65% ATS — What It Means, and What It Does Not

When we tell people our NFL simulator hit 65% against the spread, we get one of two reactions.

The first is skepticism. That number sounds high. And honestly, that is the right instinct — most published model performance figures are cherry-picked, backtested, or otherwise massaged into something more flattering than reality.

The second reaction is excitement. And that is where we have to pump the brakes.

65% ATS is a meaningful number. Break-even on a standard -110 line is 52.4%. Sustained performance above 55% is considered sharp. 65% — applied out-of-sample, on live predictions, evaluated against closing lines — represents a genuine edge.

But here is what 65% does not mean: it does not mean we win every week. It does not mean the edge is uniform across all game types, spreads, or market conditions. And it absolutely does not mean the number holds forever without continued model development and calibration.

We should also note: this number was revised downward after we discovered and corrected a model bug during the 2025-2026 season. Our original reported figure was higher. We corrected it publicly because that is what serious analytics operations do — and because transparency is a better foundation for a client relationship than inflated numbers.

What 65% means is that our simulator, as currently constructed, identifies situations where the market implied probability meaningfully underestimates one team chances — often enough to produce a statistically significant positive expectation over a full season sample.

We track this number obsessively. We evaluate it against the closing line — the sharpest available signal — rather than the opening line, because that is the honest test. And we publish it here because we believe the clients worth working with are the ones who know what these numbers actually mean.

Model performance is a conversation, not a scoreboard. We are happy to have that conversation.