smolagents vs Letta
Detailed side-by-side comparison to help you choose the right tool
smolagents
🔴DeveloperAgent Framework
Minimalist agent framework from Hugging Face where the agent writes and executes Python code as its actions.
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FreeLetta
🔴DeveloperAgent Framework
Stateful agent framework and cloud from the MemGPT team — agents that actually remember across sessions.
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FreeFeature Comparison
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smolagents - Pros & Cons
Pros
- ✓Small abstraction layer is inspectable
- ✓Code actions compose several operations
- ✓Model- and tool-agnostic design
- ✓Apache 2.0 permits commercial modification
Cons
- ✗Model-written code demands sandboxing
- ✗Teams own deployment and observability
- ✗Adapters require version-aware maintenance
- ✗Code agents are harder to govern than narrow schemas
Letta - Pros & Cons
Pros
- ✓Persistent, editable memory is built into the agent runtime
- ✓ADE exposes agent state and tool calls for debugging
- ✓Python, TypeScript, REST, multiple model providers, and MCP offer flexible integration
- ✓Open-source self-hosting avoids mandatory platform lock-in
Cons
- ✗Stateful agents add privacy, retention, deletion, and migration responsibilities
- ✗Cloud plan and model usage can create separate cost layers
- ✗Memory quality still depends on prompts, models, and application-specific evaluation
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