Specialist shops often present two labels that appear very close: Wagyu A4 and Wagyu A5. Because 5 is the highest number in Japan’s grading system, it is tempting to assume A5 is simply “better” and A4 is an inferior version. A5 is objectively the higher grade, but the practical difference should be understood through grading, marbling and eating profile rather than as an obligation to prefer the larger number.

Some diners deliberately choose A4 because they want abundant marbling without pushing richness to its most extreme expression. Others specifically want the intensity associated with A5.

What the A means

In Japan’s system, A, B and C describe estimated carcass yield. A indicates yield above the standard, B standard yield and C below standard. A4 and A5 therefore share the same yield grade; the difference is their quality number.

Quality grade 4 versus quality grade 5

Quality is assessed from 1 to 5 using four areas: marbling; meat colour and brightness; firmness and texture; and fat colour, lustre and quality. The final quality grade is determined by the lowest of those four assessments.

An A5 carcass therefore reaches final quality grade 5, while A4 reaches grade 4. A photograph of marbling alone cannot establish the entire grade.

The most visible difference: BMS 5-7 versus BMS 8-12

For marbling, the Japan Meat Grading Association places BMS 5, 6 and 7 within quality grade 4, while BMS 8 through 12 fall within grade 5. This is why A5 is generally associated with more abundant marbling.

But BMS is only one component, and there is substantial variation inside each band. BMS 8 and BMS 12 both sit within grade 5 marbling while looking quite different.

What A5 typically feels like

A5 is famous for an extremely rich, melting texture, particularly at the upper end of the BMS range. Fine intramuscular fat melts rapidly as the meat cooks, creating a silky and persistent mouthfeel.

This also explains why serving sizes are often smaller than for conventional beef.

What A4 typically feels like

A4 remains a very high grade. It can show abundant marbling and exceptional juiciness, but often offers a different balance between fat and muscle from extreme A5.

For diners who want to perceive more fibre and beef character while keeping the Wagyu richness, A4 can be especially attractive.

Is A5 always more tender?

Not for every possible piece. Marbling contributes strongly to tenderness perception, but anatomical cut matters too. A4 tenderloin may be naturally very tender, while another A5 muscle has a different structure.

Does A5 always taste better?

The grading system is not a preference survey. A5 meets higher objective grading criteria, but personal enjoyment remains subjective. As marbling rises, fat plays a larger sensory role.

How serving size may differ

There is no mandatory A4 or A5 portion, but very high marbling often supports smaller servings. Highly marbled A5 may work well around 70-120 grams per person depending on the menu, while some A4 cuts may feel comfortable in a larger portion.

Is A5 always much more expensive?

A5 often commands a premium, but there is no fixed percentage difference. Regional origin, cut, BMS, weight, scarcity, certification, importer and sales format also affect price.

A4 vs A5 for a first experience

If you have never tried Japanese Wagyu and want to understand A5’s reputation, a small, well-documented A5 portion can be memorable. You do not need to begin at BMS 12.

If very fatty beef tends to overwhelm you, A4 may be a more balanced starting point.

A4 vs A5 for a full meal

A5 can be ideal in small portions within a multi-course menu. If the beef needs to occupy more of the plate, A4 may provide a muscle-to-fat balance that some diners find easier in greater quantity.

What about A4 BMS 7 versus A5 BMS 8?

These scores sit immediately on either side of the marbling boundary between grades 4 and 5. The difference may feel less dramatic than comparing BMS 5 with BMS 12. The final quality grade also includes the other quality criteria.

How to choose between A4 and A5

Ask four questions: do I want maximum marbling impact? Do I prefer a meatier balance? Is this a tasting or main course? Which cut am I buying? Then review origin, traceability, BMS, weight and price.

The conclusion

A5 sits above A4 in Japan’s objective grading system. That does not mean every diner must prefer it. A4 and A5 can support different eating experiences, while cut and BMS add essential detail.

Frequently asked questions

What BMS corresponds to A4?

For the official marbling criterion, BMS 5 to 7 corresponds to quality grade 4.

What BMS corresponds to A5?

BMS 8 to 12 corresponds to quality grade 5 marbling.

Does A4 have little marbling?

No. It can be heavily marbled; it simply falls below the grade 5 marbling band.

Which should I buy first?

A5 suits someone seeking the most intense expression, while A4 may be more balanced for diners who prefer a greater sense of lean meat.

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