Stock Selection: Claude Opus 5.5's picks for 2026-10-21
Claude Opus 5.5 picked HAS, MSCI, NOC, MMM, GM for a 1-day horizon. Portfolio return vs SPY: +3.27%. Picks that beat SPY: 100%.
| Experiment | Stock Selection |
|---|---|
| Model | Claude Opus 5.5 |
| Prompt version | stock-selection-v8 |
| Asked | |
| Horizon | 1-day |
| Measured from | 2026-10-21 |
| Measured to | 2026-10-22 |
| Benchmark | SPY |
| Status | Settled |
| Portfolio return vs SPY | +3.27% |
| Picks that beat SPY | 100% |
| Benchmark return | -1.08% |
The picks
| Rank | Symbol | Return | Confidence | vs benchmark | Called right |
|---|---|---|---|---|---|
| 1 | HAS | +3.31% | 62% | +4.38% | Yes |
| 2 | MSCI | +2.04% | 58% | +3.11% | Yes |
| 3 | NOC | +1.93% | 55% | +3.01% | Yes |
| 4 | MMM | +1.91% | 52% | +2.98% | Yes |
| 5 | GM | +1.78% | 45% | +2.86% | Yes |
The model's market view
SPY is flat to slightly higher early on Oct 21 (770.30, +0.16% at 10:44 ET) in the heart of Q3 earnings season. The best one-session relative-strength setups are large caps that reported clean beats with raised guidance on Oct 20 and are now collecting a wave of analyst price-target increases (post-earnings drift), plus one oversold large cap with buyback support. Picks are equal weight and long-only; key shared risk is a broad risk-off turn that drags higher-beta names below SPY.
Why each pick
HAS
Thesis: Hasbro rose 11.2% on Oct 20 after a large Q3 beat (adjusted EPS 2.90 vs 1.85 consensus, revenue 1.6B vs 1.48B) driven by Magic: The Gathering; it raised full-year revenue growth to 7-9% and adjusted EBITDA guidance and doubled its buyback target. On Oct 21 Citi (137), Roth
(125) and BofA
(118) raised targets; the stock closed Oct 20 at its session high and a new 20-day high and is extending (+1.4%, day high 112.79). Fundamental revisions support post-earnings drift. Risks: price already near the consensus target (~111), Oct 20 volume ~3.7x average could mark short-term exhaustion. Price: live regular-session quote 111.07 at 10:24 ET Oct 21 (stockanalysis.com real-time page).
MSCI
Thesis: MSCI rose 5.0% on Oct 20 after Q3 showed record recurring net-new sales in Analytics and Private Capital Solutions and accelerating Index revenue from higher ETF/indexed AUM, with management citing a strong Q4 pipeline. Overnight and this morning JPMorgan (710), Wells Fargo (720), Morgan Stanley (671), Goldman
(684) and Clear Street raised targets, and shares are extending (+1.33% to 599.58, day high 602.76). Recurring-revenue quality makes estimate revisions sticky. Risks: high valuation and sensitivity to equity-market levels; a market pullback would hit index-asset fees sentiment. Price: live regular-session quote 599.58 at 10:29 ET Oct 21 (stockanalysis.com).
NOC
Thesis: Northrop rose 4.6% on Oct 20 after B-21, F-35, Sentinel and missile growth lifted Q3 profit, it raised full-year EPS guidance and reported a record backlog. Oct 21 brought a Baird upgrade to Outperform plus target raises from Morgan Stanley (765), UBS (698), Guggenheim
(640) and RBC (550). Defense names are also lower-beta, which helps relative performance if the tape weakens. Risks: the stock is giving back early gains (535.52 vs a day high of 544.33), suggesting sellers into strength; budget/policy headlines. Price: live regular-session quote 535.52 at 10:39 ET Oct 21 (stockanalysis.com); note the page's displayed day range low (535.87) is slightly above the quoted last price, so the quote may be marginally inconsistent.
MMM
Thesis: 3M rose 5.8% on Oct 20 on an adjusted EPS beat (2.50 vs ~2.38), raised FY EPS guidance to 9.10-9.15 and an expanded data-center optical-connectivity deal with Amazon (warrants vesting on up to 6B of purchases). Fresh catalyst within the window: around 10:30 ET Oct 21, 3M and AWS announced an optical connectivity collaboration and AWS investing in 3M's Expanded Beam Optics technology; Deutsche Bank
(197) and JPMorgan
(191) raised targets. Shares dipped this morning (-0.73% to 170.12, low 167.71), giving a better entry for the AI data-center narrative. Risks: EBO revenue is small until 2027-2028 and the dip may reflect profit-taking that continues. Price: live regular-session quote 170.12 at 10:37 ET Oct 21 (stockanalysis.com).
GM
Thesis: GM fell 6.84% on Oct 20 (worst day in over a year) despite a Q3 beat, on a lower full-year profit outlook midpoint, but it announced a new 20B multiyear buyback and raised cash-flow guidance; Morgan Stanley called the dip overblown and Buy-rated brokers trimmed targets (96-109) while keeping ratings. The stock held above its Oct 20 low of 75.08 in early trading, and the large buyback plus ~5.5x forward P/E can attract dip buyers for a relative bounce. Risks: six-plus target cuts, commodity-cost and truck production headwinds, CEO warning of intensifying challenges; a break below 75.08 would negate the rebound. Price: regular-session quote 76.84 at 9:53 ET Oct 21 (stockanalysis.com), about one hour stale at answer time because the page would not refresh.
Other models on the same run
| Model | Picks | Portfolio return vs SPY | Picks that beat SPY |
|---|---|---|---|
| Muse Spark 1.1 | BRZE, HAS, TSLA, META, NVDA | -0.28% | 60% |
| Perplexity | SPY, AAPL, MSFT, NVDA, AMZN | -0.45% | 40% |
| Gemini 3 Pro | SMCI, GE, RTX, NOC, XLV | -0.59% | 60% |
| Grok 4.5 | SMCI, SPCX, TSLA, NVDA, META | -3.98% | 20% |
| DeepSeek | SPCX, SMCI, VRT, MU, NBIS | -5.90% | 0% |
| GPT-6 | SMCI, SPCX, COF, DELL, NVDA | -4.40% | 0% |
Written up on ForecastNest Insights: Stock Selection: Claude Opus 5.5's picks for 2026-10-21.
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