Stock Selection: Grok 4.5's picks for 2026-10-21
Grok 4.5 picked SMCI, SPCX, TSLA, NVDA, META for a 1-day horizon. Portfolio return vs SPY: -3.98%. Picks that beat SPY: 20%.
| Experiment | Stock Selection |
|---|---|
| Model | Grok 4.5 |
| 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 | -3.98% |
| Picks that beat SPY | 20% |
| Benchmark return | -1.08% |
The picks
| Rank | Symbol | Return | Confidence | vs benchmark | Called right |
|---|---|---|---|---|---|
| 1 | SMCI | -7.56% | 72% | -6.48% | No |
| 2 | SPCX | -7.05% | 68% | -5.97% | No |
| 3 | TSLA | +0.22% | 65% | +1.30% | Yes |
| 4 | NVDA | -2.93% | 62% | -1.85% | No |
| 5 | META | -7.97% | 58% | -6.89% | No |
The model's market view
US markets opened mixed-to-positive with AI and semiconductor names leading after SpaceX beat estimates and Super Micro raised guidance. Nasdaq futures firmed while SPY traded near flat in the morning session. Meta and Tesla report after the close, creating binary risk but also upside potential for related AI and growth names. Oil remains elevated and rates firm, yet short-term momentum favors high-beta tech and AI infrastructure plays over the broad index for the remainder of the session and into the next open.
Why each pick
SMCI
Super Micro surged on preliminary results and sharply higher next-quarter revenue and margin guidance that exceeded expectations, reinforcing AI server demand. Momentum and relative volume remain elevated intraday; the stock has already gapped higher and continues to attract buyers. Thesis is continued outperformance versus SPY on residual guidance strength and sector rotation into AI hardware. Risks include profit-taking after the large gap, any broader tech sell-off, or disappointment in related mega-cap earnings after the close.
SPCX
SpaceX reported better-than-expected third-quarter results overnight, lifting AI and space-related sentiment and driving a double-digit gain in the shares. The report also fueled speculation around a potential Tesla combination, supporting related names. Thesis is residual positive flow and momentum carrying the stock higher relative to SPY for the rest of the day. Risks are high valuation, possible fade after the initial reaction, and any negative read-through from Tesla’s own report after the close.
TSLA
Tesla is trading higher on the SpaceX earnings beat and explicit merger-consideration comments, providing a near-term catalyst independent of its own results due after the close. The stock shows strong intraday relative strength versus SPY. Thesis is continued positive momentum from the SpaceX news and positioning ahead of earnings. Risks center on the post-close report itself (guidance or robotaxi/Optimus commentary could disappoint) and high beta that could amplify any market-wide weakness.
NVDA
NVIDIA remains the core AI infrastructure beneficiary and is participating in the broader positive tone set by SpaceX and Super Micro. Shares are higher on the day with solid relative strength. Thesis is that AI-capex optimism continues to support the name versus the more defensive SPY over a one-session horizon. Risks include valuation sensitivity, any softening in semiconductor peer tone, or a negative reaction to Meta’s capital-expenditure commentary after the close.
META
Meta reports earnings after the close; the stock is already bouncing intraday from recent weakness as investors position for AI-related commentary and ad-revenue trends. Positive SpaceX/AI sentiment provides a supportive backdrop. Thesis is a constructive pre-earnings drift or post-earnings upside that outperforms SPY. Risks are elevated given the binary nature of the report—any shortfall in guidance, higher-than-expected Reality Labs losses, or cautious AI-spend comments could produce an immediate underperformance.
Other models on the same run
| Model | Picks | Portfolio return vs SPY | Picks that beat SPY |
|---|---|---|---|
| Claude Opus 5.5 | HAS, MSCI, NOC, MMM, GM | +3.27% | 100% |
| 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% |
| 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: Grok 4.5's picks for 2026-10-21.
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