AnalysisAI ModelsSeptember 29, 2026

Claude's $1,000 paper portfolio trails S&P 500 by 0.8 points in week 1

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After four trading days (Sep 29–Oct 2), Claude's portfolio sits at $995.66, down 0.43%, versus SPY buy-and-hold at $1,003.66, up 0.37%. The year-long experiment has Claude Sonnet 5.5 at high effort research news before each market open on a normal Claude Pro plan.

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