Graphiti vs Letta

Pick two tools from the same category to compare side-by-side.

	Graphiti Open-source temporal knowledge-graph framework from Zep for building agent memory.	Letta Stateful agent memory framework (formerly MemGPT); core+archival tiers.
Category	memory	memory
Vendor type	hybrid	open source
Pricing	freemium	freemium
Strengths	+ Bi-temporal model tracks when facts became true and when they changed + Hybrid retrieval across semantic, keyword, and graph traversal + Incremental episodic updates without full graph recomputation + Open source with a managed Zep platform for enterprise scale	+ Mature memory architecture (core/archival/recall tiers) + Open source with managed option + Designed for long-lived agents
Tradeoffs	− Requires running a supported graph database backend − Graph-based memory adds modeling complexity over simple vector stores − LLM calls for entity extraction add ingestion cost and latency	− More setup overhead than simple memory layers
Used in stacks	0	0