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Let AI models trade stocks autonomously with $1k each

Poster ran four AI models on a weekday pre-market prompt to trade $1,000 portfolios each for nine weeks; ChatGPT came out ahead.

What they did

The poster set up four paper-trading portfolios with $1,000 each on Alpaca and ran the same weekday pre-market prompt against ChatGPT, Gemini, Claude, and Perplexity with Deep Research enabled. Each model could only return BUY, SELL, HOLD, or CANCEL, the trading flow was automated in Python and logged publicly, and the poster says they did not override any decisions.

How it went

After nine weeks, ChatGPT led at +21.1%, helped by healthcare picks including IOVA doubling and ACHC rising 52%. Perplexity was +1.1%, Gemini -6.6%, Claude -11.5%, and the poster stressed it was paper money and too early to trust blindly.

Worth knowing

One practical catch from the thread is that ChatGPT sat entirely in cash for almost three weeks before making trades, so the system may do nothing for long stretches.

Labels

ScopePersonalPoster ran four AI models on a weekday pre-market prompt to trade $1,000 portfolios each for nine weeks

For whomIndividualThe poster set up four paper-trading portfolios with $1,000 each on Alpaca

What the agent doesBuying and sellingPoster ran four AI models on a weekday pre-market prompt to trade $1,000 portfolios each for nine weeks

How autonomous the agent isActs aloneLet AI models trade stocks autonomously with $1k each

Agent or ordinary appAgent productEach model could only return BUY, SELL, HOLD, or CANCEL, the trading flow was automated in Python and logged publicly, and the poster says they did not override any decisions.

Already a company's productNoThe poster set up four paper-trading portfolios with $1,000 each on Alpaca and ran the same weekday pre-market prompt against ChatGPT, Gemini, Claude, and Perplexity with Deep Research enabled.

What kind of materialunverifiedReview testThe poster set up four paper-trading portfolios with $1,000 each on Alpaca and ran the same weekday pre-market prompt against ChatGPT, Gemini, Claude, and Perplexity with Deep Research enabled.

The “Material” label failed its quality check and is not used for selection.

Details

Agents: Gemini
Source: Reddit
Source date: Mar 12, 2026
Accounts: 1
In registry since: Oct 12, 2026

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