MENTAT Raises $800K Seed Round to Cut Legal Brief Drafting Time by Up to 95%

MENTAT, a Korean legaltech startup developing AI tools to drastically reduce the time lawyers spend drafting legal briefs, has secured approximately $800K (KRW 1.1 billion) in seed funding.

Collaborative Fund Asia led the round, with participation from accelerator Krypton and financial AI firm Honest AI.

The company draws its name from the MENTAT, a class of human computers in Frank Herbert’s science fiction novel Dune — trained to perform complex reasoning in the absence of machines. True to that spirit, MENTAT’s platform is designed not to replace lawyers’ legal judgment, but to shoulder the heavy lifting of document review and first-draft creation, so attorneys can focus on the work only they can do.

MENTAT’s thesis is straightforward: just as AI coding tools like Claude Code and Gemini CLI have fundamentally changed how developers write software, AI agents can do the same for legal brief writing — a workflow that demands synthesizing vast volumes of material, constructing logical arguments, and producing polished documents that can run dozens of pages. The company argues this is precisely the kind of task where LLM-based agents can deliver the most impact.

In a closed beta involving 60 legal professionals, MENTAT’s platform reduced brief drafting time by between 60% and 95%.

The product ships in two modes. “FSD (Full Self-Drafting)” generates complete first drafts of complaints, responses, and preparatory briefs from uploaded source documents. “Co-pilot” mode lets lawyers work alongside the AI at the paragraph level, steering the drafting process directly. The platform is expected to launch officially as early as late May, with a pay-as-you-go subscription plan for solo attorneys and small-to-mid-sized firms, and an enterprise plan for large law firms and in-house legal teams.

“Demand for lawyer productivity tools in the legal market is growing fast, but AI tools that are genuinely ready for day-to-day practice are still limited,” said Brian Jang, Managing Partner at Collaborative Fund Asia. “The Mentat team combines deep domain expertise in law with the technical capability to build real AI products.””We built Mentat to be what the Mentats of Dune were — not a replacement for human judgment, but a partner that takes on the burden of research and drafting so lawyers can concentrate on what they do best,” said Jusu Kim, CEO of Mentat.