AI article
The `epsActual` That Wasn't: 15% of an LLM Backtest's Trades Were Decided on Data That Didn't Exist Yet
Vendor 'actual' earnings get silently revised after the fact. We measured how much look-ahead bias that injects into an LLM trading backtest — and how to mak...
Dev.to | Jun 18, 2026 | Li Zhuojun