AI Agent Memory: Benchmark Comparison

June 9, 2026 · View on GitHub

How agentmemory compares against other persistent memory solutions for AI coding agents.

All numbers here come from published benchmarks or public repositories. We link to primary sources wherever possible so you can reproduce.

Retrieval Accuracy (LongMemEval)

LongMemEval (ICLR 2025) measures long-term memory retrieval across ~48 sessions per question on the S variant (500 questions, ~115K tokens each).

System	Benchmark	R@5	Notes
agentmemory (BM25 + Vector)	LongMemEval-S	95.2%	`all-MiniLM-L6-v2` embeddings, no API key
agentmemory (BM25-only)	LongMemEval-S	86.2%	Fallback when no embedding provider available
MemPalace	LongMemEval-S	~96.6% (self-reported)	Vendor-published number we have not independently reproduced. Vector-only with a larger embedding model and no agent-integration surface (no hooks, no MCP, no multi-agent)
oracleagentmemory	LongMemEval	94.4% (self-reported)	Vendor-published, scored with GPT-5.5 at "xhigh reasoning" and requires an Oracle AI Database. We have not reproduced it. agentmemory's 95.2% uses free local embeddings and no API key
Letta / MemGPT	LoCoMo	83.2%	Different benchmark (LoCoMo, not LongMemEval)
Mem0	LoCoMo	68.5%	Different benchmark (LoCoMo, not LongMemEval)

⚠️ Apples vs oranges caveat: only agentmemory's 95.2% is our own measured result, reproducible from the methodology below. Every other number here is the vendor's published claim, on a different benchmark or harness, that we have not independently reproduced: MemPalace and oracleagentmemory report LongMemEval (oracleagentmemory's run used GPT-5.5 at "xhigh reasoning" against an Oracle AI Database), while Letta and Mem0 publish on LoCoMo. Treat them as ballpark vendor claims, not a head-to-head on identical data. We'd love to run every system on the same dataset; if any maintainer wants to collaborate, open an issue.

Full agentmemory methodology: LONGMEMEVAL.md

Feature Matrix

Feature	agentmemory	mem0	Letta/MemGPT	Khoj	supermemory	MemPalace	oracleagentmemory	Hippo
GitHub stars	Growing	58K+	23K+	35K+	26K+	54K+	PyPI (Oracle)	Trending
Type	Memory engine + MCP server	Memory layer API	Full agent runtime	Personal AI	Memory API + app	Benchmark-focused OSS	Memory engine (Oracle DB)	Memory system
Auto-capture via hooks	✅ 12 lifecycle hooks	❌ Manual `add()`	❌ Agent self-edits	❌ Manual	❌ API-side extraction	❌ Manual	❌ API extraction	❌ Manual
Search strategy	BM25 + Vector + Graph	Vector + Graph	Vector (archival)	Semantic	Vector + RAG	Vector-only (large model)	Vector + semantic	Decay-weighted
Multi-agent coordination	✅ Leases + signals + mesh	❌	Runtime-internal only	❌	❌	❌	Scoped only (user/agent/thread)	Multi-agent shared
Framework lock-in	None	None	High	Standalone	None (drop-in wrappers)	None	Oracle Database	None
External deps	None	Qdrant/pgvector	Postgres + vector	Multiple	Managed cloud	Vector store	Oracle AI Database	None
Self-hostable	✅ default	Optional	Optional	✅	❌ Cloud-only	✅	✅ (needs Oracle DB)	✅
Knowledge graph	✅ Entity extraction + BFS	✅ Mem0g variant	❌	Doc links	❌	❌	❌	❌
Memory decay	✅ Ebbinghaus + tiered	❌	❌	❌	✅ Auto-forget	❌	❌	✅ Half-lives
4-tier consolidation	✅ Working → episodic → semantic → procedural	❌	OS-inspired tiers	❌	❌	❌	❌	Episodic + semantic
Version / supersession	✅ Jaccard-based	Passive	❌	❌	✅ Auto-resolve	❌	❌	❌
Real-time viewer	✅ Port 3113	Cloud dashboard	Cloud dashboard	Web UI	Cloud dashboard	❌	❌	❌
Privacy filtering	✅ Strips secrets pre-store	❌	❌	❌	❌	❌	❌	❌
Obsidian export	✅ Built-in	❌	❌	Native format	❌	❌	❌	❌
Cross-agent	✅ MCP + REST	API calls	Within runtime	Standalone	MCP + API	Standalone	Python API	Multi-agent shared
Audit trail	✅ All mutations logged	❌	Limited	❌	❌	❌	❌	❌
Language SDKs	Any (REST + MCP)	Python + TS	Python only	API	Python + TS	Python	Python only	Node

Token Efficiency

The main reason to use persistent memory at all: token cost. Here's what one year of heavy agent use looks like across approaches.

Approach	Tokens / year	Cost / year	Notes
Paste full history into context	19.5M+	Impossible	Exceeds context window after ~200 observations
LLM-summarized memory (extraction-based)	~650K	~$500	Lossy — summarization drops detail
agentmemory (API embeddings)	~170K	~$10	Token-budgeted, only relevant memories injected
agentmemory (local embeddings)	~170K	$0	`all-MiniLM-L6-v2` runs in-process
supermemory	Not published	Cloud pricing	Managed API, no local token budget
Mem0	Varies by integration	Varies	Extraction-based, no token budget

agentmemory ships with a built-in token savings calculator. Run npx @agentmemory/agentmemory status after a few sessions and you'll see exactly how many tokens you've saved vs. pasting the full history.

What Each Tool Is Best At

This isn't a "agentmemory wins everything" page. Different tools solve different problems.

Choose agentmemory if you want:

Automatic capture with zero manual add() calls
MCP server that works across Claude Code, Cursor, Codex, Gemini CLI, etc.
Hybrid BM25 + vector + graph search
Real-time viewer to see what your agent is learning
Self-hostable with zero external databases
Privacy filtering on API keys and secrets
Multi-agent coordination (leases, signals, routines)

Choose Mem0 if you want:

Framework-agnostic API to bolt onto an existing agent
Managed cloud option with a dashboard
Python + TypeScript SDKs for direct integration
Entity/relationship extraction as the primary abstraction

Choose Letta/MemGPT if you want:

A full agent runtime, not just memory
OS-inspired memory tiers (core/archival/recall)
Agents that self-edit their memory via function calls
Long-running conversational agents (weeks/months)

Choose Khoj if you want:

A personal AI second brain, not agent infrastructure
Document-first search over your files and the web
Obsidian/Notion/Emacs integrations
Scheduled automations and research tasks

Choose supermemory if you want:

A managed memory API with server-side auto-extraction and automatic forgetting
Drop-in wrappers for major AI frameworks (Vercel AI, LangChain, LangGraph)
A hosted dashboard with no infrastructure to run yourself
RAG plus memory served from a single query

Choose MemPalace if you want:

A simple, free, open-source vector memory store
To chase its self-reported retrieval benchmark (we have not reproduced it)
Pure retrieval over agent workflow features
Note: no auto-capture, no MCP, no multi-agent coordination, so you wire all integration yourself

Choose oracleagentmemory if you want:

You already run on Oracle AI Database and want memory inside it
Enterprise Oracle stack with vector search in the same database
LLM-backed extraction and are fine paying for a frontier model (their benchmark used GPT-5.5)
Note: Python-only, Oracle Database required, no MCP, no real-time viewer

Choose Hippo if you want:

Biologically-inspired memory model (decay, consolidation, sleep)
Multi-agent shared memory as a primary feature
"Forget by default, earn persistence through use" philosophy

Running Your Own Benchmarks

We encourage you to measure this yourself rather than trust any README. Here's how:

# Clone the repo
git clone https://github.com/rohitg00/agentmemory.git
cd agentmemory && npm install

# Run LongMemEval-S
npm run bench:longmemeval

# Run quality benchmark (240 observations, 20 queries)
npm run bench:quality

# Run scale benchmark
npm run bench:scale

# Run real embeddings benchmark
npm run bench:real-embeddings

Results land in benchmark/results/. All scripts, datasets, and results are committed for reproducibility.

Corrections Welcome

If you maintain one of these tools and we got a number wrong, please open an issue or PR. We'd rather have accurate numbers than convenient ones.

If you want to add your tool to this comparison, open a PR with:

A link to your benchmark methodology
The metric and dataset you're measuring on
A commit hash / version so we can reproduce

Sources:

Mem0 LoCoMo benchmark: mem0.ai blog
Letta LoCoMo benchmark: letta.com/blog/benchmarking-ai-agent-memory
LongMemEval paper: arxiv.org/abs/2410.10813
LoCoMo paper: snap-stanford.github.io/LoCoMo