Arizona Cardinals vs Los Angeles Chargers
Sunday, September 13, 2026 · SoFi Stadium, Inglewood, CA
Quick Answer
As of August 1, 2026, Kalshi implies 82% for the Chargers in Arizona Cardinals vs Los Angeles Chargers, NFL Week 1 2026, while our model has the Chargers by 5.5 (66% to win) — a 15.0pp gap. Value side: the Cardinals.
ARI
-3.6
LAC
-0.4
Cardinals
34%
model win prob
Chargers
66%
model win prob
Power-rating comparison
Reading the Week 1 line on Cardinals–Chargers
Week 1 is the widest-error week of the season for every model, ours included — nothing about 2026 is on tape yet, and the ratings are priors, not measurements. With that stated plainly: the Chargers rate -0.4 (17th), the Cardinals -3.6 (30th), and the model opens on the Chargers by 5.5, 66% to win. Every number on this page will move more between now and kickoff than it will in any week that follows.
Zoom out to the full season and the model projects the Chargers at 8.2 wins (favored in 9 of 17) and the Cardinals at 6.4 (favored in 3) — 1.8 wins apart across the year. By win probability this is the 15th-hardest game on the Chargers' schedule and the 7th-hardest on the Cardinals'.
The sharpest unit gap in the game runs one way: the Chargers offense grades -0.7 (22nd of 32) against a Cardinals defense at -2.9 (29th) — 2.2 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 Chargers defense (-0.1, 10th), a 0.6-point gap. One more tilt worth noting: special teams favors the Chargers +0.4 (18th of 32) to -0.1 (30th).
One team has owned this series: the Chargers are 5-2 in 7 regular-season meetings since 2002. They last met in 2024: Cardinals won 17-15 in October. Over their last 4 meetings the Chargers are 2-2. 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.
Does the model earn this number? In 448 of the 3266 walk-forward games it has been graded on (2013-2024, no market line used), it landed in the 65-70% range. Those favourites went 68%. The 66% on the Chargers here sits in that same band, and the history backs it.
Kalshi's KXNFLGAME-26SEP13ARILAC contract implies 82% for the Chargers against our 66% — a 15.0-point gap. That clears our 5-point threshold, which flags the Cardinals as the value side at 20c.
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Cardinals vs Chargers — frequently asked
Who is favored in Cardinals vs Chargers in Week 1?
Our power-rating model favors the Chargers by 5.5 points, a 66% win probability over the Cardinals. Kalshi's KXNFLGAME-26SEP13ARILAC market implies 82% for the Chargers — a 15.0pp gap versus the model.
How reliable is a Week 1 model line?
Less reliable than any other week, and we would rather say so. The -0.4 / -3.6 ratings behind the 5.5-point line are preseason priors built from prior-season performance and roster change — no 2026 snaps are in them. Week 1 is the point of maximum uncertainty for the model and for the market, which is also why prices move most in it.
How do you take a position on Cardinals vs Chargers?
The contract is KXNFLGAME-26SEP13ARILAC on Kalshi, a CFTC-regulated exchange open to traders in all 50 states. Chargers YES is quoted around 82c against our 66% model number. 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 Chargers host the Cardinals?
Arizona Cardinals visit the Los Angeles Chargers on Sunday, September 13, 2026 — a Sunday game in NFL Week 1, at SoFi Stadium, Inglewood, CA.
What does the model project for the Chargers and Cardinals this season?
Across all 17 games the model projects the Chargers at 8.2 wins (favored in 9) and the Cardinals at 6.4 (favored in 3). This game ranks 15th-hardest on the Chargers' schedule and 7th-hardest on the Cardinals', by model win probability.
How often does the model win when it is 66% on a team like the Chargers?
68% 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 65-70% range 448 times, and those teams won 68% of them. The Chargers at 66% over the Cardinals sit in that band, off a 5.5-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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