JapanEducation2023 – ongoing

Nagase Brothers

English Writing Bootcamp graded by Azure OpenAI

Japanese prep school grades English essays in 20 seconds, down from about four days

WorkingVendor's case studyVendor ↗

Problem

Students needed more English writing practice, but teachers had little time to correct it. A full-time team took about four days to return work.

Approach

The school built the bootcamp on Azure OpenAI (GPT-4) and spread load across 10 regions to serve up to 100,000 simultaneous users. It grades answers from A to E and offers corrections. A trial started in September 2023 and the service launched in April 2024.

Results

20 secondsaverage correction response time at peak useVendor's case study[1]

90%of survey respondents who want to keep using the serviceVendor's case study[1]

Takeaway

In the company's survey, 90% of respondents want to keep using it. The response-time figure is an average at peak use.

Sources

Nagase Brothers customer story
Microsoft28 Jan 2025Vendor publication

Source summaries

[1]Microsoft28 Jan 2025

Microsoft describes an AI-graded English writing course built on Azure OpenAI. It reports an average correction time of 20 seconds at peak use and says 90% of survey respondents wanted to keep using the service.

Full details are in the original sources.

Added 25 Oct 2026 · Updated 25 Oct 2026