Model Behavior Reports Catalogs 3,189 Public LLM Behavior Claims Across 18 Models

Model Behavior Reports, an open-source tracker built by independent researcher Alexandre Variengien, now catalogs 3,189 public observations about how 18 language models behave, grouping them into model portraits rather than benchmark scores. The project is notable because it treats recurring character, writing-style and agentic quirks as data to aggregate, at a time when frontier labs are publishing their own formal misalignment disclosures.