Memory systems
MongoDB Atlas agent memory
Atlas-native agent memory: short-term session collections plus long-term facts via Search/Vector Search
Commercialself-hostable
What it is
Our note
MongoDB documents two memory tiers rather than shipping a separate memory service: session-scoped short-term memory keyed by session_id, and long-term preferences and facts extracted with an LLM into their own collection, retrieved with MongoDB Search or Atlas Vector Search. The indexed-search memory features require Atlas, while basic collection-based memory also runs on self-managed MongoDB Enterprise.
At a glance
- Vendor
- MongoDB
- Business model
- Commercial
- Pricing
- Atlas clusters: Free M0 $0 (512 MB), Flex $0.011/hour (up to $30/month), Dedicated from $0.08/hour (from $56.94/month); no separate memory charge pricing page ↗
- Self-hosting
- Yes, can be self-hosted
- Access
- MongoDB drivers and Atlas APIs; LangChain MongoDBChatMessageHistory, LangGraph MongoDBStore and MongoDBSaver
Links and sources
- Official sitewww.mongodb.com/docs/vector-search/about/ai-agents
- Pricingwww.mongodb.com/pricing
- Sourcewww.mongodb.com/resources/basics/artificial-intelligence/agent-memory
Facts verified nov 10, 2026; added nov 10, 2026. Vendor facts come from the vendor’s own pages; benchmark claims are self-reported unless we say otherwise.