What's the difference between OR, RPR and Timeform ratings?

OR (Official Rating) is the BHA handicapper's mark. RPR (Racing Post Rating) is Racing Post's private rating of best recent performance. Timeform Rating is a similar performance rating from Timeform with their own assessment of how well the race was run. ratethat.horse's AI rating uses a machine-learning ranking model trained on five years of historical results to predict relative chance in today's race, given conditions.

Why does the same horse have different ratings on different sites?

Each ratings provider weights race performance differently. OR adjusts only after handicapper review. RPR and Timeform update after each performance. Private AI ratings can update intra-day. Differences between providers often highlight a horse where opinions diverge — frequently a value spot.

Horse racing ratings explained

Q: How accurate are AI horse racing predictions?

Accuracy depends entirely on baseline. The strongest single feature is OR itself — beating it requires combining many weaker signals well. ratethat.horse publishes live performance at /historic-performance. As a benchmark, beating the market favourite long-term in horse racing is extremely difficult — but small persistent edges in specific slices (e.g. sprint handicaps, small fields) compound over time.

Every horse racing site shows a rating beside each runner. Knowing what each one means — and how they differ — is the foundation of reading form.

What is an Official Rating (OR)?

An Official Rating is a handicap mark, assigned by the BHA in Britain and HRI in Ireland. It represents the horse's assessed ability in pounds. Handicap races assign weight based on OR — a horse rated 100 carries 9 lb more than a horse rated 91. Higher OR = better-rated horse.

OR vs RPR vs Timeform

OR is the official handicapper's mark and changes slowly. RPR (Racing Post Rating) is Racing Post's own assessment, updated after every run. Timeform Rating uses their proprietary methodology and adjusts for how the race was run.

None is "correct" — they're different lenses on the same horses. Big disagreements between them often flag horses worth a closer look.

The ratethat.horse AI rating

ratethat.horse trains a LightGBM ranking model on five years of historical UK and Irish runs — 391,000+ data points. The model learns how to weight dozens of features (OR, recent form, going, distance, trainer/jockey form, course form, class moves and more) and outputs a calibrated probability for each runner. Race-by-race performance is published at /historic-performance.

Frequently asked

What is a horse racing official rating (OR)?

An Official Rating (OR) is a handicap mark assigned by the BHA or HRI. Higher OR = better-rated horse. UK ratings typically range from 0 to 140+ on the flat, up to around 180 for elite jumpers.

What's the difference between OR, RPR and Timeform?

OR is the official handicapper's mark. RPR is Racing Post's private rating. Timeform has its own methodology. ratethat.horse adds an AI rating trained on historical results.

How does ratethat.horse's AI rating work?

A LightGBM ranking model trained on five years of UK & Irish runs predicts relative chance per race. Variants exist for sprint, handicap and small-field races.

How accurate are AI horse racing predictions?

Beating the market favourite long-term is extremely difficult. ratethat.horse publishes live model performance at /historic-performance for full transparency.