Letta
Letta (formerly MemGPT) is the open source framework for building AI agents with persistent memory. Unlike standard LLM applications that forget context between sessions, Letta agents remember users, learn over time, and maintain state across conversations. It originated from groundbreaking research at UC Berkeley on memory management for LLMs.
- Location
- San Francisco, USA
- Raised
- $10M
- Stage
- Seed
- Founded
- 2023
- Category
- AI
- Funding
- VC-backed
- Team
- 10–50
Funding figures as of Jul 2025 · not independently verified
Founders of Letta
- Charles Packer
- Sarah Wooders
Investors backing Letta
- a16z
- Jeff Dean
- Yann LeCun
Frequently asked questions
What does Letta do?
Letta (formerly MemGPT) is the open source framework for building AI agents with persistent memory. Unlike standard LLM applications that forget context between sessions, Letta agents remember users, learn over time, and maintain state across conversations. It originated from groundbreaking research at UC Berkeley on memory management for LLMs.
Where is Letta based?
Letta is based in San Francisco, USA.
When was Letta founded?
Letta was founded in 2023.
How much has Letta raised?
Letta has raised $10M in their Seed round as of Jul 2025.
Who founded Letta?
Letta was founded by Charles Packer, Sarah Wooders.
Who has invested in Letta?
Letta is backed by a16z, Jeff Dean, Yann LeCun.
How Letta would pitch themselves
○ Auto-generated01Target customer
AI agents — the core audience Letta's product is built around.
02Problem they solve
Letta (formerly MemGPT) is the open source framework for building AI agents with persistent memory. Unlike standard LLM applications that forget context between sessions, Letta agents remember users, learn over time, an… The category has historically been served by tools that miss the modern workflow this product is built around.
03Key differentiator
Letta differentiates on memory-first infrastructure for ai agents. Backed by a16z + Jeff Dean, $10M raised — the company has resources + validation to compound this thesis. Founded by Charles Packer + team.
04Go-to-market strategy
Early-stage GTM — typically product-led growth (free tier or low-friction onboarding) paired with founder-led sales for the first 100 customers. Heavy content marketing + community presence on Twitter/X, LinkedIn, and category-specific Slack groups.