MLB Rookie of the Year Odds: The Panel Fades Both Favorites
By Jake Hari
August 10, 2026
The Quick Answer
The MLB Rookie of the Year odds on Kalshi say both races are close to decided: JJ Wetherholt sits at 61.5¢ in the NL and Kevin McGonigle at 82¢ in the AL. Our seven-model AI panel read the same fetched season data and disagreed with the certainty, not the names. It makes the NL a near coin flip, Wetherholt 37.9% to Sal Stewart's 35.8%, and caps McGonigle at 55.7% with seven weeks still to play. Both full boards, every seat's number, and the exact triggers that would flip each race are below.
The Market
Kalshi lists 30 candidate contracts per league. The settlement rule is one sentence, quoted from the Sal Stewart contract: "If Sal Stewart wins the Pro Baseball National League Rookie of the Year in the 2026 season, then the market resolves to Yes." One winner per league, every other contract resolves No. The award itself is a season-end writers' vote, with results announced in November, and the markets carry an expected expiration of December 31, 2026.
Two timestamps: panel verdicts were generated the evening of August 9, 2026, price-blind; prices are live bid-ask midpoints fetched as of August 9, 2026. The NL board has traded about 2.2 million contracts and the AL board about 1.6 million, and several longshot contracts hold penny-wide books, so treat the small prices as approximations, not gospel.
The Board
The NL Board
| Outcome | 2026 Season Line | Kalshi | AI Blend (After Revision) |
|---|---|---|---|
| JJ Wetherholt (Cardinals) | .245/.350/.382, 16 HR | 61.5¢ | 37.9% |
| Sal Stewart (Reds) | .255/.332/.475, 25 HR | 28.5¢ | 35.8% |
| Nolan McLean (Mets) | 3.51 ERA, 130.2 IP, 156 K | 3¢ | 14.4% |
| T.J. Rumfield (Rockies) | .297/.374/.461, 13 HR | 2.5¢ | 3.8% |
| Carson Benge (Mets) | .272/.333/.413, 13 HR | 1.5¢ | 2.8% |
| Any Other Listed NL Rookie | n/a | n/a | 2.1% |
| Justin Crawford (Phillies) | .266/.316/.354, 2 HR | 0.5¢ | 1.3% |
| Any Unlisted NL Rookie | n/a | n/a | 1.3% |
| Rhett Lowder (Mets) | 5.26 ERA, 89.0 IP, 73 K | 0.5¢ | 0.5% |
| Zac Veen (Rockies) | in AAA | 0.5¢ | 0.2% |
The AL Board
| Outcome | 2026 Season Line | Kalshi | AI Blend (After Revision) |
|---|---|---|---|
| Kevin McGonigle (Tigers) | .287/.392/.431, 12 HR | 82¢ | 55.7% |
| Munetaka Murakami (White Sox) | .240/.372/.545, 26 HR | 13.5¢ | 17.8% |
| Parker Messick (Guardians) | 2.57 ERA, 136.2 IP, 136 K | 4.5¢ | 14.6% |
| Chase DeLauter (Guardians) | .279/.355/.436, 12 HR | 1.5¢ | 3.6% |
| Payton Tolle (Red Sox) | 3.20 ERA, 107.0 IP, 124 K | 0.5¢ | 2.8% |
| Kazuma Okamoto (Blue Jays) | .225/.297/.429, 24 HR | 1¢ | 2.1% |
| Any Other Listed AL Rookie | n/a | n/a | 1.5% |
| Any Unlisted AL Rookie | n/a | n/a | 1.0% |
| Carter Jensen (Royals) | .227/.303/.419, 16 HR | 0.5¢ | 0.6% |
| Colt Emerson (Mariners) | .200/.258/.352, 8 HR | 0.5¢ | 0.4% |
More live boards from the same panel: Heisman Trophy odds (CJ Carr 12.5¢) · College football title odds (Ohio State 12.5¢) · The full markets hub
JJ Wetherholt Vs. Sal Stewart: A Tied Vote Priced Like A Landslide
The market's 61.5¢ on Wetherholt is the board's flagship number, and the panel thinks it is roughly 24 points too rich. Not because Wetherholt is the wrong favorite: his case is the modern one, 4.4 bWAR built on the second-highest fielding run value among all MLB position players (+18), 95th-percentile baserunning, and a first-place-vote edge in MLB.com's August 5 expert poll. The problem is that the same 30-voter poll scored the race an exact 144-144 tie with Stewart, whose case is the traditional one: 25 home runs, 87 RBI, and a July in which he slugged .510. His 25th homer moved him past Joey Votto on Cincinnati's rookie list, with Frank Robinson's franchise rookie record the chase story down the stretch.
"Wetherholt's elite 4.4 bWAR, defense, and baserunning offset a modest .245 average, while Stewart's 25 HR and 87 RBI appeal to traditional voters. The August expert poll tie confirms this dead heat." (DeepSeek V4)
A dead heat at the ballot level and a 33-point spread at the market level cannot both be right. If the panel is right, Stewart at 28.5¢ is the single most mispriced contract on either board. And the quiet third wheel is real: Nolan McLean's 156 strikeouts over 130.2 workhorse innings earned him 14.4% from the blend against a 3¢ price, the kind of number that cashes if the two hitters split the vote and neither finishes loudly.
Kevin McGonigle: The Right Favorite At The Wrong Price
Nobody on the panel disputes that the Tigers' 21-year-old shortstop leads this race. A .287/.392/.431 line with 4.5 fWAR and a 136 wRC+ at a premium position is the exact profile recent electorates have rewarded, and his expert-poll lead grew from 120 points in June to 170 in August. The dispute is arithmetic: 82¢ implies this is finished, and the blend says 55.7% with roughly 45 games left.
"I sit above the panel median because the signal isn't just the lead, it's the direction (120 to 170 since June) plus a slump-proof profile: 4.5 fWAR, .393 OBP, everyday shortstop at 21. Front-runners whose leads widen at the 72% mark almost never get reversed." (Claude Opus)
The gap between 82 and 56 is the price of two live threats. Munetaka Murakami has hit 26 home runs in just 82 games with a .545 slug, and a finish near 40 homers is the one counting stat that historically moves median voters; the panel gives him 17.8% against a 13.5¢ price. Parker Messick is the bigger multiple: a 2.57 ERA and 1.04 WHIP over 136.2 innings earned him 14.6% from the blend against a 4.5¢ contract, the largest price-to-blend ratio on either board.
Where The Panel Changed Its Mind
After round one, each seat read the other six models' anonymized reasoning and could revise with a stated reason. The AL favorite is where the deliberation actually worked: round-one McGonigle numbers ranged from 44% to 63%, and the revision round squeezed that spread to 54-57.
"McGonigle has the best award shape, combining 4.5 fWAR, .393 OBP, shortstop value, age-21 narrative, and a widening expert-poll lead." (ChatGPT, which raised its McGonigle number from 44% to 56% after the round, the largest single move on the board)
"A 21-year-old everyday shortstop with 4.5 fWAR, 136 wRC+, and .393 OBP is exactly the Carroll/Henderson profile modern electorates reward." (Claude Fable, which came down from 63% to 56% in the same round)
The NL barely moved, and that is its own finding. Every seat entered the revision round calling Wetherholt-Stewart a two-point race, read six other rationales, and left it a two-point race.
"I lean him 37-35 because his 4.4 bWAR, +18 fielding runs, and elite baserunning are slump-resistant, while Stewart's case (25 HR, 87 RBI, hot July) depends on power sustaining for 45 more games." (Kimi K3, holding its round-one position)
Dark Horses The Panel Won't Dismiss
- T.J. Rumfield (Rockies, 2.5¢, blend 3.8%): a .297 average keeps him voter-visible, and several seats named the batting-title path as the one scenario where a Coors-discounted bat still forces its way onto ballots.
- Carson Benge (Mets, 1.5¢, blend 2.8%): 13 homers and 18 steals; one seat argued the balanced line plus the Mets spotlight "can become a balanced 20-20-ish story."
- Chase DeLauter (Guardians, 1.5¢, blend 3.6%): a .279/.355/.436 line built quietly over 101 games; multiple seats kept him alive as the compiler who benefits if the louder cases stumble.
- Payton Tolle (Red Sox, 0.5¢, blend 2.8%): a 3.20 ERA on a 64-52 contender; the panel's argument is that a big September in a playoff race amplifies a pitcher's narrative faster than any other setting.
What Would Change The Panel's Mind
- A McGonigle injury or extended slump. The one development nearly every seat named first; at 82¢, the market is carrying almost none of that risk.
- Stewart reaching 30-plus homers. Kimi's stated flip condition, and GLM sketched the same path to "32 HR/115 RBI, which would swing sentiment."
- Murakami sustaining a 40-homer pace. The games-played deficit stops mattering if the season total gets loud enough.
- A Messick ERA-title run. A sub-2.40 finish forces the pitcher conversation into a race currently framed as hitter-versus-hitter, in either league.
Every Seat's Round-1 Number
The per-model split before the revision round. On a phone this table scrolls sideways; the boards above carry the headline numbers, which average all seven seats' revised round-two estimates. Seven of the panel's eight seats ran this board.
NL:
| Outcome | Claude Fable | Claude Opus | Claude Sonnet | ChatGPT (GPT-5.5) | Kimi K3 | GLM 5.2 | DeepSeek V4 |
|---|---|---|---|---|---|---|---|
| JJ Wetherholt | 39% | 36% | 37% | 39% | 40% | 37% | 35% |
| Sal Stewart | 37% | 38% | 36% | 36% | 36% | 34% | 35% |
| Nolan McLean | 14% | 16% | 15% | 15% | 15% | 12% | 15% |
| T.J. Rumfield | 4% | 4% | 3% | 4% | 2% | 5% | 6% |
| Carson Benge | 3% | 3% | 2% | 2% | 2% | 3% | 3% |
| Any Other Listed NL Rookie | 0.7% | 2% | 3% | 2% | 2% | 3% | 2% |
| Justin Crawford | 1% | 0.8% | 1% | 1% | 0.5% | 2% | 2% |
| Any Unlisted NL Rookie | 0.7% | 2% | 2% | 1% | 2% | 4% | 1% |
| Rhett Lowder | 0.4% | 0.2% | 0.5% | 0.3% | 0.2% | 0.3% | 1% |
| Zac Veen | 0.2% | 0.1% | 0.3% | 0.1% | 0.1% | 0.2% | 0.1% |
AL:
| Outcome | Claude Fable | Claude Opus | Claude Sonnet | ChatGPT (GPT-5.5) | Kimi K3 | GLM 5.2 | DeepSeek V4 |
|---|---|---|---|---|---|---|---|
| Kevin McGonigle | 63% | 58% | 62% | 44% | 50% | 52% | 50% |
| Munetaka Murakami | 15% | 20% | 14% | 22% | 20% | 20% | 20% |
| Parker Messick | 13% | 13% | 13% | 20% | 15% | 15% | 15% |
| Chase DeLauter | 2% | 3% | 2% | 6% | 3% | 3% | 5% |
| Payton Tolle | 2% | 2% | 3% | 2% | 3% | 2% | 3% |
| Kazuma Okamoto | 2% | 2% | 2% | 4% | 2% | 4% | 3% |
| Any Other Listed AL Rookie | 0.8% | 0.5% | 2% | 1% | 3% | 2% | 1% |
| Any Unlisted AL Rookie | 0.7% | 0.2% | 1% | 0.5% | 3% | 0.7% | 1% |
| Carter Jensen | 0.3% | 0.8% | 1% | 0.8% | 0.8% | 1% | 1% |
| Colt Emerson | 0.2% | 0.2% | 0.5% | 0.2% | 0.4% | 0.3% | 1% |
Every seat on this panel is graded against real market settlements — records to date: GPT 83% on 3,225 graded calls · Claude Fable 82% on 450 graded calls · Claude Opus 84% on 514 graded calls · Claude Sonnet 82% on 498 graded calls · GLM 81% on 2,307 graded calls · Kimi 83% on 2,285 graded calls · DeepSeek 80% on 2,332 graded calls. Recomputed daily; the full scoreboard is public.
Models are frequently wrong; the market price reflects real traders' money.*
Every number in this piece gets graded in public once the markets settle, alongside every other call the panel has made.
What A DFS Player Does With A Rookie Board
Award markets are playing-time markets wearing a trophy costume. An 82¢ McGonigle is the market asserting his everyday job and his September at-bats; a 61.5¢ Wetherholt price wobbling against a tied voter poll tells you his July slump is real enough to watch in daily pricing. When a rookie's award contract moves sharply, the cause is almost always a role change, a call-up, or a slump, and all three show up here days before salary systems adjust. Cross-check the assumption directly: run a slate through the Stokastic MLB Sims and see whether the playing-time picture the sims assume matches what the award market is pricing.
Settlement Timeline
- Late September 2026: regular season ends; both awards are decided by the season-end vote.
- November 2026: winners announced; contracts resolve Yes or No.
- December 31, 2026: listed market expiration on Kalshi.
- This page re-scores when the story moves; prices above are as of August 9, 2026.
The Bottom Line
The panel and the market agree on the names and disagree on the certainty, and that disagreement is the whole trade. If the writers' vote stays as tied as the writers themselves say it is, 28.5¢ on Sal Stewart is the value side of the NL board, and 82¢ on Kevin McGonigle is a fair favorite carrying an unfair price. The full markets hub keeps both boards' live prices in one place, and come November the scoreboard will say which side of this argument deserved your trust.
More on this: WNBA Rookie Of The Year 2026 Odds: Miles 99\u00a2, AI Panel Split · Fantasy Rookie Rankings 2026: The Market Is Selling The No. 1 Pick · MLB Best Record Odds 2026: Brewers vs. Dodgers on Kalshi · MLB Division Race Odds: Three AL Races Are Wide Open · Kalshi MLB Home Run Edge Board: Sims HR% Vs Market Price