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C4 Model Study Project is a Japan-centered research project on structured thinking. It proposes extending the C4 Model, originally used for software architecture, into areas such as academic papers, literature, grant proposals, and education. Its core AI application is “Thesis Dojo,” positioned as a 7-stage academic paper writing system based on the C4 model; it also offers “Haiku Science” for analyzing haiku structure.
Thesis Dojo’s workflow spans Stage 0 through Stage VII: paper information input and a 35-point C4 score, idea generation with CREATE Prompt, C4 Blueprint design, 7R writing support, quality evaluation, conference presentation preparation, AI-simulated peer review, and submission-material preparation. Outputs include paper structure, PlantUML C4 diagrams, a 10-page slide deck, script outline, cover letter, checklist, and reviewer response. The underlying capabilities page states that it uses the Claude API, but does not disclose the specific model version or technical parameters.
The Professional Plan costs 3,000 JPY per month, including tax, and includes 100 Credits, equivalent to about 300,000 tokens. The official site says this is enough to structure and refine one paper. Once credits are used up, AI usage is automatically locked to prevent unexpected overage charges; an additional 50 Credits costs 1,500 JPY. There is also a research monitoring program limited to 100 participants, free for the first 6 months, but it requires users to provide before-and-after writing structure data for empirical research.
Its strengths are a clear methodology, breaking paper writing into executable steps, and the ability to generate diagrams, presentations, and submission materials. The credit-based model is also suitable for controlling AI costs. The website explicitly states that input and generated data will not be provided to third parties. The limitations are that the product still appears to be in a research and early-promotion stage, with the general public plan listed as March 2027; current empirical evidence is mainly an N=8 pilot with limited scale. Chinese-language support is not specified, and enterprise-grade privacy, SLA, payment methods, and API documentation are also incomplete.
It is better suited to graduate students, academic authors, educators, grant proposal writers, and anyone who wants to analyze literature or complex problems using a structured method. The website does not provide information in its main content about access from mainland China, and payment methods are not specified, so actual usability needs to be tested individually. If you need mature Chinese academic writing support or general-purpose AI assistance, compare it with ChatGPT, Claude, Elicit, Scite, Jenni AI, Paperpal, and Writefull; if your focus is on C4 architecture diagrams, consider Structurizr or IcePanel.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on c4model.org official site.
c4model.org is an Japan AI Apps provider. TG4G tracks its product information, with monthly pricing from $19.30, an overall rating of 7.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach c4model.org directly.