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14 use cases

Source checked means automated checks passed. Reviewed by Mario means personally checked. Summaries are AI-assisted; claims and results belong to the linked sources.

Analyze employee training feedbackSource checked

ENEOS Materials uses a custom GPT for training feedback. Reported task timings fell from one to two hours to 20 seconds; a separate aggregation tool reportedly reduced aggregation time by 90%.

ChatGPT EnterpriseDataJapansource:
8/10 brain cellsas of
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Prepare daily article announcements for SlackSource checked

A KDDI Agile Development Center practitioner uses Claude Code with browser MCP tools to collect article links across four calendars and prepare Slack messages. The author reports a routine taking five minutes fell to 30 seconds and provides execution logs and setup commands.

Claude Code, Chrome DevTools MCP, Playwright MCPAutomationJapansource:
8/10 brain cellsas of
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Accelerate feature development across engineering teamsSource checked

Rakuten engineers use Claude Code for tests, components, bug fixes and documentation. Rakuten reports average feature delivery falling from 24 working days to five. A separate seven-hour vLLM implementation reached 99.9% numerical agreement with its reference, rather than general code correctness.

Claude CodeCodingJapansource:
7/10 brain cellsas of
Read use case
Extract utility usage from receipts for carbon accountingSource checked

ASUENE compared Gemini and GPT-4o models on 200 sample utility receipts, extracting transaction months, consumption and costs. Its tests found Gemini more than four seconds faster on average. The article includes sample documents, outputs and benchmark charts; deployment of the tested models is not established.

Gemini 2.0 Flash; Gemini 2.0 Flash-Lite; GPT-4oDataJapansource:
6/10 brain cellsas of
Read use case
Practice sales conversations with a simulated prospectSource checked

Credit Saison uses a voice-based custom GPT for new sales staff to rehearse prospect conversations and receive feedback. Reduced dependence on experienced colleagues is claimed; no roleplay-specific saving is quantified.

ChatGPT EnterpriseEducationJapansource:
6/10 brain cellsas of
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Build factory time-tracking applications for cost accountingSource checked

A Funai Soken consultant used Gemini-generated code to build tablet applications recording production work times. These records support labor-cost analysis. The vendor story says 80% of that consultant's manufacturing clients use the application; it does not quantify financial savings.

Gemini; Google WorkspaceFinanceJapansource:
6/10 brain cellsas of
Read use case
Create travel landing pages within the marketing teamSource checked

JR Kyushu's sales team uses Gemini to draft landing pages, add booking-search functionality and improve SEO internally. The customer reports an SEO score rising from roughly 40 to 70. The article does not establish a resulting increase in bookings.

Gemini; Google WorkspaceMarketingJapansource:
6/10 brain cellsas of
Read use case
Review social posts against brand valuesSource checked

MOTHERHOUSE's marketing team configured a Gemini Gem with its brand values to review social posts and newsletters. The customer story reports substantially less review work, without quantifying the marketing-specific savings.

Gemini Gems; Google WorkspaceMarketingJapansource:
6/10 brain cellsas of
Read use case
Check specialized Japanese business documentsSource checked

NRI combines Claude, review checklists and previous examples to identify issues in specialized Japanese business documents. Its system filters insignificant suggested edits. The company reports a 50% reduction in review time; detailed evaluation data and code are not published in the story.

Claude 3.5 Sonnet, Amazon BedrockDataJapansource:
6/10 brain cellsas of
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Copilot handles maintenance tasks at PortSource checked

Port engineers delegate small refactorings, bug fixes and TODO items to Copilot while developing other features. Their retrospective reports better self-review and fewer minor review comments, without quantified savings.

GitHub CopilotCodingJapansource:
6/10 brain cellsas of
Read use case
Assist coding, Git operations and pull requestsSource checked

A READYFOR engineering survey documents Claude Code use for coding, Git operations and pull requests. Among 12 respondents, 66% reported saving one to two hours daily, while 42% reported more fatigue. These are self-reported savings rather than controlled productivity measurements.

Claude CodeCodingJapansource:
6/10 brain cellsas of
Read use case
Bring undocumented AWS resources into TerraformSource checked

A Schoo infrastructure engineer used Cursor Agent to investigate a manually maintained AWS account and import about 350 required resources into Terraform. The account contained more than 1,500 listed resources. The post provides technical steps but no measured time saving.

CursorAutomationJapansource:
6/10 brain cellsas of
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Create project tasks from a Cursor workflowSource checked

An Asahi Shimbun workshop demonstrated Cursor workflows for GitHub issue creation, project fields, deadline reminders and meeting documentation. Shell examples are provided. This was an internal hands-on exercise, with no measured productivity outcome.

CursorProductivityJapansource:
5/10 brain cellsas of
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Structure legal arguments with reusable Gemini promptsSource checked

Project Themis uses Gemini prompts to identify inconsistencies, structure arguments and prepare document drafts. The practitioner publishes prompts and a repository, with human review in the workflow. The article provides no validated legal-accuracy or savings study.

Gemini 3.0 Pro; Project ThemisLegalJapansource:
4/10 brain cellsas of
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