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JapanFinance and insurance2024 – ongoing

Aozora Bank

On-premises Aozora LLM trained on internal data for questions on internal rules

Aozora Bank and neoAI trained an on-premises LLM on internal data and reported 130% of the earlier accuracy

In progressCompany's own claim

Problem

Aozora Bank wanted a model that understood its internal terms and clerical rules for corporate and retail banking. Cloud API models did not meet its data security requirements.

Approach

Aozora Bank and neoAI built an on-premises platform on an open-source LLM. They continued its pretraining on the bank's internal data. The model was provisionally named Aozora LLM. It was tested on an internal benchmark that asks questions about clerical rules and uses retrieval over bank documents.

Results

130%accuracy on difficult questions in the bank's internal benchmark compared with the level before continued pretraining, as reported by the companiesCompany's own claim[1]

Takeaway

The result comes from a benchmark the two companies built themselves. The release names no production launch date.

Categories

Innovation type
Process innovation
AI technology
Generative AI
Evidence
Company's own claim

Sources

Source summaries

[1]ASCII.jp17 Apr 2025

A republished press release on the Aozora Bank and neoAI on-premises LLM. It reports 130% of the previous accuracy on an internal benchmark and describes gains in recognizing in-house terms and loan product structure. Next steps are further accuracy work and use in corporate banking.

Full details are in the original sources.

Added 2 Nov 2026 · Updated 2 Nov 2026
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