Event Gaps: Claude Opus 5.5's picks for 2026-09-28
Claude Opus 5.5 picked MU, MIRM, AMD, INTC, CCL for a 1-day horizon. Intraday alpha vs SPY: -1.56%. Picks with positive alpha: 20%.
| Experiment | Event Gaps |
|---|---|
| Model | Claude Opus 5.5 |
| Prompt version | event-gap-v9 |
| Asked | |
| Horizon | 1-day |
| Measured from | 2026-09-25 |
| Measured to | 2026-09-28 |
| Benchmark | SPY |
| Status | Settled |
| Intraday alpha vs SPY | -1.56% |
| Picks with positive alpha | 20% |
| Benchmark return | -0.36% |
The picks
| Rank | Symbol | Gap direction | Price change | Return in the called direction | Confidence | vs benchmark | Called right |
|---|---|---|---|---|---|---|---|
| 1 | MU | up | -2.04% | -2.04% | 52% | -1.69% | No |
| 2 | MIRM | up | -2.27% | -2.27% | 50% | -1.91% | No |
| 3 | AMD | up | -2.73% | -2.73% | 48% | -2.37% | No |
| 4 | INTC | up | -3.85% | -3.85% | 46% | -3.50% | No |
| 5 | CCL | up | +1.33% | +1.33% | 45% | +1.68% | Yes |
The model's market view
Heading into the Monday, September 28 session, the tape is mildly risk-on but headline-sensitive. Brent crude has eased to about $105 on speculation about a Strait of Hormuz reopening, Treasury yields have backed off multi-decade highs, and semiconductors, led by server-CPU names, remain the leadership group after the Akamai-Anthropic CPU infrastructure deal. The Trump-Xi Washington summit wraps up Friday with little expectation of new Boeing orders; the focus is on a trade-truce extension, AI safeguards, soybeans and rare earths. The weekend carries two binary risks: US-Iran and Hormuz headlines, which could move oil sharply either way, and an FDA action date on Saturday, September 26 for Mirum's zilurgisertib. Monday's scheduled calendar is thin (Dallas Fed manufacturing at 10:30 ET; only micro-cap earnings before the open), so Monday gaps should be driven mainly by weekend news and positioning ahead of Tuesday's Carnival (pre-market) and Micron (after close) reports. I expect modest upside gaps in AI semiconductors and a larger, binary gap in MIRM. A volatility gauge on track for its largest weekly jump in over a year argues for small gap sizes outside the event-specific name.
Why each pick
MU
Thesis: Micron reports fiscal Q4 2026 results after Tuesday's close, with a very high consensus EPS near $31 amid AI-driven memory shortages and strong pricing power. Monday is the first full session of earnings week, and memory names typically see pre-report positioning. The AI-infrastructure news flow also supports Micron: Akamai said its Anthropic build-out includes pre-purchasing high-demand memory hardware, and semiconductor leadership remains intact. I expect a modest gap up and positive open-to-close drift as buyers position before the print. Risks: expectations above $1,000 per share are extreme, so traders may de-risk ahead of the event, turning Monday into a flat or down day after an early gap. A weekend oil or geopolitical shock would hit high-beta semiconductors hardest. Expectations vs facts: the earnings date and consensus are reported; the results themselves are unknown and occur after the target session. Price note: 1,080.53 is an overnight quote from about 3:14 AM ET on 2026-09-25, shown in the related-tickers panel of the Yahoo Finance AMD quote page, not a live regular-session quote.
MIRM
Thesis: The FDA's Priority Review action date for zilurgisertib, Mirum's oral ALK2 inhibitor for fibrodysplasia ossificans progressiva (FOP), falls on Saturday, September 26. As of this answer, no decision has been announced. A decision disclosed after Friday's close or over the weekend would show up in Monday's opening gap. Base case is approval: Leerink said the data position the drug for approval despite the primary-endpoint miss, and it would be the first oral FOP therapy in the US. With the stock near $90, far below the ~$138 average analyst target, approval could produce a sizable up-gap and potentially further buying as the launch is priced in. Risks: this is binary. The pivotal PROGRESS Cohort 1 primary endpoint was not statistically significant (p=0.0986), so a Complete Response Letter is a real possibility and would likely cause a larger gap down. If the decision lands during Friday's session, Monday's gap would be small. Biotech approvals are also often sold on the news. Expectations vs facts: the PDUFA date is officially scheduled; the outcome is unknown. Price note: 90.49 is a pre-market quote from 8:50 AM ET on 2026-09-25 (prior regular-session close 89.36 on 2026-09-24) from StockAnalysis.com.
AMD
Thesis: AMD is the leading beneficiary of the server-CPU narrative. Bank of America raised its price target by $100 on Friday, arguing the Anthropic-Akamai CPU infrastructure deal further supports CPU importance in agentic AI. The stock set a record near $630.80 on September 24, has passed $1T in market cap, and has momentum from a reported 10% Q4 price increase. Follow-through analyst notes and sustained retail enthusiasm could produce a modest Monday up-gap if Friday closes firm. Risks: price already exceeds the average analyst target (about $617), and valuation is roughly 156x trailing earnings with beta near 2.5. A weekend risk-off shock or Friday profit-taking could flip the gap negative, and extended momentum names often fade from the open. Expectations vs facts: the BofA price-target hike and the Akamai-Anthropic deal have occurred; any further analyst revisions over the weekend are anticipated, not confirmed. Price note: 641.58 is an overnight (Blue Ocean ATS) quote from about 3:14 AM ET on 2026-09-25 on Yahoo Finance; the prior regular-session close was 629.26.
INTC
Thesis: Intel is the second major way to play the AI-agent server-CPU theme. The BofA note on the Akamai-Anthropic deal flagged Intel alongside AMD and Arm as potential beneficiaries. Intel has rallied more than 35% in a month on renewed CPU demand and a report that SK Hynix is exploring a deal with it, and it was indicated about 3.9% higher overnight. Continued inflows into CPU names could produce another modest Monday up-gap. Risks: the move is extended and partly driven by an unconfirmed SK Hynix report; any denial or clarification over the weekend would reverse it quickly. Profit-taking in the CPU basket and weekend macro shocks are further downside risks. Expectations vs facts: the CPU-demand narrative and the Akamai deal are reported facts; the SK Hynix deal is an unconfirmed report and further upgrades are speculative. Price note: 127.39 is an overnight quote from the morning of 2026-09-25, shown in the related-tickers panel of the Yahoo Finance AMD quote page, not a live regular-session quote.
CCL
Thesis: Carnival reports fiscal Q3 results before the open on Tuesday, September 29, so Monday is the positioning session. The stock has fallen about 27% since August on oil, and Carnival is the only major cruise line without fuel hedges, making it the most oil-sensitive large-cap consumer name. Brent easing to about $105 on Hormuz-reopening speculation, together with stable-to-positive booking and card-spending data cited by BofA, sets up a short-covering and relief bid if weekend oil headlines stay constructive. The stock is also trading far below the ~$35 average analyst target. Risks: the gap direction depends heavily on weekend US-Iran and Hormuz headlines; a breakdown in talks and an oil spike would produce a gap down. A string of analyst price-target cuts (Goldman, Deutsche Bank, TD Cowen, JPMorgan, BofA) signals weak Q4 fuel-cost expectations, and holders may avoid owning the stock into the print. Expectations vs facts: the earnings date and call time are officially scheduled; Hormuz progress is an uncertain expectation. Price note: 21.79 is the regular-session close on 2026-09-24 from Morningstar; I could not retrieve a live intraday quote for 2026-09-25.
Other models on the same run
| Model | Picks | Intraday alpha vs SPY | Picks with positive alpha |
|---|---|---|---|
| GPT-5.6 Sol | AKAM, MSFT, NKE, CMCSA, COST | +0.20% | 60% |
| Gemini 1.5 Pro | STFS, NKE, WKEY, MRK, WDAY | +1.48% | 80% |
| Muse Spark 1.1 | MIRM, INCY, COST, NKE, KNDI | +7.09% | 80% |
| Perplexity | KNDI, MTN, JEF, POCI, GNS | +5.01% | 40% |
| Grok 4.5 | AKAM, SCHL, WTTR, PRME, MU | +0.42% | 60% |
| DeepSeek | AKAM, GRAL, BB, COST, INLF | +6.65% | 80% |
Written up on ForecastNest Insights: Event Gaps: Claude Opus 5.5's picks for 2026-09-28.
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