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MemGPT's company and OSS agent memory runtime. GitHub letta-ai/letta is ~20.5k stars. Cloud is $20 and $200 per project plus usage.

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Letta

Letta is the company and runtime behind MemGPT-style stateful agents. letta-ai/letta is Apache-2.0 and showed about 20,488 stars. The old "Free + paid, unspecified" cloud line is stale.

Compare LangGraph if you wanted a graph, and Langfuse if you only needed traces.

Key Features

  • Memory blocks: Core in-context memory plus external store, still the product idea.
  • Self-host: Docker / OSS server remains documented.
  • Letta Cloud: Hosted ADE and agents, billed per project.
  • Not just a paper demo: Treat MemGPT as the origin story, not the SKU name.

Use Cases

  • Companions and support bots that must remember a user across weeks.
  • Teams that will self-host Postgres-backed memory.
  • People comparing $20/project vs LangSmith $39/seat.

Limitation: included usage on Pro/Max was not fully copied. Confirm the meter. Sleep-time compute should be confirmed in current docs.

Pricing

letta.com/pricing on 2026-08-17:

Plan Price Notes from that page
Free $0 Limited cloud / OSS self-host.
Pro $20 / project / month Then usage.
Max $200 / project / month Higher included usage.
Enterprise Custom Sales.

Getting Started

  1. Read docs.letta.com.
  2. docker the OSS server, or create a Free cloud project.
  3. Create one agent with a memory block before you buy Pro.
  4. Confirm whether you are paying per project or per seat. The page we used is per project.

Frequently Asked Questions

Is it still called MemGPT?

The company is Letta. MemGPT is the paper / history.

20k stars still right?

About 20,488 on 2026-08-17.

Cloud still "contact us"?

No. $20 and $200 per project are public.

Alternatives

Tips

  1. Quote $20 / $200 per project, not "cloud paid tiers".
  2. Keep the GitHub star count dated.
  3. Confirm ADE vs API. They are one product with two doors.

Conclusion

Letta is still the MemGPT memory runtime, now with a public $0 / $20 / $200 cloud grid and ~20k GitHub stars. Start at letta.com/pricing or docs.letta.com.

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