Re-ran two prompts on Claude Opus 4.7 with live search on.
Generated a complete BMNR options table — IV ~75%, strikes, premiums — from a prompt that supplied only the stock price.
Returned a specific earnings date for an upcoming W4 release, sourced from MarketBeat via web search, with no uncertainty…
I run AI on my own investments. I check what it gets wrong.
Tuesdays · what worked, what didn't, the prompts I'd run again.
// The author
// New here? Start with these.
01 / The Method
The single prompt change that made AI analysis worth using
Start here. The one prompt change that fixes most AI investment outputs.
02 / The Comparison
ChatGPT vs Claude vs Perplexity vs Gemini for stock research (2026): a real test
Which tool to open for which task. Per-task verdicts, no hedging.
03 / The Failure
What AI gets right (and wrong) about options trading
Where AI breaks. Real fabrications, named tools, named failure modes.
// From the field · 1 new this week
Field Notes
Claude prompts for investing: 6 real examples
Six Claude prompts for investing — with the actual outputs each one returned on MSFT, META and NVDA, and what had to be checked before using them.
Prompt StackThe one AI prompt I run the morning before earnings
Most AI earnings prompts are reactive. This AI earnings pre-trade prompt runs the morning before — commit your sell, add, and hold triggers before the call.
Tool AuditRobinhood Cortex Digests review: missing on web, working on mobile
I tested Robinhood Cortex Digests on my UK ISA for a week. Missing from the website, working on the mobile app, useful only for well-known names — what it surfaces and what it can't.
// Archive
Field Notes AI covered calls: when NOT to sell another one Prompt Stack 5 AI prompts for earnings call analysis (2026): what the numbers don't tell you Decision Process What AI gets right (and wrong) about options trading Tool Audit Best AI tools for earnings analysis (2026): I tested three on a real results release Tool Audit ChatGPT vs Claude vs Perplexity vs Gemini for stock research (2026): a real test Tool Audit Best free AI tools for stock research (2026)
// The Method Four prompts that stop AI inventing the answer.
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