Stock Selection: Claude Sonnet 5.5's picks for 2026-10-28
Claude Sonnet 5.5 picked NVDA, GOOGL, MSFT, AVGO, SMH for a 1-day horizon. Portfolio return vs SPY: -2.90%. Picks that beat SPY: 0%.
| Experiment | Stock Selection |
|---|---|
| Model | Claude Sonnet 5.5 |
| Prompt version | stock-selection-v8 |
| Asked | |
| Horizon | 1-day |
| Measured from | 2026-10-28 |
| Measured to | 2026-10-29 |
| Benchmark | SPY |
| Status | Settled |
| Portfolio return vs SPY | -2.90% |
| Picks that beat SPY | 0% |
| Benchmark return | -0.25% |
The picks
| Rank | Symbol | Return | Confidence | vs benchmark | Called right |
|---|---|---|---|---|---|
| 1 | NVDA | -1.69% | 55% | -1.45% | No |
| 2 | GOOGL | -12.08% | 52% | -11.83% | No |
| 3 | MSFT | -0.63% | 50% | -0.39% | No |
| 4 | AVGO | -0.81% | 48% | -0.57% | No |
| 5 | SMH | -0.51% | 45% | -0.26% | No |
The model's market view
Cautiously constructive with elevated event risk. On Oct 27 the S&P 500 closed at 7,722.60 (+0.60%) and SPY at 769.71, led by an AI and semiconductor rally after Anthropic's IPO filing, with oil easing. Today the Fed decides at 2 pm ET (a hold is priced in), and Microsoft and Alphabet report after the close, which is inside the forecast window. Breadth is thin, with the equal-weight index barely up and Nasdaq new lows outnumbering new highs. The picks lean toward AI-capex beneficiaries that can outperform SPY if the hyperscaler capex and cloud commentary is strong. The main risk is a tech selloff on a Fed surprise or a capex or Azure disappointment.
Why each pick
NVDA
Thesis: Nvidia lagged the Oct 27 chip rally (+0.90% versus +3.60% for the semiconductor index) and is about 10% below its Oct 6 record close, so it has room to catch up. Microsoft and Alphabet capex commentary after the close is a direct read-through to Nvidia's revenue line, and the Anthropic filing showed large GPU-based compute commitments. Risks: a Fed surprise, a capex disappointment or a cut to AI spending guidance, and a sharp AI-sector reversal like the Oct 22 Nasdaq drop of about 2.6%. Price check: reference_price is the Oct 27 regular-session close of 217.94, not a live intraday quote.
GOOGL
Thesis: Alphabet reports after the close today. Consensus expects about 25% revenue growth to roughly $128B and Google Cloud up about 90% to $29.1B. The stock was hit hard by the recent AI selloff and sits roughly 20% below its high, so a good print and capex story could drive a sharp rebound. Anthropic's filing also shows heavy use of Google TPUs, which supports the cloud demand narrative. Risks: the earnings reaction can be negative even on a beat (the options-implied move is about 6%), and capex or search-competition worries could weigh on it. Price check: I could not confirm a reliable current quote for GOOGL, so reference_price is omitted.
MSFT
Thesis: Microsoft reports after the close today. Expectations are for revenue growth of about 16.7% to $90.6B and Azure growth near 44.8%, with early Copilot feedback in focus. The stock is up about 50% since its June low and Microsoft has been managing costs, including buyout offers to 60,000 employees. Risks: the stock has run up into the print, and reactions have often been negative even on beats. A capex or Azure miss, or hawkish Fed commentary, could pull it below SPY. Price check: reference_price is the roughly Oct 27 session quote of 531.33 shown on a market page, with after-market near 532.65, not a verified intraday quote.
AVGO
Thesis: Broadcom rose 4.0% on Oct 27 and was flagged as the biggest winner from Anthropic's IPO filing, with Anthropic expected to be its largest compute customer in 2027. Momentum in AI chips is positive, and strong hyperscaler capex tonight would extend it. Risks: after a 4% jump it is extended and prone to profit-taking if capex commentary disappoints or the Fed is hawkish, and its beta is higher than SPY's. Price check: I could not confirm a reliable current quote for AVGO, so reference_price is omitted.
SMH
Thesis: the VanEck Semiconductor ETF gives diversified exposure to the chip rally. The semiconductor index rose 3.60% on Oct 27, its third straight gain, helped by AMD (+5.45%), Broadcom (+4.0%) and Micron (+2.77%), and the Anthropic filing points to large compute spending. Risks: it overlaps with the NVDA and AVGO picks, it is a high-beta fund that could fall hard if AI sentiment reverses on the Fed or on tonight's earnings, and KLA also reports after the close. Price check: the most recent quote I could find is the Oct 23 close of 528.03, which is stale and not an intraday price.
Other models on the same run
| Model | Picks | Portfolio return vs SPY | Picks that beat SPY |
|---|---|---|---|
| Gemini 3.6 Flash High | VRT, AMD, GOOGL, TSM, MSFT | -1.21% | 40% |
| Perplexity | MU, AVGO, SMH, TSM, CRWV | +0.24% | 20% |
| GPT-6 | VRT, MU, LRCX, SNDK, AVGO | +0.63% | 40% |
| Muse Spark 1.1 | MSFT, GOOGL, VRT, AXGN, HRI | +0.84% | 60% |
| DeepSeek | MU, VRT, WDC, SNDK, SMH | +0.74% | 40% |
Written up on ForecastNest Insights: Stock Selection: Claude Sonnet 5.5's picks for 2026-10-28.
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