Stock Selection: Grok 4.5's picks for 2026-09-17
Grok 4.5 picked NVDA, TSLA, SMH, AMD, QQQ for a 1-day horizon. Portfolio return vs SPY: +0.65%. Picks that beat SPY: 80%.
| Experiment | Stock Selection |
|---|---|
| Model | Grok 4.5 |
| Prompt version | stock-selection-v8 |
| Asked | |
| Horizon | 1-day |
| Measured from | 2026-09-17 |
| Measured to | 2026-09-18 |
| Benchmark | SPY |
| Status | Settled |
| Portfolio return vs SPY | +0.65% |
| Picks that beat SPY | 80% |
| Benchmark return | -0.20% |
The picks
| Rank | Symbol | Return | Confidence | vs benchmark | Called right |
|---|---|---|---|---|---|
| 1 | NVDA | +0.08% | 62% | +0.29% | Yes |
| 2 | TSLA | -1.09% | 58% | -0.89% | No |
| 3 | SMH | +0.71% | 55% | +0.91% | Yes |
| 4 | AMD | +2.19% | 53% | +2.39% | Yes |
| 5 | QQQ | +0.35% | 51% | +0.55% | Yes |
The model's market view
US equities open mixed on September 17 2026 with modest risk appetite after overnight futures stability. Focus remains on residual Fed policy expectations, tech leadership, and selective momentum names; SPY faces typical mid-session mean-reversion risk while high-beta and AI-related names can still diverge positively on thin catalysts.
Why each pick
NVDA
NVIDIA remains the dominant AI infrastructure name; any continuation of positive semiconductor or data-center commentary overnight or early session can drive relative strength versus the broader market. Short-term momentum and high beta favor outperformance on a one-session horizon if risk appetite holds. Risks include broader tech profit-taking or a sudden risk-off move that hits high-beta names harder than SPY.
TSLA
Tesla’s elevated beta and sensitivity to risk-on flows make it a candidate for one-day outperformance if equity futures remain constructive and no adverse headline appears. Delivery or autonomy narrative residual can still support relative strength. Risks are headline volatility, any production or regulatory news, and faster mean reversion than the broader market.
SMH
The VanEck Semiconductor ETF concentrates exposure to the chip complex that has led recent sessions. Sector momentum and relative strength versus SPY can persist for a single trading day when tech leadership continues. Risks include rotation out of semiconductors into defensives or a broad market pullback that compresses the premium.
AMD
AMD benefits from the same AI and data-center narrative as peers and often amplifies semiconductor moves on a short horizon. Positive residual momentum or any incremental product commentary can produce relative outperformance versus SPY. Risks are competitive headlines from larger peers or a sector-wide fade that hits AMD harder.
QQQ
The Nasdaq-100 ETF provides concentrated large-cap growth and tech exposure that has tended to lead SPY on constructive sessions. On a one-day horizon a continuation of growth-factor preference supports modest relative strength. Risks include any shift toward value or defensives that would cause QQQ to lag the broader market.
Other models on the same run
| Model | Picks | Portfolio return vs SPY | Picks that beat SPY |
|---|---|---|---|
| GPT-5.6 Sol | GNRC, VICR, NBIS, AMD, IREN | +0.59% | 60% |
| Claude Opus 5 | SMH, QQQ, XLV, XLK, XLE | +0.47% | 80% |
| Muse Spark 1.1 | XLF, JPM, XLE, BAC, OXY | +0.14% | 60% |
| Claude Sonnet 4.5 | GNRC, NBIS, ARM, MU, COHR | -0.38% | 60% |
| DeepSeek V3 | GNRC, NBIS, ARM, MU, COHR | -0.38% | 60% |
Written up on ForecastNest Insights: Stock Selection: Grok 4.5's picks for 2026-09-17.
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