Registry › Compare › PydanticAI vs Vercel AI SDK

PydanticAI vs Vercel AI SDK

Both are Grade A and 4.6 points apart, so choose on what you weigh most. PydanticAI leads on supply-chain integrity and transparency; Vercel AI SDK leads on adoption.

A PydanticAI 88.3

How Python does AI. Agents, realtime voice, image generation, embeddings. Every model, every interface, typed end to end.

pydantic/pydantic-ai · #39 overall · #8 Agent Frameworks · coverage A (4/5)

Choose PydanticAI if supply-chain integrity and transparency matter most.

+0.9Safety / Integrity: OSSF Scorecard 5.9 against 5.2
+0.6Transparency: OSSF Scorecard 5.9 against 5.2

A Vercel AI SDK 92.9

The AI Toolkit for TypeScript. From the creators of Next.js, the AI SDK is a free open-source library for building AI-powered applications and agents

vercel/ai · #6 overall · #4 Agent Frameworks · coverage A (4/5)

Choose Vercel AI SDK if adoption matters most.

+1.5Adoption: 30.8M weekly downloads against 1.4M

Where they differ

19.9

Safety / IntegrityPydanticAI +0.9

19.0

13.5

TransparencyPydanticAI +0.6

12.9

18.5

AdoptionVercel AI SDK +1.5

20.0

-1.6

Runtime calibrationVercel AI SDK +4.6

+3.0

2 dimensions identical: Identity 18.0 · Maintenance 20.0 · Full evidence table

An independent, evidence-based trust comparison of PydanticAI and Vercel AI SDK, two Agent Frameworks projects in the HVTracker registry. Scores come from public, checkable signals — supply-chain provenance, OSSF Scorecard, maintenance, and adoption — not popularity.

Full evidence

Signal	PydanticAIpydantic/pydantic-ai	Vercel AI SDKvercel/ai
HVTrust score	88.3	92.9
Evidence grade	A	A
Coverage grade	A	A
Overall rank	#39	#6
Rank in Agent Frameworks	#8	#4
GitHub stars	20.6k	27.3k
Last updated	today	today
Build provenance	Yes	Yes
OSSF Scorecard	5.9 / 10	5.2 / 10
License	MIT	NOASSERTION
Downloads	1.4M/wk	30.8M/wk
Trust dimensions (points earned)
Safety / integrity / 25	19.9	19.0
Identity & provenance / 18	18.0	18.0
Transparency / 17	13.5	12.9
Maintenance / 20	20.0	20.0
Adoption / 20	18.5	20.0
Runtime capability surface (full matrix)
MCP server	Declared	Implemented
External providers	8 — Amazon Bedrock, Anthropic, Cohere, …	1 — OpenAI
Requires API keys	No	No
Plugin surface	plugins	—
Provenance drift	Match	Match

Open in the live compare tool → PydanticAI profile Vercel AI SDK profile More Agent Frameworks →

How to read this: HVTrust (0–100) weighs supply-chain signals (provenance, OSSF Scorecard, signed commits, open license) alongside real-world adoption, scaled by an evidence-confidence factor. Grade bands: A ≥ 80, B ≥ 65, C ≥ 50, D < 50. Signals refresh daily. Full methodology v4.4 →