Claude Fable Guide for Stock Analysis
The Complete Guide to Using AI to Spot Undervalued AI Stocks
👋 Hey there, I’m Mike. Each week I share AI articles at the intersection of tech, business, society and the future. I also try to share the work of writers from all around the world. If you want to support the channel or gain full-access to my work, go here. Read Archives | See Substack Notes | Visit our community Chat | Visit Homepage. I’ve been doing this for five years and AI is still a worthwhile topic.
Our guest writer today is Weng Honn Kan, from Malaysia. This is the second article in our Claude for Investing series, you can read the first article by Michael Fritzell here.
Claude’s Fable 5 model has quite the story. Hurry to use it for Investing purposes as Paid Claude users get just four more days with Fable before it shifts to pay-per-token pricing on July 12th. Agentic AI is about to really change how we do investing and pick stocks.
Weng Honn writes the publication How to Invest with AI.
How to Invest with AI
Discover the best AI stock analysis tools and investing strategies.
Weng Lab: Building, Testing, and Reviewing AI Investing Tools, Learn more About.
Related Articles and Resources
How to use Claude for Investing: the 4-Level System (AI Corner)
Find the winners of any market trend with claude (Compound with AI)
Build your own stock analyst with Claude
Let’s get into today’s guide:
Claude Fable Guide for Stock Analysis
The Complete Guide to Using AI to Spot Undervalued AI Stocks
How I set up Claude Fable 5 for stock research , and which of my 3 skills actually need it .
The model they tried to ban is back. Here’s how I point it at stocks.
For about two and a half weeks, the most capable AI model you could legally touch simply… vanished.
On June 12, 2026, the U.S. Commerce Department ordered Anthropic to suspend Claude Fable 5 (and its locked-down sibling, Mythos 5). The trigger was a jailbreak that Amazon’s researchers found , a prompt that got the model to flag software flaws and, in one case, write code showing how one could be abused. Because the order applied to any foreign national and Anthropic couldn’t check every user’s passport in real time, they pulled the plug for everyone.
Then, on June 30, the controls were lifted. Fable 5 came back online on July 1 across Claude.ai, Claude Code, and Cowork.
I’m not going to tell you it was “taken out because it’s too powerful and might shock the world.” That’s the internet’s version. The real version is more useful to you as an investor: the single most capable model Anthropic has ever released to the public was considered serious enough that a government reached for emergency export controls — and it’s now sitting in the same app you already use. That’s the part worth paying attention to.
So this week is a hands-on one. I’ll show you exactly how I set Fable up for stock research, what it’s genuinely better at, and — the part most people get wrong — which of my three skills actually need it, and which ones you’d be silly to waste it on.
Let’s get into it.
In this sharing you will get:
What Claude Fable 5 actually is (and why it’s different)
What Fable is genuinely best for — and what it’s overkill for
The framework: the Fable Decision Grid
How I set up my investment AI system using Claude Fable .
How to set up Fable for your stock research — step by step
Get the right skills to do the right job.
Let’s dive in…
 | A guest post by
|