Polimill · Public AI infrastructure in Japan

B Evidence level

Polimill: Public AI Infrastructure in Japan

Publisher: OpenAI · Vendors ' official customer information · Summary page or multiple case reports

Claim origin: Public disclosure by manufacturer or customer · Independent verification: No · Accessed: 2026-09-19

Evidence level measures whether a source can be located and reviewed; it does not mean vendor-reported claims were independently audited.

Standard case | Useful reference with remaining gaps 7 / 12

Business context1 / 2

Transformation workflow / 2

Technical workflow2 / 2

Human roles & governance1 / 2

Measured outcomes2 / 2

Source traceability1 / 2

Remaining gaps: Business context, Transformation workflow, Human roles & governance, Source traceability

The key to this case is not the single-point use of AI, but the re-establishment of “Japan's public AI infrastructure” as an enforceable, verifiable production stream with boundaries of human responsibility.

Business problem

Local governments need to share expert experience while meeting public sector governance and sustainable operations.

Solution

Accompanied by OpenAI to build public AI infrastructure and knowledge capacity for reuse.

Technical architecture & production workflow

Step 01

SOP / History Case / Expert Interview

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Step 02

Document Parsing, Cutting and Metadata Tags

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Step 03

Embedding / semantic index

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Step 04

Retrieving similar cases and rules based on current questions

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Step 05

LLM is evidence-based advice and attachment

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Step 06

• Rewrite the knowledge base of the new experience

Key technology & infrastructure components

Knowledge base/RAGEmbedding/vector searchPermissions and metadataLLMExpert review

Human roles & accountability

Government staff and experts are responsible for policy, facts and final decision-making.

FDE delivery actions

"When will the staff come to see the teacher?"
Interviews with experts to convert tacit judgment into searchable cases and rules
Design knowledge particles, labels, versions and privileges instead of simply uploading documents
Recall rate/Application of answers using real questions
Keep feeding back feedback, wrong answers and new cases.

Reusable delivery patterns

HF, high-cost, verifiable narrow-flow selection
Steps that can be validated with a certainty tool to prevent model self-assessment
Retain manual responsibility for high-risk actions
For each manual amendment to follow-up searchable context/rules

Business outcomes & delivery results

In August 2026, the case was made public; the focus was on transforming the tacit knowledge of experts into a cross-autonomous reusable asset.

Evidence boundaries & verification notes

Public information confirming business processes; technical components are abstract architecture based on public description
The current link is the official aggregation entrance, and a deep link or page number that directly locates the case has yet to be added.

Primary source: Polimill: Public AI Infrastructure in Japan ↗