Three traps when an AI assistant reads an options chain

Nvidia reports its fiscal third quarter on Tuesday, November 17, after the close. I asked Claude, with a financial-data MCP server connected, what move the options market is pricing for it. The tool calls are the easy part: GetOptionExpirations lists the dates, GetOptionChain returns the strikes with bids, asks and Greeks, and the model adds up the prices. The traps are in which numbers it picks. Here are three, with figures from a run on November 10, 2026, around 1 p.m. Eastern. The full six-prompt walkthrough is in How to Read an Options Chain With ChatGPT or Claude.

1. The at-the-money strike moves with the stock

The standard shortcut for an expected move is the at-the-money straddle: a call plus a put at the strike nearest the stock price. "Nearest the stock price" is where it goes wrong.

Nvidia closed at $178.67 on Monday, November 9, and traded at $167.13 at 12:51 p.m. the next day. A straddle anchored to the close would sit at the 177.50 strike, where the put is already more than $10 in the money, so most of its price is intrinsic value and says nothing about the report. The right strike that afternoon was 167.50. Ask the assistant to take the live quote first and to say which strike it used.

2. Open interest is yesterday's number

Bids, asks and volume update during the session. Open interest is published once a day, and in this run it carried Friday, November 6. The November 18 call at 170 showed volume of 5,052 contracts against open interest of 18.

That gap is a clue, not an error: the positions opened since Friday aren't in the count yet. An assistant that reads open interest as "where the money is today" misses the whole Monday and Tuesday sell-off. Make it date every open interest figure it quotes.

3. A straddle prices everything up to expiration

The November 18 straddle, the first expiration after the report, cost $17.83, or 10.7% of the stock. It's tempting to call that the expected report move. But it also covers every trading day between now and the report.

The fix is a second straddle on the last expiration before the report, November 16: $11.00, or 6.6%, with implied volatility near 64% against about 90% for November 18. The gap between the two, about $6.80 for two more sessions and the jump in volatility, is closer to what the market charges for the report itself.

What Nvidia has actually done

For scale, Nvidia moved 4.5% on average from report-day close to next-day close over its last seven reports, and 8.7% at most. Its 14-day average true range was $8.39 on November 9, about 4.7% of the price. Seven reports is a small sample; read it as context, not a forecast.

One prompt for report week

Nvidia reports on November 17 after the close. Using the live price, find the first expiration after the report and the last one before it, read the straddle at the strike nearest the current price on both, convert each to a percentage move, and date every open interest figure you use.

Setup for Claude or ChatGPT takes a few minutes.

Sources: How to Read an Options Chain With ChatGPT or Claude, Nvidia options chain on Equibles