One Year After Official Launch: ChatBIM 'ACIMUS' Evolves to Next-Gen LiteBIM — Introducing 'ACIMUS KIWARI,' an Architectural Design AI That Bulk-Generates BIM Model Proposals via Pilot Verification Program

Architectural Design AI 'ACIMUS KIWARI' That Bulk-Generates BIM Model Proposals from Text, Images, Volumes, Drawings, and Existing Models

ACIMUS Inc. (Headquarters: Chiyoda City, Tokyo; CEO: Mitsuaki Kikuchi) has developed 'ACIMUS KIWARI (Akimus KIWARI),' an architectural design AI that bulk-generates BIM model proposals—serving as a starting point for design exploration—from inputs such as text, images, building volumes, 2D drawings, and existing BIM/3D models. The company is now launching a pilot verification program, inviting participation from industry experts under the condition of professional review.

ACIMUS KIWARI represents the next evolution of the LiteBIM platform introduced with ChatBIM 'ACIMUS.' By using text-based conditions, reference images, building volumes, 2D drawings, or existing BIM/3D models as inputs, the AI generates editable BIM model proposals directly within the ACIMUS platform. These proposals are then reviewed and refined by architects, structural engineers, MEP engineers, and other specialists to support the '0 to 1' phase of planning, basic programming, and early-stage schematic design.

ACIMUS officially launched 'ChatBIM ACIMUS' on June 12, 2025—a service enabling BIM model creation through conversational interaction with generative AI. Just one year after its official release, the company is advancing from conversational BIM modeling to bulk-generating BIM proposals by providing AI with comprehensive design conditions.

By combining the rapidly evolving foundation models of generative AI with the AI-native LiteBIM infrastructure ACIMUS has built, the company now sees the potential to automatically generate BIM model proposals of sufficient quality to serve as a starting point for design discussions. This marks a pivotal shift: AI in architectural design is moving beyond mere image and rendering generation to directly producing BIM model proposals.

Demonstration of ACIMUS KIWARI (Text-to-BIM): Illustrating the workflow where input conditions are used by ACIMUS KIWARI to generate initial BIM model proposals, which are then reviewed within the ACIMUS platform.

However, ACIMUS KIWARI does not aim to replace the architect’s judgment. Instead, it is designed to test the feasibility and operational boundaries of AI use under the premise that experts will review, correct, and take responsibility for the generated models. Therefore, rather than a public release, the program begins as a pilot verification initiative with clearly defined application scopes. Companies in the architecture sector interested in participating are encouraged to contact ACIMUS.

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The Era of Generative AI Bulk-Generating BIM Model Proposals Is Upon Us

ChatBIM ACIMUS is an AI-native LiteBIM cloud service equipped with rich architectural element libraries, enabling 3D/BIM model creation and editing through conversational AI, as well as AI-generated architectural renderings.

One year ago, ACIMUS aimed to enable BIM model creation through conversational AI. Now, with ACIMUS KIWARI, the company is exploring a new possibility: combining cutting-edge generative AI technologies with its proprietary AI-native LiteBIM foundation to bulk-generate viable BIM model proposals from architectural design conditions.

This is not merely a feature addition. From the outset, ACIMUS has defined BIM models with structures optimized for AI processing, developing an AI-native architectural design platform built for conversational interaction with generative AI.

As a result, the company is approaching the capability to bulk-generate BIM model proposals of a certain standard—from site layout and floor configurations to structural grids, fixtures, exterior elements, and MEP spaces—using inputs such as text, images, volumes, drawings, and existing models.

Generative AI is evolving rapidly, month by month. In architecture, AI is no longer limited to image and rendering generation but is beginning to handle the creation of BIM model proposals themselves as starting points for design exploration. ACIMUS believes that the emergence of numerous architectural AI tools—both domestically and internationally—that will transform design workflows is not a distant future, but an imminent reality.

Precisely for this reason, ACIMUS is not rushing toward a public release, but instead launching this as a pilot verification program with clearly defined application scopes.

What Is ACIMUS KIWARI?

Symbol of ACIMUS KIWARI: A geometric pattern inspired by traditional Japanese architectural 'Kiwari' (wooden dimensioning system) embedded within a cube symbolizing BIM models, representing the AI’s ability to 'derive' architectural forms from design conditions.

ACIMUS KIWARI is an architectural design AI that bulk-generates editable BIM model proposals from inputs such as text, images, volumes, drawings, and existing models, with expert review as a prerequisite.

The symbol draws inspiration from 'Kiwari,' the traditional Japanese system that governs dimensional harmony and proportion in wooden structures.

'KIWARI' takes its name from the Japanese architectural concept of 'Kiwari'—a system where dimensions and proportions of all components are derived from column spacing and thickness, establishing overall architectural order. ACIMUS KIWARI overlays this philosophy onto the generative AI era: rather than having AI finalize complete designs, it 'derives' architectural forms from site conditions, usage, scale, program requirements, reference data, volumes, drawings, and existing models. This is the meaning embedded in its name.

ACIMUS KIWARI enables generative AI to bulk-produce BIM model proposals that include architectural elements. The key verification focus is whether these generated models possess the quality and structural integrity to withstand real-world review, correction, and editing by professionals.

Currently, the system does not generate or guarantee complete models for permit applications or construction documentation using AI alone. However, with continued advancements in generative AI and BIM data structuring, there is potential for future development toward higher-fidelity BIM generation and design proposals with densities closer to practical design workflows.

ACIMUS KIWARI aims to verify these possibilities under the conditions of expert review and clearly defined application scopes.

Supporting the '0 to 1' Phase of Early-Stage Design with LiteBIM

Basic workflow of ACIMUS KIWARI: Input → AI generates multiple BIM model proposals → Experts review and refine.

What ACIMUS emphasizes with 'LiteBIM' is not completing architectural design solely with AI. In architectural design, areas such as legal liability, structural safety, evacuation and fire protection, constructability, and client intent ultimately require human experts to make responsible judgments.

Therefore, ACIMUS does not aim to generate complete models for permit applications or construction documentation using AI alone. Instead, it is developing LiteBIM as a support tool for the '0 to 1' phase—planning, basic programming, and early schematic design—that precedes these final stages.

ACIMUS’s role is to support comparative evaluation of multiple design options, rapid prototyping of initial models, and consensus-building among stakeholders during the fluid early stages of design.

ACIMUS KIWARI inherits this philosophy. The BIM model proposals generated by AI are not final models for permit or construction use, but rather conceptual BIM proposals intended for review by architects, structural engineers, MEP engineers, and other specialists—used for design exploration, option comparison, and internal/external alignment.