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JapanConstruction and engineering2024 – ongoing

Dai-Dan

In-house generative AI chat with search over internal regulations and technical documents

Dai-Dan raised answer accuracy on chart-heavy documents to 80% with an annotation tool

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Problem

Dai-Dan's generative AI chat answered poorly on documents full of charts and tables. Uploading files by hand took about 15 minutes per task.

Approach

Dai-Dan, an engineering firm for air conditioning, electrical and IT infrastructure, ran a generative AI chat on Azure OpenAI with retrieval over internal regulations and technical documents. It added SoftBank's TASUKI Annotation tool to structure documents in-house. The tool also automated downloading, processing and uploading files.

Results

80%answer accuracy on documents with charts and tables after the change, per SoftBankVendor case study[1]
15分manual time per upload task before automationVendor case study[1]

Takeaway

Dai-Dan's accuracy problem came from document structure, and a data preparation tool addressed it.

Categories

Innovation type
Process innovation
AI technology
Generative AI
Evidence
Vendor case study

Sources

Source summaries

[1]SoftBankOct 2025

SoftBank's customer story on Dai-Dan's internal generative AI system. It reports accuracy rising to 80% on figure-heavy documents and the removal of a 15-minute manual upload step.

Full details are in the original sources.

Added 2 Nov 2026 · Updated 2 Nov 2026
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