AI Backtest Guardrail Fails: Benchmark Finds Date Prompt Cuts GPT-5 Knowledge Claims 39% to 1%
· techtimes.com · popularity 20/100 · 0 similar stories today · AI & Data Science (Artificial Intelligence)
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Summary
AI backtest safeguards fail a new test. The FinDendro benchmark, posted to arXiv on Nov. 4, finds that telling GPT-5 to answer as of a past date cuts its knowledge claims from 39% to 1% while accuracy holds near 75%. The authors say vendor cutoffs, self-reports and date prompts cannot certify a financial LLM backtest as free of look-ahead bias.
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