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Letta (MemGPT)

4.5/5Free / Open Source
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An open-source framework for building stateful AI agents with long-term memory (formerly MemGPT). Letta lets agents remember, learn and manage their own memory over time, so they improve across conversations instead of forgetting.

What is Letta (MemGPT)?

An open-source framework for building stateful AI agents with long-term memory (formerly MemGPT). Letta lets agents remember, learn and manage their own memory over time, so they improve across conversations instead of forgetting.

Letta (MemGPT) sits in the agents category and is listed in the AIverse AI tools directory, where it holds an editorial rating of 4.5 out of 5 based on its capabilities, usability, value for money and reliability. It is developed by Letta, founded in 2023.

Letta (MemGPT) features and use cases

People typically use Letta (MemGPT) for Long-lived AI assistants, Agents that learn over time, Personalized companions and Memory-heavy applications.

It is often associated with Open Source, Memory, Stateful Agents and Framework. Developers can integrate Letta (MemGPT) into their own products through its API.

Letta (MemGPT) pricing

Letta (MemGPT) is completely free (Free / Open Source). You can use it without a subscription.

As with any AI tool, the right plan depends on how heavily you use it. We recommend trying Letta (MemGPT) before committing to a paid plan.

Is Letta (MemGPT) worth it? Our bottom line

Overall, Letta (MemGPT) is a strong choice in the agents category for 2026. Its standout strengths include Stateful agents with long-term memory and Agents manage their own memory. Bear in mind For developers and More complex than stateless bots. If it matches your workflow, Letta (MemGPT) is well worth a try — especially since you can start for free.

✅ Our verdict

Letta (formerly MemGPT) is the go-to open-source framework for stateful agents with real long-term memory: agents that remember and improve instead of resetting each chat. Ideal for developers building assistants meant to last and personalize.

👍 Pros

  • +Stateful agents with long-term memory
  • +Agents manage their own memory
  • +Improves over time
  • +Open source and free
  • +Pioneered by the MemGPT research

👎 Cons

  • −For developers
  • −More complex than stateless bots
  • −Setup and tuning
  • −Newer ecosystem

🎯 Use cases

Long-lived AI assistantsAgents that learn over timePersonalized companionsMemory-heavy applications

ℹ️ Key facts

Company
Letta
Founded
2023
API
Yes

Last updated: Aug 2026

4.5
Rating
11.0k
Views
Free
Pricing

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An open-source framework for building stateful AI agents with long-term memory (formerly MemGPT). Letta lets agents remember, learn and manage their own memory over time, so they improve across conversations instead of forgetting.

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❓ Frequently Asked Questions

Is Letta (MemGPT) free?

Yes, Letta (MemGPT) is completely free to use, with no paid plan required to access its core features.

What is Letta (MemGPT) used for?

Letta (MemGPT) is an AI AI agent tool. An open-source framework for building stateful AI agents with long-term memory (formerly MemGPT). Letta lets agents remember, learn and manage their own memory over time, so they improve across conversations instead of forgetting. It currently holds a 4.5/5 rating on Aiverse from real users.

Is Letta (MemGPT) worth it in 2026?

Yes — Letta (MemGPT) holds a strong 4.5/5 rating on Aiverse, making it one of the top-rated AI agent tools in 2026. It's a solid pick if it matches your use case.