Letta alternatives
3 substitutes · 3 in agents · 0 adjacent
The short answer
3 tools on this index are recorded as a substitute for Letta. 3 of these run the same way you already deploy Letta (self-hosted), and 2 are permissively licensed, so they do not change what you can ship. All of them sit in Agent Frameworks, so the choice is a real one rather than a category change. There is no overall winner here: which one is right depends on traffic shape, operational budget and how much of Letta you have already built around.
By Lattice editorial · Comparison reviewed · method
Real substitutes
in Agent Frameworks- Claude Agent SDKframework · proprietary
Anthropic's toolkit for building agents with tool use and hooks.
Use when Building agents against Anthropic models, with tool use and hooks.
Skip when You need provider independence at the framework layer.
- smolagentsframework · Apache-2.0
Minimal code-first agent loop from the Hugging Face team.
Use when Reading the whole agent loop in a page — it is deliberately tiny.
Skip when You need a rich tool ecosystem around it.
- OpenAI Agents SDKframework · Apache-2.0
Lightweight primitives for handoffs, guardrails and tracing.
Use when A small, legible set of primitives for handoffs and guardrails.
Skip when You need multi-provider abstraction at every layer.
This graph is bidirectional and unsponsored. A tool appears here if Letta or another entry names it as a substitute, and Claude Agent SDK, smolagents and OpenAI Agents SDK point at Letta as well. How this index is compiled — including where it is wrong.