Letta

Framework for agents with long-term memory.

Verified live · 7/11/2026

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What is Letta?

An open-source framework (formerly MemGPT) for building stateful agents with persistent long-term memory. Includes a server and agent development environment for memory-centric agents.

Pros

Advanced memory management
Stateful agents
Research pedigree

Cons

Memory-focused niche
Evolving from MemGPT

Pricing

From Free · Open source

Top Letta alternatives

Agno — Fast, lightweight framework for multimodal agents.
CrewAI — Framework for orchestrating role-playing agent crews.
DSPy — Framework for programming, not prompting, LLMs.
Griptape — Python framework for agents, pipelines, and workflows.
Haystack — Open-source framework for LLM search and agents.
LangChain — Popular framework for building LLM apps and agents.

See the full Letta alternatives guide →