Understanding the Difference
| Factor | A5 (BMS 8-12) | A4 (BMS 5-7) |
|---|---|---|
| Marbling | Extreme — nearly white | Abundant — clear red/white pattern |
| Texture | Butter-soft, melts at body temp | Tender with more "bite" |
| Flavor | Rich, sweet, umami-dominant | Beefier, more balanced |
| Ideal Portion | 50-80g | 80-150g |
| Price (Ribeye FOB) | ¥18,000-25,000/kg | ¥10,000-15,000/kg |
| Best Use | Teppanyaki, sashimi, omakase | Steaks, yakiniku, sukiyaki |
When to Choose A5
- Ultra-premium positioning (omakase, Michelin-level)
- Small-portion, high-theater presentation
- Customers who expect the "best of the best"
- Gift/special occasion market
When to Choose A4
- Steak-focused restaurants wanting larger portions
- Yakiniku and BBQ concepts
- Markets where customers prefer "beefy" flavor
- Building a wagyu menu at accessible price points
The insider move: Many top restaurants in Japan serve A4 BMS 7 for their regular menu and reserve A5 BMS 10+ only for special courses. The difference between BMS 7 and BMS 8 is subtle — but the price jump is 30-40%.
Compare A5 and A4 Side by Side
Order our comparison sample pack — 2kg each of A5 and A4 ribeye from the same farm. See and taste the difference.
Order Comparison Pack →FAQ
Is A5 always better than A4?
Not necessarily. A5 is richer and more luxurious, but many people prefer the more balanced, "beefier" flavor of A4. For large portions (over 100g), A4 is often more enjoyable.
Can I taste the difference?
Between BMS 5 and BMS 10, absolutely. Between BMS 7 and BMS 8 (the A4/A5 borderline), the difference is subtle and most diners cannot distinguish them in a blind test.
Which sells better in restaurants?
A4 outsells A5 by volume in most markets because it allows larger portions at lower prices. A5 is the "hero item" that drives prestige but A4 generates the revenue.
Karen Hashimoto
Curator & Export Compliance Director · WAGYU NINJA
Karen sources directly from Japanese producers and handles export compliance for B2B buyers in 50+ countries. Based in Fukuoka, Japan. @konnichiwa.karen