THE COMPARISON / A CLOSER LOOK
Letta (formerly MemGPT) vs Cognee
Compare the listed plans, useful capabilities, and practical tradeoffs.
Prices and features reflect editorial records. Check vendor terms before you buy; documentary checks do not imply hands-on testing.
Letta (formerly MemGPT)
🔴DeveloperAI Knowledge Tools
AI memory platform for building stateful agents that can preserve selected context across sessions, manage long conversations, and support applications that…
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Starting Price
Free ($0/month)Cognee
🔴DeveloperAI Knowledge Tools
Cognee is an open-source agent memory platform that builds a hybrid knowledge graph and vector index from your data so LLM agents recall structured facts, not…
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Starting Price
FreeFeature Comparison
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Letta (formerly MemGPT) - Pros & Cons
Pros
- ✓Purpose-built for persistent agent memory, making it a stronger fit than stateless chat tools for assistants that need to remember users, preferences, and prior work across sessions.
- ✓Supports both cloud-hosted and self-hosted deployment according to the existing directory record, giving technical teams a path for managed usage or more direct infrastructure control.
- ✓Model-agnostic positioning allows teams to design around an agent memory layer instead of tying all context and behavior to a single LLM provider.
- ✓Its virtual context approach addresses a concrete limitation of LLM applications: important information can outlive the immediate context window instead of being lost between sessions.
- ✓The existing listing identifies 5 core feature areas, including persistent memory, virtual context, self-editing agents, document analysis beyond context limits, and multi-session conversation tracking.
- ✓Compared to broader agent frameworks in our directory, Letta has a clearer focus on long-running, stateful agents rather than general workflow orchestration.
Cons
- ✗The provided scraped website content did not expose complete current customer counts, founding year, or integration counts, so buyers should verify commercial details before procurement.
- ✗Persistent memory adds design and governance complexity because teams must decide what agents should store, retrieve, update, or forget over time.
- ✗Usage-based charges on the API Plan, including $0.10 per active agent per month and $0.00015 per second for server-side tool execution, can make costs harder to forecast for high-volume applications.
- ✗Self-hosted deployment can require engineering resources for installation, model provider configuration, monitoring, upgrades, and data management.
- ✗Letta is more specialized than broad frameworks like LangChain or Semantic Kernel, so teams that mainly need general tool orchestration may find its memory-first focus narrower.
Cognee - Pros & Cons
Pros
- ✓Graph-native memory beats flat vector RAG for structured questions
- ✓Multiple backend choices — no forced JVM, no forced vendor DB
- ✓Provenance chain makes memory auditable for regulated deployments
- ✓MCP server slots into modern agent runtimes with zero SDK work
- ✓Apache 2.0 with a real managed cloud when self-hosting the graph is too much
Cons
- ✗LLM extraction on ingest adds real per-document token cost
- ✗Setup for the fully self-hosted path involves multiple databases
- ✗Graph quality depends on extraction prompts — needs tuning for domain vocabularies
- ✗Smaller ecosystem than pure vector RAG stacks
- ✗Cloud pricing starts to matter quickly at higher ingest volumes
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