Which AI Model Should You Use for Investing?
An honest, model-agnostic guide to picking the right AI for each investing task — reasoning vs retrieval vs long-context — plus a prompt that routes your question to the right tool. We publish a newsletter, not a model, so this is a straight answer.
For: Retail investors · analysts · anyone deciding which AI to pay forThere is no single best AI model for investing — there is a best model per task. Need current prices, breaking news, or a cited live filing? Use a web-connected model (Perplexity, or a browsing-enabled ChatGPT or Gemini). Pasting a document and want careful, well-structured analysis with quotes? Use a strong reasoning model (Claude, or a reasoning-tier GPT). Feeding an entire 10-K, a full transcript, or several filings at once? Prioritize a long-context model. The three capabilities that actually matter for finance work are retrieval (can it get live, correct data?), reasoning (can it hold a multi-step argument without drifting?), and context length (how much can you paste?). Pick for the capability the task needs — and never trust any model's numbers without checking them against the primary source. Educational only, not financial advice.
“Which AI is best for stocks?” is the wrong question, and the comparison posts that answer it with a single winner are mostly measuring vibes. The models leapfrog each other every few months, and any name we crown today is stale by next quarter. What doesn't go stale is the framework: investing work breaks into a handful of task types, and each rewards a different capability. Learn to route by capability and you'll pick correctly no matter which lab is ahead this month. Here's the map, then a prompt that does the routing for you.
Match the capability to the task
| Your task | Capability that matters | Model type to reach for |
|---|---|---|
| Current price, quote, or breaking market news | Live retrieval | Web-connected (Perplexity; browsing ChatGPT / Gemini) |
| Tear down a 10-K, transcript, or 13F you paste in | Reasoning + long context | Reasoning model with a large context window (Claude; reasoning-tier GPT) |
| Compare five filings or a whole annual report at once | Long context | Whichever model offers the largest usable context |
| Draft a memo, thesis, or IC write-up | Reasoning + writing | Strong reasoning/writing model |
| “What are people saying about this name right now?” | Live retrieval + citations | Web-connected with source links |
| Build a repeatable screen or workflow | Reasoning + tool use | Reasoning model, ideally with data connectors |
Note: specific product names shift constantly — treat the middle column as the durable answer and re-check which product leads on that capability before you subscribe.
The routing prompt (copy-paste)
Paste this into any assistant to have it tell you which type of model your task needs before you start.
I want to use AI for this investing task: [DESCRIBE THE TASK]. Before answering the task, tell me: 1. Which capability it most needs — live retrieval, reasoning, or long context — and why. 2. Whether it requires current data. If yes, warn me that a model without live web access will give stale or invented figures, and tell me what to verify. 3. The single biggest way an AI could get this wrong, and the one check that catches it. Then, only if you have the data or I have pasted it, complete the task. Quote your sources. If you are answering from training data with a cutoff, say so explicitly.
Get all 7 workflows in one pack
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Frequently asked
What is the best AI model for stock analysis?
There is no single best model — the right choice depends on the task. Use a web-connected model (Perplexity, or a browsing-enabled ChatGPT or Gemini) when you need current prices, news, or cited live filings. Use a strong reasoning model (Claude, or a reasoning-tier GPT) when you paste a document and want careful, structured analysis. Use a long-context model when you feed an entire 10-K, transcript, or multiple filings at once. Match the model to the job. Educational only, not financial advice.
Can AI models give live stock prices?
Only if the model has live web or tool access at the moment you ask. A plain chat model answers from training data with a cutoff and will confidently give a stale or invented price. If you need a current quote, use a web-connected mode and still verify against your broker or a primary source before acting. Do your own research (DYOR).
Do AI models make up financial numbers?
Yes. Language models can fabricate figures, ratios, and quotes — especially when asked to recall data instead of being given it. The defense is to paste primary-source data directly, force the model to quote it, and cross-check every number against the original filing before it informs a decision. Never paste material non-public information into a consumer AI tool.