← All systems
Letta (MemGPT)
OrganizationLetta AI — UC Berkeley spinout
Founded2023 (paper) / 2024 (company)
Funding$10M seed (Felicis, ~$70M post), 2024-09
CodeApache-2.0 · 24.0k★
Agent-managed virtual context: the agent edits memory blocks and pages data between context and archival storage.
Every number on file
| claimed | benchmark | config | runner | status |
|---|---|---|---|---|
| 92.5 / 93.4 | DMR | GPT-4 / GPT-4-Turbo — differs by arXiv revision | self (paper) | SELF-REPORTED |
| 74.0 | LoCoMo | gpt-4o-mini + file tools + grep — no memory system | self (blog) | THIRD-PARTY |
Its filesystem-agent baseline (74.0) beat most 2025 vendor headlines — the load-bearing critique that LoCoMo is solvable with grep.
Rows are not comparable — configs differ. A row graduates to a verdict only through a registered re-run. The protocol →