San Francisco 49ers vs Kansas City Chiefs
Sunday, December 27, 2026 · GEHA Field at Arrowhead Stadium, Kansas City, MO
Quick Answer
As of August 1, 2026, our model favors the Chiefs by 1 in San Francisco 49ers vs Kansas City Chiefs, NFL Week 16 2026 — 53% to win, and effectively a toss-up — the teams are 1.3 rating points apart. Kalshi has not listed KXNFLGAME-26DEC27SFKC yet, so there is no price to compare: when it opens, Chiefs at 48c or below (or 49ers at 42c or below) is where the model would take a position.
SF
+0.8
KC
-0.5
49ers
47%
model win prob
Chiefs
53%
model win prob
KXNFLGAME-26DEC27SFKChasn't opened yet, so there is no price to compare. When it does, the model buys the Chiefs at 48c or below, or the 49ers at 42c or below — a five-point threshold either way. The market column fills in automatically.
Power-rating comparison
49ers–Chiefs is a coin flip on our numbers
The better team here is the visitor, and it still is not favored. The 49ers rate +0.8 (14th of 32) against -0.5 for the Chiefs (20th) — but 2.5 points of home field is larger than the 1.3-point gap between them, so the model lands at 53% for the Chiefs anyway. That is the whole story of this line: venue, not talent. It rates as the 5th-closest of the 16 games in Week 16, and a game this tight is decided by the price, not the model.
Season-long, the model can barely split them: 8.2 projected wins for the Chiefs against 8.8 for the 49ers, favored in 8 and 8 of their 17 respectively. Two teams heading for the same neighborhood in the standings tend to produce exactly this kind of line. This game sits 11th-hardest on the Chiefs' schedule and 8th-hardest on the 49ers'.
The sharpest unit gap in the game runs one way: the 49ers offense grades +2.9 (6th of 32) against a Chiefs defense at -0.8 (18th) — 3.7 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 49ers defense (-2.9, 31st), a 2.9-point gap. Special teams adds to it: the 49ers grade +0.9, 4th in the league, against +0.4 (19th) on the other side — close to a point of hidden margin.
On the calendar, the 49ers are on 10 days and the Chiefs are on 6 days. The 49ers come in off the Chargers, the Chiefs off the Patriots. None of that is in the model line — our rating model prices teams and home field, nothing else — so rest and travel are yours to weigh on top of the number, not inside it.
One team has owned this series: the Chiefs are 5-2 in 7 regular-season meetings since 2002. They have also met 2 times in the playoffs. They last met in 2024: Chiefs won 28-18 in October. Over their last 4 meetings the Chiefs are 3-1. Worth saying plainly — the model does not know any of that. It reads 2026 ratings and nothing else, so a lopsided series is a story, not a number on this page.
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 50-55% in 870 of them, and those sides won 52%. The Chiefs at 53% are in that band. A margin that thin is why we would rather wait for a price than call it a lean.
No price exists for this game yet; KXNFLGAME-26DEC27SFKC is not listed, and a model number is not a market number. Because the model is close to even here — 53% / 47% — the tradable window is narrow: Chiefs at 48c or below, 49ers at 42c or below, and a pass on everything between. On near-coin-flips the opening price usually lands inside that window, which is why most games like this end up as no-position. 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.
49ers vs Chiefs — frequently asked
Who is favored in 49ers vs Chiefs in Week 16?
Our power-rating model favors the Chiefs by 1 points, a 53% win probability over the 49ers. The Chiefs rate 20th of 32 (-0.5) and the 49ers 14th (+0.8); Kalshi has not listed KXNFLGAME-26DEC27SFKC yet, so the model line is the only number on the board.
Why does the model call this a toss-up?
Because the Chiefs (-0.5, 20th) and 49ers (+0.8, 14th) are only 1.3 rating points apart. The 2.5-point home-field adjustment is larger than the gap between the teams, so home field is effectively the entire margin and the split lands at 53%/47%. In games like this the model is not the deciding input — the contract price is.
How do you take a position on 49ers vs Chiefs?
The contract will be KXNFLGAME-26DEC27SFKC on Kalshi, a CFTC-regulated exchange open to traders in all 50 states. It has not opened yet; when it does, the model would take the Chiefs at 48c or below, or the 49ers at 42c or below. There is no point spread — you buy a yes or no contract on a team and it settles at $1 or $0.
When and where do the Chiefs host the 49ers?
San Francisco 49ers visit the Kansas City Chiefs on Sunday, December 27, 2026 — a Sunday game in NFL Week 16, at GEHA Field at Arrowhead Stadium, Kansas City, MO.
What does the model project for the Chiefs and 49ers this season?
Across all 17 games the model projects the Chiefs at 8.2 wins (favored in 8) and the 49ers at 8.8 (favored in 8). This game ranks 11th-hardest on the Chiefs' schedule and 8th-hardest on the 49ers', by model win probability.
How often does the model win when it is 53% on a team like the Chiefs?
52% of the time. Over 3266 walk-forward games from 2013-2024 — trained only on prior seasons, no market line as an input — the model put a team in the 50-55% range 870 times, and those teams won 52% of them. The Chiefs at 53% over the 49ers sit in that band, off a 1-point model line. Straight-up across all 3266 graded games the model picked winners at 59.6%, with a Brier score of 0.236 against 0.25 for a coin flip.
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