millionways Introduces Thorsten-4, a Foundation Model to Understand Human Behavior

millionways, a behavioral intelligence frontier lab, has introduced Thorsten-4, a foundational Large Psychology Model that predicts how humans think, decide, and act.

Thorsten-4 brings behavioral intelligence to any business conversation, whether human-to-human or human-to-AI.

"Every AI company trains on the same internet, and the internet doesn't record why people do what they do. You can't scrape that, and more compute won't shortcut years of sitting across from real people," said Martin Cordsmeier, co-founder and CEO of millionways, in a statement. "For the next decade, humans will increasingly communicate with AI in conversations that matter. We're making sure that AI knows who it's talking to."

Thorsten-4 turns how people communicate into a clear read on who they are and what they’ll do next. The model works with company conversations, including meetings, interviews, emails, chats, support calls, and earnings calls. It measures each person across 50 behavioral and psychological traits to show what drives them, how they make decisions, how they handle emotion, and how they react under stress. Thorsten-4’s predictions of motivation, decision-making, and cognitive preferences were validated against established psychological assessments.

Checked against those tests and against what participants actually did over several years, Thorsten-4 reached 90 percent predictive accuracy without relying on self-reported data alone. Every read Thorsten-4 returns is explainable, tracing back to the behavioral evidence behind it, and it stays consistent when a user pushes back.

Companies can add Thorsten-4 to the models, agents and AI products they already run, through the millionways Platform, an API, MCP, or a self-hosted deployment.

"Language models learned to predict words. Thorsten-4 learned to predict people and read the room. Understanding people is a different problem from generating language, and it needed its own model built on real behavior," said Max Weidemann, co-founder and chief technology officer of millionways, in a statement. "Every AI system that deals with people will need a model like this, the same way every system that deals with language needed an LLM."