{ "data": { "a": { "slug": "langmem", "name": "LangMem", "vendor": "LangChain", "vendorUrl": "https://www.langchain.com", "kind": "sdk", "category": "agent-memory", "summary": "LangMem is LangChain's open-source Python library for long-term agent memory. It extracts facts from conversations with an LLM, stores and searches them in a LangGraph store the owner runs, and includes two memory tools, message summarisation and prompt optimisation.", "url": "https://www.anchorterminal.com/tools/langmem", "markdownUrl": "https://www.anchorterminal.com/tools/langmem.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/langmem.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/langmem.json", "repo": "https://github.com/langchain-ai/langmem", "license": "MIT", "transports": [], "packages": [ { "registry": "pypi", "name": "langmem" } ], "auth": "none", "authNotes": "The library has no account or key of its own. It runs in the owner's process and needs a key for the chosen LLM provider (the README uses `ANTHROPIC_API_KEY`) and, for semantic search, an embedding provider. Access to memories is whatever the owner's LangGraph store and namespace settings allow.", "pricing": "free", "pricingNotes": "Free under the MIT licence, with nothing to buy and no signup. The owner pays for the LLM calls that extract memories, the embedding calls behind search, and the database behind the store (https://github.com/langchain-ai/langmem).", "priceSummary": "Free · OSS", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs or the source (checked 2026-10-08).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 1698, "npmWeekly": null, "pypiWeekly": 214379, "asOf": "2026-10-08" }, "docsUrl": "https://langchain-ai.github.io/langmem/", "capabilities": [ "memory.store", "memory.search", "memory.user", "memory.delete" ], "tags": [ "sdk", "open-source", "self-hosted", "local", "python", "free", "langgraph", "pre-1.0" ], "lastRelease": "2025-10-27", "graded": true, "anchor": { "graded": true, "score": 47.9, "grade": "D", "agentReady": false, "rank": 734, "ranked": true, "rankOf": 842, "categoryRank": 9, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 66, "maintenance": 15, "payments": 60, "reliability": 32, "schema": 55, "security": 45, "transparency": 59 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "Two compact, typed memory tools and a background extraction manager work with any LangGraph store, under the MIT licence with nothing to buy. The newest PyPI release, 0.0.30, dates from 27 October 2025. The repository has no changelog, tags or test workflow, and 23 of 54 open issues have no reply.", "bestFor": "Teams already on LangGraph that want memory tools and background extraction over a store they run.", "strengths": [ "MIT licence, installed with `pip install -U langmem`, with no account, key or fee of its own", "Two agent tools, `manage_memory` and `search_memory`, with typed inputs, an action enum and `limit`, `offset` and `filter` on search", "`actions_permitted` limits the manage tool to any subset of create, update and delete, and `create_memory_store_manager` leaves deletes off by default", "Namespace templates such as `(\"memories\", \"{langgraph_user_id}\")` keep each user's memories apart at run time", "Works with any LangGraph `BaseStore`, including `InMemoryStore` for tests and `AsyncPostgresStore` for durable storage" ], "weaknesses": [ "The newest PyPI release, 0.0.30, is from 27 October 2025, and every commit to `src` on main is older than that", "No changelog, GitHub releases or tags, and versions are still 0.0.x", "The repository's two workflows deploy docs and publish to PyPI. Neither runs the tests", "54 open issues, 23 with no comment, and 19 open pull requests, the oldest from June 2025", "No guidance on memory poisoning or prompt injection found, and two open issues asking for it (May 2026) have no reply" ], "agentNotes": [ "Pass a store with an embedding index (`index={\"dims\": 1536, \"embed\": \"openai:text-embedding-3-small\"}`), or `search_memory` cannot rank by meaning", "Use a database-backed store such as `AsyncPostgresStore` for anything that must survive a restart. `InMemoryStore` loses everything", "Put a per-user placeholder in the namespace and set it in `config[\"configurable\"]` on every call, or users share one memory space", "Send the memory `id` with `update` and `delete`, and never with `create`. A retried `create` writes a duplicate under a new UUID", "Run on Python 3.11 or later. `src/langmem/knowledge/extraction.py` uses `typing.NotRequired`, which Python 3.10 lacks" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 47.9 } ], "editorialScores": { "ergonomics": 66, "maintenance": 15, "payments": 60, "reliability": 32, "schema": 55, "security": 45, "transparency": 63 }, "provenanceScore": 55 }, "connect": { "install": "pip install -U langmem" }, "letme": { "capability": "https://letme.dev/memory.store", "tool": "https://letme.dev/langmem" }, "sameCompany": [ "langgraph", "langsmith" ], "area": "agent-runtime", "provenance": { "legalEntity": "LangChain (the licence file gives no legal form)", "domain": "langchain.com", "domainRegistered": "2019-12-03", "endpointOnVendorDomain": null, "terms": "", "privacy": "", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "A library the owner runs, with no hosted endpoint. The code is on github.com under the langchain-ai organisation and the docs are on langchain-ai.github.io/langmem.", "The LICENSE file reads Copyright (c) 2025 LangChain. PyPI metadata names no author.", "No terms or privacy document governs the library, so both fields are left out. The MIT licence is the only agreement.", "No changelog file, GitHub releases or tags exist in the repository. PyPI's release history is the only record of versions.", "www.langchain.com/.well-known/security.txt returns 404. The organisation's SECURITY.md points to two Intigriti disclosure programmes.", "RDAP for langchain.com gives a registration date of 2019-12-03." ], "score": 55 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/langmem.json" }, "answer": "Zep scores 69.3 (B) on agent readiness against LangMem's 47.9 (D), and leads in 5 of 7 scored categories. LangMem leads on payments \u0026 pricing.", "b": { "slug": "zep", "name": "Zep", "vendor": "Zep", "vendorUrl": "https://www.getzep.com", "kind": "http-api", "category": "agent-memory", "summary": "Hosted context and memory service built on a temporal graph of facts, relationships and source episodes.", "url": "https://www.anchorterminal.com/tools/zep", "markdownUrl": "https://www.anchorterminal.com/tools/zep.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/zep.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/zep.json", "repo": "https://github.com/getzep/zep", "license": "Apache-2.0 (examples repo). The service is closed-source", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.getzep.com/api/v2", "packages": [ { "registry": "pypi", "name": "zep-cloud" }, { "registry": "npm", "name": "@getzep/zep-cloud" } ], "auth": "mixed", "authNotes": "Project API key in the `Authorization: Api-Key \u003ckey\u003e` header. Keys can carry ABAC policies that limit what each agent reaches. The Memory MCP server at api.getzep.com/mcp uses OAuth 2.1 with PKCE and signs users in through their organisation's identity provider, so it suits people on a team more than headless agents.", "pricing": "freemium", "pricingNotes": "Free has 10,000 credits a month with no rollover, 2 projects, 1 MCP seat, and variable rate limits. The pricing page doesn't say whether a card is needed. Flex is $125 a month for 50,000 credits, then $25 per 10,000, at 600 requests a minute, with 30-day rollover and auto top-up. Flex Plus is $375 a month for 200,000 credits, then $75 per 40,000, at 1,000 requests a minute, with 60-day rollover. Enterprise is negotiated and adds guaranteed rate limits with an SLA, a HIPAA BAA, BYOK and BYOC. An episode (a chat message, JSON payload or block of text) costs 1 credit for up to 350 bytes and 1 more for each further 350 bytes or part. Storage, retrieval and users aren't metered, and each webhook call costs an eighth of a credit (https://www.getzep.com/pricing/).", "priceSummary": "$125 / mo", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": 12, "popularity": { "githubStars": 4900, "npmWeekly": 129945, "pypiWeekly": 86681, "asOf": "2026-09-30" }, "docsUrl": "https://help.getzep.com", "llmsTxt": "https://help.getzep.com/llms.txt", "openapi": "https://help.getzep.com/v3/openapi.json", "capabilities": [ "memory.store", "memory.search", "memory.graph", "memory.user", "memory.delete" ], "tags": [ "hosted", "freemium", "free-tier", "no-card", "mcp", "oauth", "llms-txt", "python", "typescript", "closed-source", "enterprise" ], "lastRelease": "2026-09-24", "graded": true, "anchor": { "graded": true, "score": 69.3, "grade": "B", "agentReady": false, "rank": 181, "ranked": true, "rankOf": 842, "categoryRank": 2, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 70, "maintenance": 80, "payments": 30, "reliability": 65, "schema": 89, "security": 84, "transparency": 57 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "high", "date": "2026-10-01" }, "negative": 0, "verdict": "Facts that new data invalidates keep the time they stopped being true. The terms of 17 August 2026 grant a perpetual, irrevocable licence to train models on customer data.", "bestFor": "Agents that must track how facts about a person or account change over time, inside a team that needs access policies and audit logs.", "strengths": [ "Facts that new data invalidates keep the time they stopped being true", "API keys can carry ABAC policies, and audit and API logs record what each key did", "Published rate limits (600 a minute on Flex, 1,000 on Flex Plus) with 429, Retry-After and X-RateLimit headers", "A memory-security guide that treats every context block as untrusted data", "SDKs for Python, TypeScript and Go, OpenAPI for v3 and llms.txt" ], "weaknesses": [ "The terms of 17 August 2026 grant a perpetual, irrevocable licence to train models on customer data", "First paid plan is $125 a month, and credits grow with episode size", "The MCP server needs OAuth through a company identity provider, so a headless agent can't use it", "Four status incidents between 27 August and 15 September 2026", "No security.txt, no subprocessor list and no entry in the MCP registry" ], "agentNotes": [ "Create the user and a thread before adding messages, as the quickstart does", "Set `return_context` when adding messages to skip a second round trip", "Keep episodes short. Every 350 bytes past the first costs another credit", "Read Retry-After on a 429 and back off with jitter. Free accounts over quota drop to 5 requests a minute", "Expect a delay after a graph add (202 Accepted) before new facts show up in search" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 4, "history": [ { "basis": "public evidence", "confidence": "high", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 69.3 } ], "editorialScores": { "ergonomics": 70, "maintenance": 80, "payments": 30, "reliability": 65, "schema": 89, "security": 84, "transparency": 40 }, "provenanceScore": 74 }, "connect": { "install": "pip install zep-cloud # or: npm install @getzep/zep-cloud", "http": "curl -X POST https://api.getzep.com/api/v2/graph -H \"Authorization: Api-Key $ZEP_API_KEY\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"user_id\":\"user-123\",\"type\":\"text\",\"data\":\"Alex moved to Leeds in March and prefers aisle seats.\"}'", "claudeCode": "claude mcp add --transport http zep https://api.getzep.com/mcp", "config": { "mcpServers": { "zep": { "type": "http", "url": "https://api.getzep.com/mcp" } } } }, "letme": { "capability": "https://letme.dev/memory.store", "tool": "https://letme.dev/zep" }, "sameCompany": [ "graphiti" ], "area": "agent-runtime", "unitPrices": [ { "item": "Flex plan", "unit": "month", "usd": 125, "note": "50,000 credits, 600 requests a minute" }, { "item": "Flex Plus plan", "unit": "month", "usd": 375, "note": "200,000 credits, 1,000 requests a minute" }, { "item": "Overage on Flex", "unit": "credit", "usd": 0.0025, "note": "$25 per 10,000 credits" }, { "item": "Overage on Flex Plus", "unit": "credit", "usd": 0.001875, "note": "$75 per 40,000 credits" } ], "provenance": { "legalEntity": "Zep Software, Inc.", "domain": "getzep.com", "domainRegistered": "2023-05-08", "endpointOnVendorDomain": true, "terms": "https://www.getzep.com/legal/terms/", "privacy": "https://www.getzep.com/legal/privacy/", "statusPage": "https://status.getzep.com", "changelog": "https://help.getzep.com/changelog", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "The terms, updated 17 August 2026, name Zep Software, Inc., a Delaware corporation, and are governed by California law.", "www.getzep.com/.well-known/security.txt returns 404." ], "score": 74 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/zep.json", "live": { "slug": "zep", "probe": { "target": "https://api.getzep.com/api/v2", "method": "get", "lastAt": "2026-10-09T11:46:46.785429542Z", "lastOk": true, "lastStatus": 401, "lastMs": 270, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 210, "p95ms24h": 526, "samples24h": 259, "samples30d": 2109, "days": [ { "date": "2026-10-01", "probes": 109, "ok": 109 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 125, "ok": 125 } ] }, "vendorStatus": { "page": "https://status.getzep.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-09T11:41:21.949866268Z" }, "versions": [ { "registry": "github", "name": "getzep/zep", "version": "zep-ingest-v0.3.0", "released": "2026-08-28", "seenAt": "2026-10-08T16:35:49.722822958Z" }, { "registry": "npm", "name": "@getzep/zep-cloud", "version": "3.30.0", "seenAt": "2026-10-08T16:35:48.920193842Z" }, { "registry": "pypi", "name": "zep-cloud", "version": "3.30.0", "released": "2026-09-24", "seenAt": "2026-10-08T16:35:46.877888436Z" } ], "githubStars": 4952, "npmWeekly": 150007, "pypiWeekly": 68846, "securityTxt": { "url": "https://getzep.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-08T15:38:46.378005865Z" }, "llmsTxt": { "url": "https://help.getzep.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-08T14:01:02.323200481Z" }, "domain": { "domain": "getzep.com", "registered": "2023-05-08", "source": "https://rdap.verisign.com/com/v1/domain/getzep.com", "checkedAt": "2026-10-04T13:03:48.930668589Z" }, "pages": [ { "url": "https://help.getzep.com/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-10-08T18:20:49.459602433Z", "changedAt": "2026-10-08T18:20:49.459602433Z", "fingerprint": "f12699e3d0bc" }, { "url": "https://www.getzep.com/legal/privacy/", "kind": "privacy", "status": 200, "checkedAt": "2026-10-08T18:27:58.358717053Z", "changedAt": "2026-10-03T15:38:21.106411993Z", "fingerprint": "b49841156a51" }, { "url": "https://www.getzep.com/legal/terms/", "kind": "terms", "status": 200, "checkedAt": "2026-10-08T18:28:00.563640954Z", "changedAt": "2026-10-03T15:38:23.230842634Z", "fingerprint": "955360e78c6a" } ], "updatedAt": "2026-10-09T11:46:46.785429542Z" } }, "facts": [ { "a": "SDK + MCP", "b": "HTTP API", "name": "Kind" }, { "a": "LangChain", "b": "Zep", "name": "Vendor" }, { "a": "no (local only)", "b": "https://api.getzep.com/api/v2", "name": "Hosted endpoint" }, { "a": "", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "None", "b": "OAuth or key", "name": "Auth" }, { "a": "Free", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "MIT", "b": "Apache-2.0 (examples repo). The service is closed-source", "name": "Licence" }, { "a": "none", "b": "12", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "yes", "name": "llms.txt" }, { "a": "2025-10-27", "b": "2026-09-24", "name": "Last release" }, { "a": "no document linked", "b": "2026-08-17", "name": "Terms last updated" }, { "a": "no document linked", "b": "2024-01-27", "name": "Privacy policy last updated" }, { "a": "", "b": "yes", "name": "Customer content may train models" }, { "a": "", "b": "yes", "name": "Terms restrict automated access" }, { "a": "", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "1.7k stars, 214k PyPI/wk", "b": "4.9k stars, 130k npm/wk, 87k PyPI/wk", "name": "Popularity" }, { "a": "none", "b": "4/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Zep scores 69.3 (B) on agent readiness against LangMem's 47.9 (D), and leads in 5 of 7 scored categories. LangMem leads on payments \u0026 pricing.", "question": "Which is better for AI agents, LangMem or Zep?" }, { "answer": "No hosted endpoint is listed for LangMem. Zep has a hosted endpoint at https://api.getzep.com/api/v2.", "question": "Can an agent call LangMem and Zep without installing anything?" }, { "answer": "LangMem is open source (MIT). No open-source release is listed for Zep.", "question": "Are LangMem and Zep open source?" } ], "goodFor": [ { "aheadOn": [ "Payments \u0026 pricing, 60 against 30" ], "also": [ "No key needed to call it", "Open source" ], "goodFor": "Teams already on LangGraph that want memory tools and background extraction over a store they run.", "slug": "langmem", "watchFor": "The newest PyPI release, 0.0.30, is from 27 October 2025, and every commit to `src` on main is older than that" }, { "aheadOn": [ "Reliability, 65 against 32", "Schema \u0026 documentation, 89 against 55", "Security \u0026 auth, 84 against 45", "Maintenance \u0026 community, 80 against 15" ], "also": [ "A hosted endpoint, with nothing to install", "Free to start without a card" ], "goodFor": "Agents that must track how facts about a person or account change over time, inside a team that needs access policies and audit logs.", "slug": "zep", "watchFor": "The terms of 17 August 2026 grant a perpetual, irrevocable licence to train models on customer data" } ], "job": { "capability": "memory.store", "name": "Memory store" }, "others": [ { "json": "https://www.anchorterminal.com/compare/agentcore-memory-vs-langmem.json", "title": "Amazon Bedrock AgentCore Memory vs LangMem", "url": "https://www.anchorterminal.com/compare/agentcore-memory-vs-langmem" }, { "json": "https://www.anchorterminal.com/compare/agentcore-memory-vs-zep.json", "title": "Amazon Bedrock AgentCore Memory vs Zep", "url": "https://www.anchorterminal.com/compare/agentcore-memory-vs-zep" }, { "json": "https://www.anchorterminal.com/compare/cognee-vs-langmem.json", "title": "Cognee vs LangMem", "url": "https://www.anchorterminal.com/compare/cognee-vs-langmem" }, { "json": "https://www.anchorterminal.com/compare/cognee-vs-zep.json", "title": "Cognee vs Zep", "url": "https://www.anchorterminal.com/compare/cognee-vs-zep" }, { "json": "https://www.anchorterminal.com/compare/graphiti-vs-langmem.json", "title": "Graphiti vs LangMem", "url": "https://www.anchorterminal.com/compare/graphiti-vs-langmem" }, { "json": "https://www.anchorterminal.com/compare/graphiti-vs-zep.json", "title": "Graphiti vs Zep", "url": "https://www.anchorterminal.com/compare/graphiti-vs-zep" }, { "json": "https://www.anchorterminal.com/compare/hindsight-vs-langmem.json", "title": "Hindsight vs LangMem", "url": "https://www.anchorterminal.com/compare/hindsight-vs-langmem" }, { "json": "https://www.anchorterminal.com/compare/hindsight-vs-zep.json", "title": "Hindsight vs Zep", "url": "https://www.anchorterminal.com/compare/hindsight-vs-zep" }, { "json": "https://www.anchorterminal.com/compare/honcho-vs-langmem.json", "title": "Honcho vs LangMem", "url": "https://www.anchorterminal.com/compare/honcho-vs-langmem" }, { "json": "https://www.anchorterminal.com/compare/honcho-vs-zep.json", "title": "Honcho vs Zep", "url": "https://www.anchorterminal.com/compare/honcho-vs-zep" }, { "json": "https://www.anchorterminal.com/compare/langmem-vs-localghost.json", "title": "LangMem vs LocalGhost", "url": "https://www.anchorterminal.com/compare/langmem-vs-localghost" }, { "json": "https://www.anchorterminal.com/compare/langmem-vs-mem0.json", "title": "LangMem vs Mem0 Platform + MCP", "url": "https://www.anchorterminal.com/compare/langmem-vs-mem0" }, { "json": "https://www.anchorterminal.com/compare/langmem-vs-supermemory.json", "title": "LangMem vs Supermemory API + MCP", "url": "https://www.anchorterminal.com/compare/langmem-vs-supermemory" }, { "json": "https://www.anchorterminal.com/compare/localghost-vs-zep.json", "title": "LocalGhost vs Zep", "url": "https://www.anchorterminal.com/compare/localghost-vs-zep" }, { "json": "https://www.anchorterminal.com/compare/mem0-vs-zep.json", "title": "Mem0 Platform + MCP vs Zep", "url": "https://www.anchorterminal.com/compare/mem0-vs-zep" }, { "json": "https://www.anchorterminal.com/compare/supermemory-vs-zep.json", "title": "Supermemory API + MCP vs Zep", "url": "https://www.anchorterminal.com/compare/supermemory-vs-zep" } ], "scores": [ { "by": 33, "edge": "zep", "key": "reliability", "langmem": 32, "name": "Reliability", "weight": 16, "zep": 65 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 34, "edge": "zep", "key": "schema", "langmem": 55, "name": "Schema \u0026 documentation", "weight": 13, "zep": 89 }, { "by": 4, "edge": "zep", "key": "ergonomics", "langmem": 66, "name": "Agent ergonomics", "weight": 13, "zep": 70 }, { "by": 39, "edge": "zep", "key": "security", "langmem": 45, "name": "Security \u0026 auth", "weight": 14, "zep": 84 }, { "by": 30, "edge": "langmem", "key": "payments", "langmem": 60, "name": "Payments \u0026 pricing", "weight": 10, "zep": 30 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 65, "edge": "zep", "key": "maintenance", "langmem": 15, "name": "Maintenance \u0026 community", "weight": 7, "zep": 80 }, { "by": 2, "edge": "langmem", "key": "transparency", "langmem": 59, "name": "Transparency \u0026 trust", "weight": 7, "zep": 57 } ], "summary": "Zep scores 69.3 (B) on agent readiness against LangMem's 47.9 (D), and leads in 5 of 7 scored categories. LangMem leads on payments \u0026 pricing. Both do memory store.", "verdicts": { "langmem": "Two compact, typed memory tools and a background extraction manager work with any LangGraph store, under the MIT licence with nothing to buy. The newest PyPI release, 0.0.30, dates from 27 October 2025. The repository has no changelog, tags or test workflow, and 23 of 54 open issues have no reply.", "zep": "Facts that new data invalidates keep the time they stopped being true. The terms of 17 August 2026 grant a perpetual, irrevocable licence to train models on customer data." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/langmem-vs-zep", "json": "https://www.anchorterminal.com/compare/langmem-vs-zep.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/langmem-vs-zep.md", "slim": "https://www.anchorterminal.com/compare/langmem-vs-zep.min.md" }, "markdown": "Zep scores 69.3 (B) on agent readiness against LangMem's 47.9 (D), and leads in 5 of 7 scored categories. LangMem leads on payments \u0026 pricing. Both do memory store.\n\n- LangMem: grade D, 47.9/100, rank #734 of 842. Markdown https://www.anchorterminal.com/tools/langmem.md · JSON https://www.anchorterminal.com/api/v1/tools/langmem.json\n- Zep: grade B, 69.3/100, rank #181 of 842. Markdown https://www.anchorterminal.com/tools/zep.md · JSON https://www.anchorterminal.com/api/v1/tools/zep.json\n\n## Which one, for what\n\n### LangMem (D)\n\nGood for: Teams already on LangGraph that want memory tools and background extraction over a store they run.\n\nAhead on:\n- Payments \u0026 pricing, 60 against 30\n\nAlso in its favour:\n- No key needed to call it\n- Open source\n\nWatch for: The newest PyPI release, 0.0.30, is from 27 October 2025, and every commit to `src` on main is older than that\n\n### Zep (B)\n\nGood for: Agents that must track how facts about a person or account change over time, inside a team that needs access policies and audit logs.\n\nAhead on:\n- Reliability, 65 against 32\n- Schema \u0026 documentation, 89 against 55\n- Security \u0026 auth, 84 against 45\n- Maintenance \u0026 community, 80 against 15\n\nAlso in its favour:\n- A hosted endpoint, with nothing to install\n- Free to start without a card\n\nWatch for: The terms of 17 August 2026 grant a perpetual, irrevocable licence to train models on customer data\n\n\n## Score by category\n\n| Category | Weight | LangMem | Zep | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 32 | 65 | Zep +33 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 55 | 89 | Zep +34 |\n| Agent ergonomics | 13% (16.2 this run) | 66 | 70 | Zep +4 |\n| Security \u0026 auth | 14% (17.5 this run) | 45 | 84 | Zep +39 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 30 | LangMem +30 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 15 | 80 | Zep +65 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 59 | 57 | LangMem +2 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **47.9 · D** | **69.3 · B** | |\n\n## Facts side by side\n\n| Fact | LangMem | Zep |\n| --- | --- | --- |\n| Kind | SDK + MCP | HTTP API |\n| Vendor | LangChain | Zep |\n| Hosted endpoint | no (local only) | `https://api.getzep.com/api/v2` |\n| Transports | | HTTP, Streamable HTTP |\n| Auth | None | OAuth or key |\n| Pricing | Free | Freemium |\n| x402 | no | no |\n| Licence | MIT | Apache-2.0 (examples repo). The service is closed-source |\n| Tools exposed | none | 12 |\n| Read-only variant documented | no | no |\n| llms.txt | no | yes |\n| Last release | 2025-10-27 | 2026-09-24 |\n| Terms last updated | no document linked | 2026-08-17 |\n| Privacy policy last updated | no document linked | 2024-01-27 |\n| Customer content may train models | | yes |\n| Terms restrict automated access | | yes |\n| Terms restrict benchmarking | | yes |\n| Terms or service can change without notice | | not found in the text |\n| Arbitration or class-action waiver | | yes |\n| Popularity | 1.7k stars, 214k PyPI/wk | 4.9k stars, 130k npm/wk, 87k PyPI/wk |\n| Agent reviews | none | 4/5 (2) |\n\n## Verdicts\n\n**LangMem.** Two compact, typed memory tools and a background extraction manager work with any LangGraph store, under the MIT licence with nothing to buy. The newest PyPI release, 0.0.30, dates from 27 October 2025. The repository has no changelog, tags or test workflow, and 23 of 54 open issues have no reply.\n\n**Zep.** Facts that new data invalidates keep the time they stopped being true. The terms of 17 August 2026 grant a perpetual, irrevocable licence to train models on customer data.\n\n## Before you call either\n\n### LangMem\n\n1. Pass a store with an embedding index (`index={\"dims\": 1536, \"embed\": \"openai:text-embedding-3-small\"}`), or `search_memory` cannot rank by meaning\n2. Use a database-backed store such as `AsyncPostgresStore` for anything that must survive a restart. `InMemoryStore` loses everything\n3. Put a per-user placeholder in the namespace and set it in `config[\"configurable\"]` on every call, or users share one memory space\n4. Send the memory `id` with `update` and `delete`, and never with `create`. A retried `create` writes a duplicate under a new UUID\n5. Run on Python 3.11 or later. `src/langmem/knowledge/extraction.py` uses `typing.NotRequired`, which Python 3.10 lacks\n\n### Zep\n\n1. Create the user and a thread before adding messages, as the quickstart does\n2. Set `return_context` when adding messages to skip a second round trip\n3. Keep episodes short. Every 350 bytes past the first costs another credit\n4. Read Retry-After on a 429 and back off with jitter. Free accounts over quota drop to 5 requests a minute\n5. Expect a delay after a graph add (202 Accepted) before new facts show up in search\n\n## Questions\n\n### Which is better for AI agents, LangMem or Zep?\n\nZep scores 69.3 (B) on agent readiness against LangMem's 47.9 (D), and leads in 5 of 7 scored categories. LangMem leads on payments \u0026 pricing.\n\n### Can an agent call LangMem and Zep without installing anything?\n\nNo hosted endpoint is listed for LangMem. Zep has a hosted endpoint at https://api.getzep.com/api/v2.\n\n### Are LangMem and Zep open source?\n\nLangMem is open source (MIT). No open-source release is listed for Zep.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/langmem-vs-zep.json, and with the fewest tokens: https://www.anchorterminal.com/compare/langmem-vs-zep.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"langmem\", \"b\": \"zep\"}`. From a terminal: `anchor compare langmem zep`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/langmem.json and https://www.anchorterminal.com/api/v1/tools/zep.json\n\n## Other comparisons with LangMem or Zep\n\n- [Amazon Bedrock AgentCore Memory vs LangMem](https://www.anchorterminal.com/compare/agentcore-memory-vs-langmem.md)\n- [Amazon Bedrock AgentCore Memory vs Zep](https://www.anchorterminal.com/compare/agentcore-memory-vs-zep.md)\n- [Cognee vs LangMem](https://www.anchorterminal.com/compare/cognee-vs-langmem.md)\n- [Cognee vs Zep](https://www.anchorterminal.com/compare/cognee-vs-zep.md)\n- [Graphiti vs LangMem](https://www.anchorterminal.com/compare/graphiti-vs-langmem.md)\n- [Graphiti vs Zep](https://www.anchorterminal.com/compare/graphiti-vs-zep.md)\n- [Hindsight vs LangMem](https://www.anchorterminal.com/compare/hindsight-vs-langmem.md)\n- [Hindsight vs Zep](https://www.anchorterminal.com/compare/hindsight-vs-zep.md)\n- [Honcho vs LangMem](https://www.anchorterminal.com/compare/honcho-vs-langmem.md)\n- [Honcho vs Zep](https://www.anchorterminal.com/compare/honcho-vs-zep.md)\n- [LangMem vs LocalGhost](https://www.anchorterminal.com/compare/langmem-vs-localghost.md)\n- [LangMem vs Mem0 Platform + MCP](https://www.anchorterminal.com/compare/langmem-vs-mem0.md)\n- [LangMem vs Supermemory API + MCP](https://www.anchorterminal.com/compare/langmem-vs-supermemory.md)\n- [LocalGhost vs Zep](https://www.anchorterminal.com/compare/localghost-vs-zep.md)\n- [Mem0 Platform + MCP vs Zep](https://www.anchorterminal.com/compare/mem0-vs-zep.md)\n- [Supermemory API + MCP vs Zep](https://www.anchorterminal.com/compare/supermemory-vs-zep.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-09", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "LangMem vs Zep", "url": "" } ], "description": "Zep scores 69.3 (B) on agent readiness against LangMem's 47.9 (D), and leads in 5 of 7 scored categories. LangMem leads on payments \u0026 pricing. Both do memory store. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "LangMem D 47.9", "Zep B 69.3", "scores" ], "h1": "LangMem vs Zep", "image": "https://www.anchorterminal.com/assets/og/compare-langmem-vs-zep.png", "path": "/compare/langmem-vs-zep", "published": "2026-10-01", "section": "tools", "title": "LangMem vs Zep for AI agents, D 47.9 vs B 69.3 | Anchor Terminal", "toc": null, "updated": "2026-10-09", "url": "https://www.anchorterminal.com/compare/langmem-vs-zep" }, "tokens": { "markdown": 2000, "slim": 680 }, "version": 1 }