The market beat seven AI models on this game, and what the seven missed is the thing I should have caught before kickoff. Kalshi was closer than the panel on 30 of the 46 lines once Kansas City had won 31-10. Every line the panel lost on the margin ladder traces to one number: Denver's 68 sacks last season against Kansas City's 35. The seven read that gap as a reason to lean Denver. The market read Patrick Mahomes at full practice all week and did not move. I graded the field-goal rung the panel's way before the game, so this is my miss as much as theirs. A sack count from last season is not a reason the market does not already have.
Kansas City won at Arrowhead on Monday night, September 14, 2026, and the final score settled every Kalshi line on this page. Kalshi had the Chiefs at 55.5¢ before kickoff. The panel, which priced the game on September 2 without seeing that number, had them at 50.8%, a coin flip. The Chiefs won by 21, the last rung on the margin ladder and further than either side priced. The panel's 16 wins were the higher totals and the five longest Chiefs margins, the only rungs it already had above the market.
Graded September 20, 2026, on Kalshi's settlements of the 31-10 final. Market prices are Kalshi's on September 13, 2026, at 11:45 a.m. ET, the page's last update before kickoff; the panel's numbers are its September 2 run and never moved.
| Kalshi | Panel | Settled | |
|---|---|---|---|
| Chiefs win | 55.5¢ | 50.8% | Yes, 31-10 |
| Chiefs by 3+ | 49.5¢ | 43.7% | Yes, by 21 |
| Broncos by 3+ | 40¢ | 43.8% | No |
| Over 43.5 | 49.5¢ | 43.7% | No, 41 points |
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How The Call Graded: Chiefs 31, Broncos 10
A Kalshi contract settles at $1 if the thing happens and $0 if it does not, so every row can be scored the same way: the side that was nearer to $1 on a Yes, or nearer to $0 on a No, had the better price.
| Group | Lines | Market closer | Panel closer | What settled |
|---|---|---|---|---|
| Winner (both sides) | 2 | 2 | 0 | Chiefs, Yes at 55.5¢ vs 50.8% |
| Chiefs margin rungs | 14 | 9 | 5 | All fourteen Yes; Chiefs by 21 |
| Broncos margin rungs | 11 | 11 | 0 | All eleven No |
| Total-points rungs | 19 | 8 | 11 | Over 40.5 and lower Yes, over 41.5 and higher No; 41 points |
| All 46 lines | 46 | 30 | 16 | 23 Yes, 23 No |
The Broncos ladder is where the panel lost. It was above the market on all eleven Denver margin rungs, the heart of its lean, and all eleven settled No. On the Chiefs ladder the only five rungs it won were the five where it already sat above the market, by 14 or more through by 21 or more, and it won those by 0.3 to 2 points on rows both sides had under 17%. Outside those five rungs, the panel lost 30 of the other 41 lines.
The 30-16 count is rungs, not independent calls: one 21-point result decided all 25 margin rungs at once. The fairer measure is the Brier score, the average squared miss, where lower is better and answering 50% to every question scores 0.250. Across all 46 lines the market scored 0.234 and the panel 0.246, and both barely beat the coin flip. A 21-point home win sat at the far end of what either side priced, so this was a bad night for the panel and not a good one for the market either.
The totals are the panel's one win. The game landed on 41 points, half a point under the rung the panel had at exactly 50.0% and the market had at 56.5¢. The panel was under the market on all nineteen totals, so it won every rung that settled No and lost the eight that settled Yes, and the widest gap on the board, over 42.5 points at 7.2, went its way. On the totals alone the panel's Brier score beats the market's, 0.095 to 0.105; on the other 27 lines the market wins, 0.325 to 0.352. Every line goes on the full graded scoreboard.
Why The Panel Sided With Denver
Written before the game.
Denver won 14 games and outscored its opponents by 90 points. Kansas City won six and outscored its opponents by 34. The standings gap came from one-score games, where Denver went 11-2 and Kansas City went 1-9, and close-game records are unstable from one season to the next, so the panel refused to read the 2025 records as a description of the two rosters. Run both point differentials through a Pythagorean estimate and Denver comes out near 11 wins, Kansas City near 9.5.
Denver recorded 68 regular-season sacks in 2025 and Kansas City 35, the widest single gap between these rosters, and it points at a Kansas City line breaking in new pieces: left tackle Josh Simmons did not practice all week and the Chiefs ruled him out on September 12, which puts rookie Kahlil Benson at left tackle. A quarterback in his first live football since December, behind a line still learning its calls, against the league's most productive pass rush.
The total is unanimous: all seven sit under the market on all 19 rungs. These teams have averaged 41.2 points a game since 2018 and 33.7 across their last six meetings, both defenses allowed fewer than 20 a game last season, and Week 1 games are sloppy.
What happened.
Monday went against the first two arguments. The team the standings called 6-11 beat the 14-3 team by three touchdowns, and the pass-rush gap ran the other way: Kansas City sacked Bo Nix four times and Denver got to Mahomes twice, per ESPN's box score. A Kansas City line playing without its starting left tackle allowed those two sacks and blocked for 220 rushing yards, 173 of them from Kenneth Walker III in his first game as a Chief. Mahomes finished the opening drive himself with a 15-yard touchdown run, nine months to the day after the injury, then threw for 184 yards and two more scores. Denver finished with 176 yards of offense. The third argument, the total, is the one that held: 41 points, under the over 43.5 rung the market had at a coin flip.
The Objection That Held Up
Written before the game.
Reading each other moved the panel toward the market, not away from it: the seven finished between 47.9% and 52.8% on the Chiefs. Opus finished at the top of that range and was the only one to answer the Denver case head-on.
Held my center at KC +1.0 rather than moving to the group's slight Denver lean … The group's Denver case rests almost entirely on one number — 68 sacks vs 35 — and nobody prices the other side of the same trade: Denver's interior line is arguably in worse shape than Kansas City's (Deiter on IR and Wattenberg questionable means BOTH centers are compromised, plus Gargiulo out with an ACL), and Jonathon Cooper is Out, which trims the 2025 sack figure that is doing all the work. I also think "not cleared for game action" 12 days out is close to the modal state for a player who has practiced every camp day with the ones — I put ~90% on Mahomes starting, not the 85% several used … — Claude Opus
Since then Denver's reports listed no offensive lineman, so the two-centers half of the objection has faded; the Cooper half stands. Jonathon Cooper is on the Commissioner's Exempt List and cannot practice or play while he is on it, and one of the players who built the 68-sack season is out of this one. Even the one that discounted the sack gap hardest finished on Denver's side of the price.
What happened.
The objection held up better than the panel's middle number did. Opus finished at 52.8% on the Chiefs, the closest of the seven on the winner and still under the market's 55.5¢. Mahomes started, and the half of the objection Monday backed up was the sack number it distrusted: four on Nix, two on Mahomes.
The Last Day Leaned Denver, And Was Wrong
Final Week 1 designations came out Saturday, September 12. Kansas City ruled out Josh Simmons, and Patrick Mahomes was a full participant all three days with no game designation, nine months after the torn ACL and LCL. Denver's report listed one player, a full participant, and the team said all 53 were expected to be available.
Then the last day of trading leaned Denver's way. By 8 p.m. ET Monday, with kickoff at 8:16, the Chiefs had slipped from 55.5¢ to 53.5¢, Chiefs by 3 or more from 49.5¢ to 48.5¢, Broncos by 3 or more had risen from 40¢ to 41.5¢, and over 43.5 points had dropped from 49.5¢ to 46.5¢. Every one of those moves was toward the panel's number, and three of the four were wrong by the end of the night; only the total was right. Graded at those 8 p.m. prices instead of the September 13 prices, the market's miss would be a little bigger on the first three rows and a little smaller on the total, and the same side would be closer on all four.
The panel's coin flip described the game for one quarter. At 7-7 in the second quarter the Chiefs traded at 50¢, within a cent of the panel's 50.8%; Walker's 60-yard run early in the third quarter made it 89¢, and the touchdown that made it 31-10 made it 99¢.
My Take
Written before the game.
Kansas City by three or more is 49.5¢. A Yes contract at 50 cents pays $1 if the Chiefs win by a field goal or more, and Kalshi's fee at that price is 2 cents a contract, so it has to settle Yes more than 52% of the time to break even; the panel's number is 43.7%, eight points short of that bar. Denver by three or more at 40 cents breaks even at 42%; the panel's number is 43.8%, under two points over it. Same question, two sides, and the panel clears one bar by less than two points and misses the other by eight. That is a reading of the board, not a trade: the panel is wrong on roughly one call in seven, and a two-point gap on a coin-flip rung is inside that error. It gets graded Monday night either way.
What happened.
Kansas City won by 21, so Chiefs by 3 or more paid $1 on a 49.5¢ price and Broncos by 3 or more paid nothing on 40¢. The panel had the two sides a tenth of a point apart, the market had them nine and a half points apart, and the market's gap pointed the right way. On this one row the market's squared miss was 0.255 and the panel's 0.317. My reading, that the Denver side cleared its break-even bar and the Chiefs side missed it by eight points, was wrong on the side that mattered. I said then that a two-point gap on a coin-flip rung sits inside the panel's error, and one game does not settle who reads a field-goal rung better, but this one goes on the scoreboard as a miss.
Every Line
Market is Kalshi's September 13, 11:45 a.m. ET price, Our AI is the middle number of the seven models, Gap is the panel minus the market, and Settled is how Kalshi resolved each contract on the 31-10 final.
| Question | Market | Our AI | Gap | Settled |
|---|---|---|---|---|
| Chiefs Win The Game | 55.5¢ | 50.8% | −4.7 | Yes |
| Broncos Win The Game | 44.5¢ | 48.9% | +4.4 | No |
| Chiefs Win By 2 Or More | 53¢ | 47.0% | −6.0 | Yes |
| Chiefs Win By 3 Or More | 49.5¢ | 43.7% | −5.8 | Yes |
| Chiefs Win By 4 Or More | 40.5¢ | 36.9% | −3.6 | Yes |
| Chiefs Win By 5 Or More | 38¢ | 34.5% | −3.5 | Yes |
| Chiefs Win By 6 Or More | 37.5¢ | 32.3% | −5.2 | Yes |
| Chiefs Win By 7 Or More | 34.5¢ | 29.1% | −5.4 | Yes |
| Chiefs Win By 8 Or More | 29.5¢ | 25.4% | −4.1 | Yes |
| Chiefs Win By 10 Or More | 24¢ | 22.3% | −1.7 | Yes |
| Chiefs Win By 11 Or More | 22.5¢ | 20.0% | −2.5 | Yes |
| Chiefs Win By 14 Or More | 16.5¢ | 16.8% | +0.3 | Yes |
| Chiefs Win By 15 Or More | 14¢ | 14.8% | +0.8 | Yes |
| Chiefs Win By 17 Or More | 11.5¢ | 13.0% | +1.5 | Yes |
| Chiefs Win By 18 Or More | 10¢ | 11.2% | +1.2 | Yes |
| Chiefs Win By 21 Or More | 6.5¢ | 8.5% | +2.0 | Yes |
| Broncos Win By 2 Or More | 41¢ | 46.5% | +5.5 | No |
| Broncos Win By 3 Or More | 40¢ | 43.8% | +3.8 | No |
| Broncos Win By 4 Or More | 31.5¢ | 36.6% | +5.1 | No |
| Broncos Win By 5 Or More | 29¢ | 34.1% | +5.1 | No |
| Broncos Win By 6 Or More | 27.5¢ | 31.9% | +4.4 | No |
| Broncos Win By 7 Or More | 24.5¢ | 28.5% | +4.0 | No |
| Broncos Win By 8 Or More | 20¢ | 24.7% | +4.7 | No |
| Broncos Win By 10 Or More | 17.5¢ | 21.7% | +4.2 | No |
| Broncos Win By 11 Or More | 13.5¢ | 19.5% | +6.0 | No |
| Broncos Win By 14 Or More | 10.5¢ | 16.4% | +5.9 | No |
| Broncos Win By 15 Or More | 8¢ | 14.5% | +6.5 | No |
| Over 21.5 Total Points | 96.5¢ | 95.0% | −1.5 | Yes |
| Over 24.5 Total Points | 93.5¢ | 91.3% | −2.2 | Yes |
| Over 27.5 Total Points | 89.5¢ | 86.7% | −2.8 | Yes |
| Over 30.5 Total Points | 85.5¢ | 80.9% | −4.6 | Yes |
| Over 33.5 Total Points | 78¢ | 73.5% | −4.5 | Yes |
| Over 36.5 Total Points | 71.5¢ | 65.4% | −6.1 | Yes |
| Over 39.5 Total Points | 62.5¢ | 56.3% | −6.2 | Yes |
| Over 40.5 Total Points | 58.5¢ | 53.0% | −5.5 | Yes |
| Over 41.5 Total Points | 56.5¢ | 50.0% | −6.5 | No |
| Over 42.5 Total Points | 54¢ | 46.8% | −7.2 | No |
| Over 43.5 Total Points | 49.5¢ | 43.7% | −5.8 | No |
| Over 44.5 Total Points | 45.5¢ | 40.6% | −4.9 | No |
| Over 45.5 Total Points | 42.5¢ | 37.6% | −4.9 | No |
| Over 48.5 Total Points | 35.5¢ | 28.9% | −6.6 | No |
| Over 51.5 Total Points | 26.5¢ | 21.5% | −5.0 | No |
| Over 54.5 Total Points | 21¢ | 16.0% | −5.0 | No |
| Over 57.5 Total Points | 14.5¢ | 11.0% | −3.5 | No |
| Over 60.5 Total Points | 11.5¢ | 7.2% | −4.3 | No |
| Over 63.5 Total Points | 7.5¢ | 4.5% | −3.0 | No |
These numbers are model estimates, not predictions of fact and not financial advice. Event contracts involve risk, you can lose money trading them, and trading fees apply.
Every model on this panel is graded against real market settlements — records to date: Claude Fable 86% on 4,489 graded calls · Claude Opus 86% on 4,673 graded calls · Claude Sonnet 85% on 4,649 graded calls · GPT 85% on 11,590 graded calls · Gemini 86% on 10,833 graded calls · Grok 84% on 8,868 graded calls · Kimi 85% on 5,849 graded calls. Recomputed daily; the full scoreboard is public.
Each of the seven models got the same September 2 fact sheet, with no prices, no spread and no total, priced the final margin and the total, derived all 46 lines from those two, and could revise once after reading the others' anonymous first answers.
What Changes On The Next Board
Kansas City was a modest favorite because its quarterback was probably fine, and he played like it. The panel's Denver case went wrong on the records and on the matchup, and the one part that held was the scoring: 41 points, half a point under the rung it had at 50.0%. That is one game, and it points the same way as the Patriots-Seahawks opener, where the market was better on who won and by how much and the panel was closer on all nineteen totals. Two games is not a rule. It is enough to change how I read the next board: when the panel leans toward an underdog on the margin ladder I want a reason the market does not already have, and a sack total from last season was not one; when every one of its total rungs sits under the market, that is the first thing I look at. The side I took before the game, and the case against it, is on our Broncos vs. Chiefs Week 1 picks page.
More on this: NFL 2026 on Kalshi: 49 Live Boards, 10 Days To Kickoff · Broncos Vs Chiefs TD Props: 3 Mispriced Kalshi Plays For MNF · Broncos vs Chiefs Odds: Everybody's On Denver · Broncos vs Chiefs Picks: Mahomes Is Back, Nine Months To The Day · Colts vs Chiefs Picks: Kansas City Is the Trap of the Week
