# Cognee vs Letta (MemGPT): 2026 Empirical Benchmark & Cost Shootout

> **Direct Answer (October 2026 Verdict)**: Cognee wins on modular Extract-Cognify-Load (ECL) graph+vector pipelines that plug into any existing agent (93.0), while Letta wins on OS-style self-editing core/archival memory tiers and stateful agent servers (92.0).

- **Category**: ECL Graph-Vector Memory vs OS-Style Stateful Agent Runtime
- **Canonical URL**: https://exactbaseline.com/vs/cognee-vs-letta
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## Cognee Key Advantages
- 32.3k+ GitHub stars; replaces brittle chunk-RAG with deterministic graph + vector cognify pipelines
- Runs locally with small open-weight models and integrates with 30+ data sources
- Lightweight Python SDK embeds directly inside FastAPI, LangGraph, or PydanticAI

## Letta (MemGPT) Key Advantages
- 25.1k+ GitHub stars; pioneered OS-inspired virtual context management (core vs archival memory)
- Agents autonomously call memory-edit tools to update their own persona and long-term facts
- Full REST server with multi-agent shared memory blocks and ADE visual debugger