These tools competes with

LangGraphvsLetta

Graph-based stateful agent orchestration versus Stateful agents with long-term memory — formerly MemGPT

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Choose LangGraph when…

  • •You need stateful, graph-based agent control flow
  • •Complex branching or retry logic is required
  • •You're building production agents that need observability

Choose Letta when…

  • •need agents with persistent cross-session memory
  • •context window length is limiting your application
  • •building personal assistants or long-running agents

Side-by-side comparison

Field
LangGraph
Letta
Category
Agent Frameworks
Agent Frameworks
Type
Open Source
Open Source
Free Tier
✓ Yes
✓ Yes
Pricing Plans
—
Open Source: FreeCloud: $20/mo
GitHub Stars
⭐ 8,000
⭐ 13,200
Health
●95 — Active
●100 — Active

LangGraph

Build stateful multi-actor applications as directed graphs. Part of the LangChain ecosystem. Strong for complex agentic workflows.

Website ↗GitHub ↗

Letta

Letta (formerly MemGPT) is an open-source framework for building stateful AI agents with persistent, editable memory. Agents remember conversations across sessions, search their own memory, and update their knowledge over time — solving context window limitations.

Website ↗GitHub ↗

Only LangGraph (30)

CrewAICursorLangSmithLiteLLMLlamaIndexSweep AILangfuseQdrantE2Bpgvector

Only Letta (2)

LangGraphOpenAI API

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See how LangGraph and Letta fit into the bigger picture — 235 tools, 543 relationships, all mapped.

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