Pydantic AI vs LangGraph vs Mastra vs OpenAI Agents SDK
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Pydantic AI
Type-safe Python agent framework built by the Pydantic team
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LangGraph
Open-source graph framework for durable, stateful AI agents
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OpenAI Agents SDK
OpenAI's minimal Python framework for agent handoffs, not graphs.
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| RECATOOLS Score | 8.2 / 10 | 8.3 / 10 | 8 / 10 | 8 / 10 |
| Capability | ||||
| Value for money | ||||
| Ease of use | ||||
| ASEAN readiness | ||||
| API quality | ||||
| Pricing | Open Source | Freemium | Freemium | Open Source |
| Free tier | — | — | — | — |
| Paid from | — | — | — | — |
| Has API | ✓ | ✓ | ✓ | ✓ |
| Open source | ✓ | ✓ | ✓ | ✓ |
| Free to use | ✓ | ✓ | ✓ | ✓ |
| Users | — | — | — | — |
| Founded | — | — | — | — |
| Maker | — | — | — | — |
| Verdict | Pydantic AI is the agent framework built by the team whose validation library already sits inside the OpenAI, Anthropic and Google SDKs, and that pedigree shows: structured output validation and dependency-injected testi... |
LangGraph has genuine production mileage that most agent frameworks can only cite in a blog post: Klarna's customer-support assistant runs on it at 85 million users, Replit Agent's multi-step app-building flow is built o... |
Mastra filled a real gap — a first-class TypeScript agent framework instead of a Python port — and adoption backs that up: 22,000-plus GitHub stars, 300,000-plus weekly npm downloads, and production users spanning Replit... |
OpenAI's Agents SDK is the deliberately small option in a field of increasingly elaborate agent frameworks: a handoff pattern with guardrails and tracing gets you a working multi-agent setup in well under 100 lines, whic... |
| Full review → | Full review → | Full review → | Full review → |
Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.