New England Patriots vs Kansas City Chiefs

Start with the conditions, because they are the one thing about this game we can measure historically. Across 15 Kansas City home games in December since 2015, the median kickoff temperature was 39°F with 9 mph of wind, and 53% of them were at or below 40°F — the coldest in the sample read 2°F. Our model prices none of that: it sees -0.5 for the Chiefs, +5.4 for the Patriots, and lands on the Patriots by 3.5 (60%). Weather is an argument you add to that number, not one already inside it.

The sharpest unit gap in the game runs one way: the Patriots offense grades +3.9 (4th of 32) against a Chiefs defense at -0.8 (18th) — 4.7 points of separation on our scale, and the single biggest reason the line sits where it does. Going the other direction, the Chiefs offense (-0.1, 20th) meets the Patriots defense (+1.3, 6th), a 1.4-point gap.

Zoom out to the full season and the model projects the Chiefs at 8.2 wins (favored in 8 of 17) and the Patriots at 11.0 (favored in 15) — 2.8 wins apart across the year. By win probability this is the 5th-hardest game on the Chiefs' schedule and the 7th-hardest on the Patriots'.

Scheduling note: this is a Monday game — the only one on the schedule that day — so it sits outside the main Sunday slate.

Recent history, for context only: 11 regular-season meetings since 2002, 6-5 in the Chiefs' favour, plus 2 playoff games. They last met in 2023: Chiefs won 27-17 in December. Over their last 4 meetings the Chiefs are 3-1. It is not an input to the line — rosters turn over faster than series records do.

Calibration check, because a near-even number is the easiest kind to overtrust: across 3266 walk-forward games (2013-2024) the model gave a side 55-60% in 797 of them, and those sides won 57%. The Patriots at 60% are in that band. A margin that thin is why we would rather wait for a price than call it a lean.

Kalshi has not listed KXNFLGAME-26DEC21NEKC, so there is no price on the board and no edge to quote. The model's number to hold it to: Chiefs 40%, Patriots 60%. Applying our five-point threshold, that makes Chiefs contracts a buy at 35c or below and Patriots contracts a buy at 55c or below — anything between is inside the noise, and we pass. Week 1's KXNFLGAME contracts opened in May 2026 and the rest of the slate lists as the season gets closer; this page picks up the price automatically when it does.

Prediction markets are not sportsbooks — you trade a contract that settles at $1 or $0, not a wager against a house line. Informational only; trade responsibly.