37.6%
Win Accuracy
Win rate of the top SI Index pickSprint Paddock
AI horse-racing predictions powered by the SI Index, with handy tools for racing fans. Our proprietary AI quantifies each horse's ability as the SI Index — clear predictions to support your own handicapping.
69.5%
Place Accuracy
Place rate of the top SI Index pick70.7%
Top 3%
Rate at which the winner was among our top 3 SI Index picksLatest News
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★ Featured
新指数「SI2」「SI Max」とは？— 全43万レース検証で“最も当たるAI”へ
Sprint Paddockの予想AIが進化。従来のSI Indexに、馬の近走フォームや条件適性を加えた「SI2」、さらに前走の馬体重・上がり・調教師成績などを取り込んだ「SI Max」を新たに公開しました。全43万レースの検証で、単勝的中率はSI 36.4%→SI2 36.9%→SI Max 37.6%、勝ち馬をAI上位3頭に入れる確率は70.7%まで向上。3指数の違いと使い分けを解説します。
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★ Featured
無料アカウント登録でAI競馬予想をフル活用しよう
アカウントを無料登録するだけで、SI Index予想やレース分析、チケットトラッカーなどSprintAIの主要なAI機能がご利用いただけます。
Read more →先週末のAI予想を全72レース検証｜複勝60%も重賞は“勝ち切れず”、新指数SI2・SI Maxはどう補うか（2026年9月5・6日）
先週末（9/5-6）のJRA全72レースでSI Indexを検証。複勝的中率は59.7%と堅実で、重賞・オープン特別7鞍でも6鞍で本命が馬券圏内（2〜3着）。一方で単勝は25.0%、重賞は勝ち星ゼロと「堅実だが勝ち切れない」課題も。この壁に、前走内容や馬体データを加えた新指数SI2・SI Maxが長期でどう応えているかを、実データで解説します。
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25.0%
Win Rate
Race Results
2026-09-06
Hanshin · Nakayama · Sapporo
36 races
Win 25.0%
Place 55.6%
25.0%
Win Rate
Race Results
2026-09-05
Hanshin · Nakayama · Sapporo
36 races
Win 25.0%
Place 61.1%
先週末のAI予想を全72レース検証｜新潟記念・中京2歳Sとも本命が3着、重賞“本命3着”は3週連続（2026年8月29・30日）
先週末（8/29-30）のJRA全72レースでAI予想（SI Index）を検証。複勝40.3%・単勝22.2%と夏らしい難解な数字に。新潟記念（G3）・中京2歳Sはいずれも本命が3着で、重賞の「本命3着」は3週連続。混戦の重賞で複勝・ワイドが有効だった理由を、実際のレース内容から数字で掘り下げます。
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19.4%
Win Rate
Race Results
2026-08-30
Chukyo · Niigata · Sapporo
36 races
Win 19.4%
Place 41.7%
25.0%
Win Rate
Race Results
2026-08-29
Chukyo · Niigata · Sapporo
36 races
Win 25.0%
Place 38.9%
先週末のAI予想を全72レース検証｜「堅実に来るが勝ち切れない」新潟2歳S・キーンランドCとも本命3着（2026年8月22・23日）
先週末（8/22-23）のJRA全72レースでAI予想を検証。複勝的中率は54.2%と堅実な一方、条件戦以上の単勝は14.3%。新潟2歳S・キーンランドC（G3）はいずれも本命が3着で、混戦の重賞は「複勝・ワイド」が有効だった理由を深掘りします。
Read more →先週末のAI予想を全72レース検証｜札幌記念の取りこぼしと“本命1点の落とし穴”（2026年8月15・16日）
先週末（8/15-16）のJRA全72レースでAI予想を検証。単勝的中率は新馬・未勝利を除くと26.5%、勝ち馬は半数のレースで“予想上位2頭”に。札幌記念（G2）の取りこぼしと中京記念（G3）的中の明暗を深掘りします。
Read more →AI-powered JRA horse racing predictions
Sprint Paddock is an AI horse racing prediction service for the Japan Racing Association (JRA). Every race day we publish clear win probabilities and a single top pick for each race, so you can compare our model's view against the odds and your own handicapping. All predictions are powered by our proprietary SI Index model and are provided as decision support - never a guarantee.
What is the SI Index?
The SI Index (Sprint Intelligence Index) rates every horse's ability on a single scale built from its full race history and recent form. A higher SI Index means stronger expected competitiveness under similar conditions. We convert those ratings into win and place probabilities for each runner, then rank the field so you can see the top pick at a glance.
SI, SI2 and SI Max explained
SI is our base index. SI2 builds on it by adding each horse's recent form and how well the distance, surface and course suit it. SI Max goes further, folding in race-day details such as previous-race body weight, closing time, running style, and jockey and trainer form. Across roughly 430,000 validated races, win accuracy rises from 36.4% with SI to 37.6% with SI Max, and the winner lands in our top three picks about 70% of the time.
Win rate, place rate and race results you can check
We track how our top SI Index pick performs and publish the numbers openly: win rate, place rate, and how often the winner appears in our top three. After each race day we post a results report and regular weekend reviews so you can see where the model was strong and where it missed. Browse horses, jockeys and past races to explore the data behind every prediction.
Start with today's AI predictions
See the latest JRA race previews and SI Index win probabilities on the predictions page, read the newest race results and reviews in our news section, or create a free account to unlock every feature. See AI predictions