Letta · Letta (formerly MemGPT, UC Berkeley spinout)
Apache-2.0 platform for stateful agents descended from MemGPT, distinguished by tiered self-editing memory persisted in a database (core memory in-context, archival out-of-context) plus 2026 research on git-based 'Context Repositories' and memory-native RL; in 2026 the company is consolidating around Letta Code, an open, model-agnostic memory-first coding agent harness (LettaBot archived May 2026 and folded in as Channels).
Identity
| Homepage | https://www.letta.com |
|---|---|
| Repository | https://github.com/letta-ai/letta |
| License | open-source |
| Domain | general |
| Form factor | sdk · cloud-service · cli · web-app |
Model support
| Model-agnostic | ✓ yes |
|---|---|
| Native models | — |
| Local models | ✓ yes |
| Pricing | freemium |
Extensibility
| MCP client | ✓ yes |
|---|---|
| Agent Skills support | ? unknown |
| Plugins / hooks | ✓ yes |
Execution & safety
| Sandboxing | optional |
|---|---|
| Autonomy spectrum | supervised → semi-autonomous → autonomous-local → background-cloud |
| Subagents | ✓ yes |
| Parallel sessions | ✓ yes |
| Context management | compaction · persistent-memory |
Integration & evidence
| Headless / API | ✓ yes |
|---|---|
| GitHub integration | ? unknown |
| Sources |
✓ profile last verified 2026-07-08 · benchmark figures are vendor-reported unless a source states otherwise