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LangMem

by LangChain

System Card

OrganizationLangChain
Released2025-02
Architecturehierarchical-summary / Episodic + semantic + procedural layers
DetailsThree-layer memory store on top of LangGraph: episodic snippets, semantic facts, and procedural prompts, each with its own write and retrieval policy. Background summarization compresses old episodes.
Parameters—
Domainagent-memoryepisodic-sessionpersonalization
Open SourceYes
WebsiteVisit
CodeRepository
langchainlanggraphtieredsummary

Capability Profile

Benchmark Scores

6 of 14 benchmarks
Data Transparency:2 self-reported4 estimated
Long-Context Retrieval
0/5
RULER
no data
NIAH
no data
LooGLE
no data
LongBench
no data
∞Bench
no data
Multi-Turn Recall
2/2
LoCoMo
6114pSelf-Reported
MemoryBank
71.123pEstimated
Cross-Session Memory
1/1
LongMemEval
58.37pSelf-Reported
Multi-Hop QA
2/3
BABILong
no data
MultiHop-RAG
7144pEstimated
HotpotQA
67.838pEstimated
Agent Task Memory
1/1
AgentBench-Mem
62.79pEstimated
Personalization
0/1
PerLTQA
no data
Factuality / Grounding
0/1
RAGAS
no data
Sources:LangMem launch postArena estimate — derived from capability profile, not independently verified