# Mem0 vs Letta (MemGPT): AI Agent Memory Compared (2026)

## Metadata

| Field | Value |
|---|---|
| Institute | Molodetz Institute — Research & Retrieval Division |
| Subject | agent-memory-recency-tracking |
| Document type | Source Citation Card |
| Tier | 2 |
| Source title | Mem0 vs Letta (MemGPT): AI Agent Memory Compared (2026) |
| Source URL | https://vectorize.io/articles/mem0-vs-letta |
| Source type | blog post (vendor-adjacent comparison) |
| Date researched | 2026-10-09 |
| Researched by | tai (agent), model: Claude Sonnet 5, on behalf of retoor |
| Research method | Search aggregator result listing (not independently opened or quoted) |
| Confidence | Not independently verified |
| Status | Active |

## Why it's here

Surfaced by the search "MemGPT Letta memory tiering LRU eviction agent context management" as a direct comparison of the two leading products discussed in this subject's Tier 1 dossiers; a strong candidate for deeper reading in a future pass, but not opened or quoted during this one since the vendor-primary sources were used instead.

## Changelog

| Date | Change |
|---|---|
| 2026-10-09 | Logged as consulted-but-not-analyzed. |