Living systematic review

Agent / long-term memory

Giving LLM agents persistent, retrievable memory across turns and sessions.

69 papers99 critique receipts540 benchmark resultsupdated Jun 18, 2026

Most-superseded baselines

Ranked by how many distinct papers critique or beat each method — the standard baselines newer work routinely measures against.

  1. 1
    Mem0

    Mem0: Building Production-Ready AI Agents with Scalable Long-Term Memory

    3 critique · 15 beaten on benchmarks

  2. 2
    A-MEMin Mem0

    A-MEM: Agentic Memory for LLM Agents

    5 critique · 12 beaten on benchmarks

  3. 3
    Zepin Mem0

    Zep: A Temporal Knowledge Graph Architecture for Agent Memory

    1 critique · 9 beaten on benchmarks

  4. 4
    Nemori

    Nemori: Self-Organizing Agent Memory Inspired by Cognitive Science

    2 critique · 5 beaten on benchmarks

  5. 5
    RAPTOR

    RAPTOR: Recursive Abstractive Processing for Tree-Organized Retrieval

    3 critique · 4 beaten on benchmarks

  6. 6
    MemGPTin RAPTOR

    MemGPT: Towards LLMs as Operating Systems

    4 critique · 3 beaten on benchmarks

  7. 7
    HippoRAG 2in RAPTOR

    From RAG to Memory: Non-Parametric Continual Learning for Large Language Models

    1 critique · 5 beaten on benchmarks

  8. 8
    MemoryOSin Mem0

    Memory OS of AI Agent

    2 critique · 4 beaten on benchmarks

  9. 9
    HippoRAGin RAPTOR

    HippoRAG: Neurobiologically Inspired Long-Term Memory for Large Language Models

    4 critique · 2 beaten on benchmarks

  10. 10
    LightMemin Mem0

    LightMem: Lightweight and Efficient Memory-Augmented Generation

    1 critique · 4 beaten on benchmarks

  11. 11
    Reflexion

    Reflexion: Language Agents with Verbal Reinforcement Learning

    3 critique · 2 beaten on benchmarks

  12. 12
    Memory-R1in Mem0

    Memory-R1: Enhancing Large Language Model Agents to Manage and Utilize Memories via Reinforcement Learning

    4 critique · 1 beaten on benchmarks

The competition

Methods that fight on the same benchmarks cluster into distinct sub-problems.

Mem031 methods

Mem0 · A-MEM · Zep · MemoryOS · LightMem · Memory-R1

RAPTOR25 methods

RAPTOR · MemGPT · HippoRAG 2 · HippoRAG · MemoryBank · GraphRAG

Nemori13 methods

Nemori · MemSkill · MemOS · EverMemOS · MAGMA · Memora

Chameleon9 methods

Chameleon · MemoryVLA · Long Term Memory · DP-PTP · SAM2Act+ · ReMem-VLA

Reflexion5 methods

Reflexion · Retrospex · AriGraph · EMPO^2 · Simulacra

MIRIX3 methods

MIRIX · EviMem · MemBuilder

ReMem3 methods

ReMem · Live-Evo · MiroFlow

Memento3 methods

Memento · Learning to Retrieve · MemRL

Generative Agents3 methods

Generative Agents · Mem-Gallery · MemLens

The frontier

Recent methods not yet superseded in the knowledge base.