San Francisco 49ers vs Arizona Cardinals
Sunday, January 10, 2027 · State Farm Stadium, Glendale, AZ
Quick Answer
As of August 1, 2026, our model favors the 49ers by 2 in San Francisco 49ers vs Arizona Cardinals, NFL Week 18 2026 — 56% to win, and the second NFC West meeting of the year. Kalshi has not listed KXNFLGAME-27JAN10SFARI yet, so there is no price to compare: when it opens, Cardinals at 39c or below (or 49ers at 51c or below) is where the model would take a position.
SF
+0.8
ARI
-3.6
49ers
56%
model win prob
Cardinals
44%
model win prob
KXNFLGAME-27JAN10SFARIhasn't opened yet, so there is no price to compare. When it does, the model buys the Cardinals at 39c or below, or the 49ers at 51c or below — a five-point threshold either way. The market column fills in automatically.
Power-rating comparison
The rematch: what the model sees the second time around
This is the second meeting. The 49ers and Cardinals already played in Week 3, and now the 49ers make the return trip in Week 18. Familiarity does not show up in a power rating, so the model prices it the same way it prices everything else: -3.6 against +0.8, plus home field, equals the 49ers by 2 (56%). Where a rematch does matter is the standings — a division sweep is worth more than the two wins suggest.
The sharpest unit gap in the game runs one way: the 49ers offense grades +2.9 (6th of 32) against a Cardinals defense at -2.9 (29th) — 5.8 points of separation on our scale, and the single biggest reason the line sits where it does. Going the other direction, the Cardinals offense (-0.7, 23rd) meets the 49ers defense (-2.9, 31st), a 2.3-point gap. Special teams adds to it: the 49ers grade +0.9, 4th in the league, against -0.1 (30th) on the other side — close to a point of hidden margin.
On the standings side, NFC West games are the ones that decide the tiebreakers. Head-to-head record is the first tiebreaker between two teams in the same division, and division record is the next — so the value of this result is not just the win column. They already played in Week 3, so a season sweep is on the table here on the NFC West race.
Zoom out to the full season and the model projects the Cardinals at 6.4 wins (favored in 3 of 17) and the 49ers at 8.8 (favored in 8) — 2.4 wins apart across the year. By win probability this is the 14th-hardest game on the Cardinals' schedule and the 11th-hardest on the 49ers'.
Recent history, for context only: 48 regular-season meetings since 2002, 26-22 in the 49ers' favour. They last met in 2025: 49ers won 41-22 in November. Over their last 4 meetings the Cardinals are 2-2. 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 49ers at 56% 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-27JAN10SFARI is not listed, and a model number is not a market number. Because the model is close to even here — 44% / 56% — the tradable window is narrow: Cardinals at 39c or below, 49ers at 51c 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.
Full division picture on the NFC West hub.
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 Cardinals — frequently asked
Who is favored in 49ers vs Cardinals in Week 18?
Our power-rating model favors the 49ers by 2 points, a 56% win probability over the Cardinals. The Cardinals rate 30th of 32 (-3.6) and the 49ers 14th (+0.8); Kalshi has not listed KXNFLGAME-27JAN10SFARI yet, so the model line is the only number on the board.
How much does a NFC West result matter here?
Head-to-head is the first tiebreaker between two NFC West teams and division record is the next, so this result carries more than one game of standings weight. These two also meet in Week 3. Our model does not adjust for any of that — it prices the 49ers by 2 on ratings and home field alone.
How do you take a position on 49ers vs Cardinals?
The contract will be KXNFLGAME-27JAN10SFARI 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 Cardinals at 39c or below, or the 49ers at 51c 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 Cardinals host the 49ers?
San Francisco 49ers visit the Arizona Cardinals on Sunday, January 10, 2027 — a Sunday game in NFL Week 18, at State Farm Stadium, Glendale, AZ.
What does the model project for the Cardinals and 49ers this season?
Across all 17 games the model projects the Cardinals at 6.4 wins (favored in 3) and the 49ers at 8.8 (favored in 8). This game ranks 14th-hardest on the Cardinals' schedule and 11th-hardest on the 49ers', by model win probability.
How often does the model win when it is 56% on a team like the 49ers?
57% 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 55-60% range 797 times, and those teams won 57% of them. The 49ers at 56% over the Cardinals sit in that band, off a 2-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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The first meeting
These two already played once in 2026, back in Week 3. Division games are the pairings the model gets two swings at, and the second line usually moves off what the first one showed. 49ers–Cardinals, Week 3 →
More Week 18 matchups
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