Class-leading

adj.capable, hopefulprofessional

What it means

Performing better or more effectively than comparable options in its category.

Reach for it when making a category-specific superiority claim backed by a stated measure

The class-leading filter removed the most particles per watt in the independent trial.

everyday
top-performing
measured performance ranks near or at the top
not when Top-performing may describe several leaders rather than the single best option.
professional
best-in-class
business language needs an explicit category leader
not when Best-in-class is promotional jargon and requires defensible comparison data.
professional
market-leading
commercial leadership or adoption is the actual claim
not when Market leadership can mean sales share, not superior product performance.
formal
category-leading
the comparison category should remain visible
not when Category-leading sounds manufactured and still requires a named metric.
literary
benchmark-setting
the result establishes a standard others try to match
not when Setting a benchmark is stronger than merely leading current competitors.

class-leading performance
Class-leading performance was demonstrated on the same test used for every model.
class-leading efficiency
The motor achieved class-leading efficiency at ordinary operating loads.
class-leading design
A class-leading design claim means little without naming the comparison.

Wiktionary records the adjective directly. Any live class-leading claim still needs a named class, metric, date, and comparison source.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.