EverOS: Open-Source Long-Term Memory Operating System for Self-Evolving AI Agents

Fri, 01 May 2026 00:00:00 +0000

EverOS is an open-source long-term memory operating system for AI agents developed by EverMind, the AI research lab backed by Shanda Group. In an era where most AI agents operate with short-term, session-bound memory, EverOS introduces a persistent, self-organizing memory infrastructure that lets agents remember, reason, and evolve across sessions indefinitely.

The project has garnered over 4,200 GitHub stars and is backed by multiple peer-reviewed papers accepted at ACL 2026. Its monorepo architecture unifies four core components: EverCore (the self-organizing memory OS), HyperMem (the hypergraph memory engine), EverMemBench (a three-layer memory evaluation framework), and EvoAgentBench (an agent self-evolution benchmark).

graph TD
 A[Agent/LLM] --> B[EverCore]
 B --> C[HyperMem Hypergraph]
 B --> D[mRAG Multimodal Retriever]
 C --> E[Topic Hyperedges]
 C --> F[Event Hyperedges]
 C --> G[Fact Hyperedges]
 D --> H[Dense Vectors]
 D --> I[Sparse Keywords]
 D --> J[Multimodal Signals]
 B --> K[Evolved Skills]
 K --> A

What makes EverOS truly groundbreaking is its self-evolving capability. Agents can automatically distill skills and patterns from their task execution history, leading to a measured 234.8% relative improvement in complex task success rates over the baseline. This is not merely a caching layer – it is an active memory that grows smarter the more it is used.

Hypergraph on SoloSoft

EverOS: Open-Source Long-Term Memory Operating System for Self-Evolving AI Agents