Tool Audit.
Does the tool do the task, or just sound like it did? One invented an options table. One misread an annual report by a factor of a thousand. Verdicts per task, with the screenshots.
Posts here put named AI tools against tasks I'd run anyway: same prompts, same day, fresh conversations, outputs saved verbatim. Verdicts are per task, not per tool, because no single tool wins a whole research session. In my testing Claude reads documents best, Perplexity is for cited retrieval, ChatGPT is the dependable middle, and Gemini structures research well on big names, and invents things around options.
Each audit names a winner for the task it tested, shows the screenshots behind the verdict, and records what each tool got wrong as carefully as what it got right. The worst failures (an invented options premium table, an annual-report misread off by a factor of a thousand) are kept on /lessons with dates and screenshots.
Tools change fast, so every post carries the model version and the date it ran. A verdict from January isn't a verdict on today's model, which is half the argument for testing rather than trusting.
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Is Grok good for stock research? I ran the same test on the fifth tool
Is Grok good for stock research? I ran four dimensions of my AI comparison on its free tier: strong reasoning, one unit slip, a constraint it would not keep.
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AI stock research tools tested: what each one got wrong
AI stock research tools tested on real trades: ChatGPT, Claude, Gemini and Perplexity, with the specific failure of each, named, dated, and screenshotted.
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Is Perplexity good for investment research? An honest, scored audit
Is Perplexity good for investment research? Every review I found was a glowing feature tour. I tested it on real names and scored where it works and breaks.
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Robinhood Cortex Digests review: tested in May, gone by June
I tested Robinhood Cortex Digests on a UK ISA in May 2026, checking its numbers line by line against Meta's results. By June it had vanished from UK accounts.
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Best free AI for stock market analysis: 7 tested (2026)
Seven free AI tools for stock market analysis, each tested at its real free tier. No trials counted as free. One per stage, with the honest limit on each.
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