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Osaki Model Numbers Explained: OS-Pro, Platinum, OS-3D and Ai

Osaki's naming is the most confusing in the category: the same chair can carry a series prefix, a sub-brand, a technology suffix and a number. Here is what each part signals, based on the specifications Osaki publishes for the models we have verified.

By ChairMentor Editorial Team · Research and editorial standards

Published 2026-09-01 · Last reviewed 2026-09-01

Researched from published manufacturer specifications and retailer documentation. Not a hands-on test. How we research.

The prefixes

OS- is simply Osaki's product prefix. It appears on chairs across every tier — OS-Champ at $1,299 street and OS-Pro Maestro 4D at $8,999 street both carry it. It tells you nothing about the chair.

OS-Pro marks the flagship series. On the models we have verified, OS-Pro chairs carry the 5-year limited warranty and the longer tracks.

Platinum is a premium sub-line rather than a technology label. Platinum Solis Duo 4D+ is a flagship, but the word itself does not guarantee a spec.

OS-3D states the roller type in the name (OS-3D Ai Vito). Useful when present, but its absence does not mean 2D — the Highpointe 4D and Maestro 4D put the D-rating at the end instead.

The suffixes: 4D, 4D+, Duo, Ai

4D means the rollers add variable speed and rhythm to 3D depth movement. This is the one part of the name that reliably maps to hardware.

The plus in 4D+ is Osaki's marketing for its newer 4D mechanism. Treat it as a generation marker, not as a fifth axis — there is no 5D.

Duo means two mechanisms. Ai Vivo (Duo) 4D+2D pairs a 4D back mechanism with a separate 2D unit; Platinum Solis Duo 4D+ uses the Duo naming in its own way, so check the spec table rather than the name.

Ai signals body-scan and detection software (OS-Ai Vera 4D+, OS-3D Ai Vito). It appears on a $1,999 chair and an $7,999 chair, so it is not a tier indicator.

The numbers

Four-digit numbers like 4000 in OS-4000XT are model-family identifiers carried over across generations, not price or spec codes. XT marks a revision of that family.

Named models (Maestro, Vera, Solis, Highpointe, Vivo, Vito, Champ, Dreamer) have largely replaced numbers on newer releases. A name tells you the family; the D-rating and the spec table tell you the chair.

How to read any Osaki name in ten seconds

Ignore OS-, Platinum and Ai. Find the D-rating: 2D, 3D or 4D. Then check three numbers on the spec sheet — track length in inches, maximum user weight, and wall clearance. Those three decide fit; the name decides nothing.

Then check the warranty line. Osaki runs two structures, and which one a chair gets is the clearest signal of where it really sits in the lineup.

Update log

This page is re-checked at least every six months, and sooner when a price, warranty term or specification changes.

  1. 2026-09-01Page reviewed against current manufacturer and retailer documentation.