Compare frameworks
Pydantic AI vs LangGraph vs Vercel AI SDK
Every figure below carries the source that reported it and the moment it was observed. Values that failed validation are withheld rather than shown, and a dash means no source we track carries that field for that framework.
| Field | Pydantic AI | LangGraph | Vercel AI SDK |
|---|---|---|---|
| Stars | 20,133Synced from sourceCurrent4h ago | 42,201 (highest of the compared values)Synced from sourceCurrent4h ago | 26,922Synced from sourceCurrent4h ago |
| downloads | 3,076,771Synced from sourceStale1mo ago· past SLA | 2,342,174Synced from sourceCurrent4h ago | 17,883,737 (highest of the compared values)Synced from sourceCurrent4h ago |
| Last commit | 2026-09-24Synced from sourceCurrent4h ago | 2026-09-23Synced from sourceCurrent4h ago | 2026-09-24Synced from sourceCurrent4h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | typescriptSeeded, unreviewedwritten 1mo ago |
| Licence | MITSynced from sourceCurrent4h ago | MITSynced from sourceCurrent4h ago | — |
| Archived | noSynced from sourceCurrent4h ago | noSynced from sourceCurrent4h ago | noSynced from sourceCurrent4h ago |
| Category | structured-outputSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago |
| Contributors | 589Synced from sourceCurrent4h ago | 287Synced from sourceCurrent4h ago | 715Synced from sourceCurrent4h ago |
| Forks | 2768Synced from sourceCurrent4h ago | 7139Synced from sourceCurrent4h ago | 5180Synced from sourceCurrent4h ago |
| Maintainer | PydanticSeeded, unreviewedwritten 1mo ago | LangChainSeeded, unreviewedwritten 1mo ago | VercelSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | — | 12112794Synced from sourceCurrent4h ago | 87791075Synced from sourceCurrent4h ago |
| npm downloads, weekly | — | 2342174Synced from sourceCurrent4h ago | 17883737Synced from sourceCurrent4h ago |
| npm package | — | @langchain/langgraphSynced from sourceCurrent4h ago | aiSynced from sourceCurrent4h ago |
| npm window ends | — | 2026-09-21Synced from sourceCurrent4h ago | 2026-09-21Synced from sourceCurrent4h ago |
| Open issues | 965Synced from sourceCurrent4h ago | 816Synced from sourceCurrent4h ago | 1462Synced from sourceCurrent4h ago |
| PyPI downloads, monthly | 13478631Synced from sourceStale1mo ago· past SLA | — | — |
| PyPI downloads, weekly | 3076771Synced from sourceStale1mo ago· past SLA | — | — |
| PyPI package | pydantic-aiSynced from sourceCurrent4h ago | langgraphSynced from sourceCurrent4h ago | — |
| PyPI released | 2026-09-24T03:23:01.147978ZSynced from sourceCurrent4h ago | 2026-09-21T14:43:28.196799ZSynced from sourceCurrent4h ago | — |
| Requires Python | >=3.10Synced from sourceCurrent4h ago | >=3.10Synced from sourceCurrent4h ago | — |
| PyPI version | 2.49.0Synced from sourceCurrent4h ago | 1.2.12Synced from sourceCurrent4h ago | — |
| Repository | https://github.com/pydantic/pydantic-aiSynced from sourceCurrent4h ago | https://github.com/langchain-ai/langgraphSynced from sourceCurrent4h ago | https://github.com/vercel/aiSynced from sourceCurrent4h ago |
Sources: GitHub REST API, npm registry downloads, PyPI registry metadata, pypistats.org downloads. Most recent observation 4h ago. Where a row is marked, ▲ is the highest of the values shown and ▼ the lowest — arithmetic on the figures above, not a ranking or a recommendation. Rows where neither extreme is meaningful are left unmarked rather than given a direction they do not have.
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