Case law, legislation and scholarship
Collegiate decisions from Brazilian courts and qualified precedents, federal, state and municipal legislation, and open-access legal scholarship.
Brazilian legal research, with the official source in every answer.
IAJUS brings together Brazilian case law, legislation, súmulas and legal scholarship. People ask in Portuguese and receive the decision with the official court link, inside the AI assistant they already use, on WhatsApp or by email.
This page has no Portuguese version. It summarizes facts published on the IAJUS public pages.
01 The problem
AI should not answer alone when the law keeps changing
An AI model should not answer on its own when the matter depends on laws, case law and documents that change all the time. Research supports professional judgement only when the original material can be read and checked. The answer is not a bigger model. It is giving the model access to curated, up-to-date legal information, and keeping the professional at the center of the decision.
02 The product
One legal collection, wherever people already work
IAJUS searches its collection and answers from the material it finds, with links to the supporting decisions. When it does not find a result, the answer says so.
Several ways to search
Semantic, hybrid and keyword search, filters and a legal classification aligned with the Brazilian National Council of Justice taxonomy.
AI assistants, WhatsApp and email
Claude, ChatGPT and ChatGPT Work/Codex, Gemini, Perplexity, Mistral, Manus and Grok, plus WhatsApp and email, all with one account and one shared allowance.
Plans for individuals and law firms
Beta access is by invitation and free during the beta. Plus, Pro and the law-firm plan are quoted by the team.
03 What sets IAJUS apart
Official sources, open standards, the main platforms
Official sources only
Every decision and every law comes straight from the public body that published it: the courts' own portals, the Planalto portal, legislative assemblies and official gazettes. No third-party aggregators. Provenance is recorded and duplicate records are removed.
An MCP server
Any client compatible with MCP and OAuth 2.1 connects through one address, https://mcp.iajus.com.br/mcp. Sign-in is OAuth 2.1 with the user's IAJUS account; accounts can also use an ik_… key as a Bearer token, a manual alternative to OAuth that is treated like a password.
Plugins on the main agent platforms
The IAJUS plugin installs from its marketplace in Claude, including Claude Code, and is published in the ChatGPT plugin directory. Gemini Spark, Perplexity, Mistral, Manus and Grok connect through the MCP server.
Honest scope and Brazilian hosting
The published coverage says what the collection includes and where it is still growing. The database and search run in the São Paulo region, and commercial AI models are used under zero data retention.
04 The team and the company
Built by founders from law, computing and data science
IAJUS has four founding partners: Rafael Bittencourt, Lucas Arieh Medina, Berto Igor Caballero and Eduardo Aurélio Resende Pereira. It grew out of academic research at the University of Brasília (UnB) on the limits of generative AI in law. Celeris Juris Tecnologia e Inteligência Jurídica LTDA - 68.398.872/0001-93 is the founding company and creator of IAJUS.
05 Programs
Programs we take part in
Celeris Juris, the developer of IAJUS, is a member of the NVIDIA Inception program and of the Google for Startups Cloud Program.
© 2026 NVIDIA, the NVIDIA logo, and NVIDIA Inception are trademarks and/or registered trademarks of NVIDIA Corporation in the U.S. and other countries.
Google and the Google for Startups logo are trademarks of Google LLC.
06 Contact
Talk to the founders
To talk about the project, write to contato@iajus.com.br or use the contact form.