Ori-Mnemos
★ 306
vs
letta
★ 23.0k
Ori-Mnemos vs letta
Ori-Mnemos: Ori Mnemos is an open-source persistent memory infrastructure for AI agents that implements human cognition models on a knowledge graph. It uses ACT-R decay, spreading activation, and Hebbian learning to manage memory, and achieves state-of-the-art retrieval performance while being zero-infrastructure and portable.; letta: Letta is a powerful platform for building stateful AI agents equipped with advanced memory, enabling them to learn and self-improve over time. It provides both a command-line interface for local agent execution and a comprehensive API with Python and TypeScript SDKs for seamless integration into applications.
01
TL;DR
Choose Ori-Mnemos if…Multi-hop retrieval QA (e.g., HotpotQA)
Choose letta if…Running AI agents locally in your terminal for coding and general tasks.
02
Side-by-Side Comparison
03
Features
Ori-Mnemos01Persistent memory across sessions, clients, and machines
02Knowledge graph with wiki-links, PageRank, and community detection
03Three memory spaces with cognitive forgetting (ACT-R decay)
04Four-signal fusion retrieval (semantic, BM25, PageRank, warmth)
05Retrieval intelligence with Q-learning and meta-learning
letta01Build stateful AI agents with advanced memory
02Agents capable of learning and self-improvement over time
03CLI tool for running agents locally in your terminal
04Comprehensive API for integrating agents into applications
05Support for skills and subagents; fully model-agnostic
04
Use Cases
Ori-Mnemos↳Multi-hop retrieval QA (e.g., HotpotQA)
↳Long-term conversational memory (e.g., LoCoMo)
↳Persistent AI agent identity and knowledge
letta↳Running AI agents locally in your terminal for coding and general tasks.
↳Integrating stateful AI agents into custom applications using the API and SDKs.
↳Developing self-improving AI systems that adapt and learn continually.
05
Best For
Ori-MnemosMemory & ContextRAG / Knowledge Base
lettaMost PopularTrendingEssential
FAQ
FAQ
What is the difference between Ori-Mnemos and letta?
Both Ori-Mnemos and letta are in the Memory & Context category. Ori-Mnemos has 306 stars, while letta has 23.0k stars.
Which is better, Ori-Mnemos or letta?
The best choice depends on your use case. Choose Ori-Mnemos if Multi-hop retrieval QA (e.g., HotpotQA), and letta if Running AI agents locally in your terminal for coding and general tasks..
Is Ori-Mnemos free or open source?
Yes, Ori-Mnemos is open source on GitHub (Apache-2.0).
Is letta free or open source?
Yes, letta is open source on GitHub (Apache-2.0).
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