes older than the other quotes. PARTIAL SESSION as of 14:08Z: open 95.01, cumulative_volume 612983; the listed day's range of 94.54-96.61 lags the 98.10 last price, so high_so_far and low_so_far are null; relative intraday volume cannot be established. avg_dollar_volume_20d_usd is approximate (mean close x mean volume).
ALK
Thesis: Alaska Air Group reports Q3 after the close on Oct 20 (company-scheduled; the call is Oct 21 at 11:30am ET, after the window ends at 10:47am ET). Q3 EPS guidance was 0 to 1.00, well below the 1.22 consensus at the time, and consensus is now about 0.37-0.59. Options imply about a 13.2% move. Fuel and capacity costs remain the swing factor, and a Schwab Network headline noted crude touching 100 (a headline, not a verified price). Analysts have cut targets (UBS to 51, BofA to 50, TD Cowen to 44), and Q4 consensus is only about 0.55. Facts: schedule, guidance, estimate cuts, target cuts, large volume on Oct 19. Inference: Q4 guidance at current fuel prices is more likely to disappoint than surprise.
Counter-evidence: the stock is down about 29% from Aug 10, is near its 52-week low of 33.03, and has a low bar. Management said it expects a meaningful financial inflection starting in Q3. Today the stock bounced about 4%, so a short-covering rally on in-line results is plausible, and the implied move is large in both directions. Price and volume: three straight declines into Oct 19, which closed at a 20-session low of 33.98 on 6,266,250 shares versus a 3,485,393 average, so volume supports continuation lower but could also mark exhaustion. Invalidation: Q3 EPS at or above about 0.59 with Q4 guidance above consensus, or a move above 37.01 (Oct 16 high).
Pre-event path: -10.72% over 5 sessions. Observed reaction: none yet; event-to-quote move is null. Expected move after the quote: about -5%.
daily_5d (US/Eastern regular sessions; session_date,open,high,low,close,volume):
2026-10-13,38.28,38.70,37.16,37.81,3378597
2026-10-14,37.42,37.42,35.63,35.73,3979021
2026-10-15,36.06,36.69,35.65,36.50,2802231
2026-10-16,36.48,37.01,34.88,35.13,4039083
2026-10-19,35.63,35.86,33.73,33.98,6266250
return_5d_pct=-10.72 (close 33.98 vs 38.06 on 2026-10-12); high_20d=43.58; low_20d=33.73; avg_volume_20d=3485393 (sessions 2026-09-22 to 2026-10-19); history source https://stockanalysis.com/stocks/alk/history/ (split-adjusted OHLC, not dividend-adjusted).
latest_price=35.33; quote_time=2026-10-20T14:43:00Z (10:43 EDT); source https://stockanalysis.com/stocks/alk/; real-time regular-session quote per the site, freshness not independently confirmed. PARTIAL SESSION as of 14:43Z: open 33.79, cumulative_volume 2012307; the listed day's range of 33.79-35.08 lags the 35.33 last price, so high_so_far and low_so_far are null; relative intraday volume cannot be established. Market cap of 3.94B is from the site at this quote. avg_dollar_volume_20d_usd is approximate (mean close x mean volume).
Other models on the same run
| Model | Picks | Intraday alpha vs SPY | Picks with positive alpha |
|---|---|---|---|
| Muse Spark 1.1 | GM, RTX, MMM, NFLX, SPCX | +3.52% | 60% |
| Perplexity | NFLX, TSLA, META, TXN, GM | +1.04% | 40% |
| Gemini 3 Pro | NFLX, TSLA, NVDA, MSFT, AMD | -1.62% | 40% |
| Grok 4.5 | NFLX, ISRG, TSLA, META, GM | +1.67% | 60% |
| DeepSeek | NFLX, ISRG, UAL, ABT, ELV | -1.25% | 60% |
| GPT-6 | NFLX, ISRG, GE, GM, RTX | +1.32% | 60% |
Written up on ForecastNest Insights: Event Gaps: Claude Sonnet 5.5's picks for 2026-10-20.
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