Letta vs 
SWE-agent
Letta vs SWE-agent compared for 2026 — features, license, ease of use, performance and which one to choose. Stateful agents with long-term memory vs Agent that fixes GitHub issues.
Updated regularly · curated by OpenSourceAI.tech
Letta vs SWE-agent at a glance
| Spec | Letta | SWE-agent |
|---|---|---|
| Category | AI agent framework | AI agent framework |
| Type | Agent runtime (memory) | Autonomous issue-fixing agent |
| License | Apache-2.0 | MIT |
| Runs locally | Self-hosted | Cloud-optional |
| Primary language | Python | Python |
| Ease of use | Advanced | Advanced |
| Best for | agents that remember across sessions | automated bug fixing on real repos |
| GitHub stars | 24k | 20k |
How Letta and SWE-agent score
| Criterion | Letta | SWE-agent |
|---|---|---|
| Popularity | 3.5 | 3.5 |
| Maintenance | 5.0 | 5.0 |
| Ease of use | 2.5 | 2.5 |
| Privacy | 4.5 | 3.5 |
| License freedom | 5.0 | 5.0 |
Scores are computed automatically from public signals — GitHub stars (popularity), recent commit activity (maintenance), license type (freedom), local-first design (privacy) and onboarding complexity (ease of use). Indicative, not a verdict.
What each one is
Letta
Letta (formerly MemGPT) is a framework and server for building stateful agents with long-term memory that persists across sessions, with a visual agent editor.
- Persistent long-term agent memory
- Server with REST API and visual editor
- Model-agnostic and self-hostable
SWE-agent
SWE-agent from Princeton turns an LLM into an autonomous agent that fixes bugs in real GitHub repositories using a purpose-built agent-computer interface.
- Strong results on SWE-bench
- Purpose-built agent-computer interface
- Research-grade and reproducible
Key differences
Letta is agent runtime (memory), while SWE-agent is autonomous issue-fixing agent. Their licenses differ (Apache-2.0 vs MIT), which matters if you ship a commercial product. They also differ in how they run (Self-hosted vs Cloud-optional). In short, Letta fits agents that remember across sessions, and SWE-agent fits automated bug fixing on real repos.
Which should you choose?
Choose Letta for agents that remember across sessions. Choose SWE-agent for automated bug fixing on real repos.
There is rarely one winner — many setups use both. The right pick depends on your hardware, your team's skills, and whether you value simplicity or control.
Frequently asked questions
Is Letta or SWE-agent easier to use?
Both sit at a similar level (Advanced). Your choice should come down to fit rather than difficulty.
Are Letta and SWE-agent free?
Letta is free and open source (Apache-2.0), and SWE-agent is free and open source (MIT). Neither charges for the core software.
Can I run Letta and SWE-agent locally?
Letta: self-hosted · SWE-agent: cloud-optional. Both can be used without sending your data to a third-party cloud where their setup allows.
Letta vs SWE-agent — which should I pick in 2026?
Choose Letta for agents that remember across sessions. Choose SWE-agent for automated bug fixing on real repos.
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