Pydantic AI vs Agno
Agno is a Python agent framework that optimizes for breadth: a very large tool catalogue, teams, step workflows, and AgentOS to run and watch them. Pydantic AI gives you that breadth on a typed core with strict Pydantic validation: capabilities and the Harness SDK for the batteries, sub-agents for teams, pydantic-graph for workflows, and Pydantic Logfire to run and watch them.
Pydantic AI is one part of a stack: the Harness SDK for capabilities and complete agents, Pydantic Evals for evaluation, Pydantic Graph for graph-based workflows, Pydantic Logfire for observability, and Pydantic itself for validation. The tables below cover the whole of it.
Already built on Agno? The migrating-agno-to-pydantic-ai skill ports an existing application to Pydantic AI one working path at a time, preserving behavior rather than translating API names.
| Agno | Pydantic AI and Harness SDK | |
|---|---|---|
| Language | Python | Python |
| License | Apache-2.0 | MIT |
| Model providers | Many | Many |
| Extensibility | Tools, toolkits | Capabilities and toolsets; 50+ with the Harness SDK |
| Harnesses | Build your own | Built-in Coder and Researcher, or compose your own |
| Observability | OpenTelemetry | OpenTelemetry, including Pydantic Logfire |
| Durable execution | Yes | Seven integrations |
| Interfaces | AG-UI, A2A, chat platforms | CLI, web chat, AG-UI, Vercel AI, ACP (experimental), GitHub Agentic Workflows |
| Realtime voice | No | Realtime |
| Evals | Yes | Pydantic Evals |
| Image generation | Yes | Image Generation |
| Agno | Pydantic AI and Harness SDK | |
|---|---|---|
| Multi-agent | Yes | Subagents, delegation, or pydantic-graph |
| Planning | Teams only | Planning |
| Skills | Yes | Skills |
| Memory | Yes | Memory |
| Compaction | History window, session summaries | Compaction |
| Guardrails | Yes | Guardrails |
| Code sandboxes | Yes | Execution environments |
| Browser use | Yes | Web & research |