$388.51$435.00$475.85
Same chat. Same question — Microsoft’s long-term average price. Three different answers, each delivered as fact. AI sounds sure when it doesn’t know. The Prompt Stack is built to catch the gap.
→ See the fixFor investors. And anyone tired of confident AI guesses.
I run AI on my own investment decisions. This is what I find.
I ask AI to help me invest. Then I check its working.
// Free PDF The Prompt Stack: A Field Guide · 20 pages →Tested on real trades
Methods you can copy
Tools rated honestly
// 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 for stock research
Which tool to open for which task. Per-task verdicts, no hedging.
03 / The Failure
AI limitations in options trading
Where AI breaks. Real fabrications, named tools, named failure modes.
// From the lab
Tool Audit
Robinhood Cortex Digests: missing on web, working on mobile
Robinhood Cortex Digests review: missing on the UK website, working cleanly on the mobile app, useful only for well-known company names.
Lab ReportAI covered calls: when NOT to sell another one
AI covered call re-entry: the five conditions where the rules say wait, the prompt that runs the check, and six real BMNR trades behind it.
Prompt Stack5 AI prompts for earnings call analysis: what the numbers don't tell you
Five AI prompts for earnings call analysis that find what the numbers don't: omissions, hedge patterns, and language drift from last quarter.
// Archive
Decision Process What AI gets right (and wrong) about options trading Tool Audit Best AI tools for earnings analysis: I tested three on a real results release Tool Audit ChatGPT vs Claude vs Perplexity vs Gemini for stock research: a real test Tool Audit Best free AI tools for stock research Prompt Stack The single prompt change that made AI analysis worth using Decision Process 5 questions to ask AI before buying any stock
// About Ben
I started using AI tools to invest because I wanted to know if they were any good. The site is what I found — what I asked, what I got back, and which bits were worth keeping. Read more →
// The Method
Four prompts that stop AI inventing the answer.
// Field Guide
The Prompt Stack: A Field Guide.
20 pages. The full methodology, two real tests, a printable reference card. Free, no email. What's inside →
Download the PDF →Free. No email required.