Building an AI Mediator: Multi-LLM Architecture for Legal Dispute Resolution

At Acuerdio ( https://acuerdio.com ), we built Spain's first AI-powered online mediation platform. Here's how we designed a multi-LLM architecture that understands legal conflicts and proposes fair solutions. The Problem Spain's new law (LO 1/2025) requires parties to attempt alternative dispute resolution before going to court. That's millions of potential cases — from neighbor disputes to family conflicts — that need a scalable, AI-assisted mediation process. We needed an AI system that could: Understand legal context in Spanish Propose balanced solutions to both parties Generate legally valid documents Handle sensitive emotional situations with empathy Architecture: Multi-Provider LLM Strategy We don't rely on a single LLM. Our architecture uses multiple providers with intelligent routing. Why Multi-LLM? Resilience — If one provider goes down, we failover automatically Cost optimization — Use cheaper models for simple tasks Best-of-breed — Each model excels at different aspects of m