Pydantic AI vs smolagents
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose Pydantic AI if you want type-safe python framework for building production ai agents (Supervised agent, free); choose smolagents if you want minimalist open-source library for agents that think in code (Supervised agent, free).
| Pydantic AI | smolagents | |
|---|---|---|
| What it is | Type-safe Python framework for building production AI agents | Minimalist open-source library for agents that think in code |
| Type | framework | framework |
| Autonomy | Supervised agent | Supervised agent |
| Pricing | free · Free (open source; pay underlying model usage) | free · Free (open source; pay model + sandbox usage) |
| Best for | developers | developers |
| Deployment | self-hosted, api | self-hosted, api |
| Modalities | text, code, api | text, code, image |
| Models | model-agnostic | model-agnostic, open-source |
| Protocols | mcp, function-calling, rest-api | mcp, function-calling, rest-api |
| Integrations | OpenAI, Anthropic, Google Gemini, Mistral, Amazon Bedrock, Ollama | Hugging Face Hub, LiteLLM, Ollama, E2B, Modal, Docker |
| Capabilities | 3 documented | 4 documented |
Pydantic AI
- +Strong type safety and schema-validated outputs from the Pydantic team
- +Built-in reflection and self-correction on invalid output
- +Model-agnostic across most major providers; integrates with Logfire observability
- -Python-only
- -A framework, not a product: you build, host, and secure your agents
smolagents
- +Tiny, transparent core (~1,000 lines) that is easy to read and extend
- +Code-as-action approach enables natural composability
- +Model-agnostic, multimodal, with sandboxed execution and Hub sharing
- -Minimalist by design: fewer batteries-included features than larger frameworks
- -A framework, not a product: you build, host, and secure agents yourself
Which should you choose?
Pydantic AI is type-safe python framework for building production ai agents, best for developers. smolagents is minimalist open-source library for agents that think in code, best for developers. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.