Compare frameworks
Instructor vs Pydantic AI vs LangChain
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 | Instructor | Pydantic AI | LangChain |
|---|---|---|---|
| Stars | 13,951Synced from sourceCurrent4h ago | 20,220Synced from sourceCurrent4h ago | 147,178 (highest of the compared values)Synced from sourceCurrent4h ago |
| downloads | 13,080,962 (highest of the compared values)Synced from sourceStale1mo ago· past SLA | 3,076,771Synced from sourceStale1mo ago· past SLA | 3,201,198Synced from sourceCurrent4h ago |
| Last commit | 2026-09-27Synced from sourceCurrent4h ago | 2026-09-28Synced from sourceCurrent4h ago | 2026-09-27Synced from sourceCurrent4h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago |
| Licence | MITSynced from sourceCurrent4h ago | 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 | structured-outputSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago |
| Contributors | 267Synced from sourceCurrent4h ago | 609Synced from sourceCurrent4h ago | 3741Synced from sourceCurrent4h ago |
| Forks | 1271Synced from sourceCurrent4h ago | 2796Synced from sourceCurrent4h ago | 24634Synced from sourceCurrent4h ago |
| Maintainer | 567 LabsSeeded, unreviewedwritten 1mo ago | PydanticSeeded, unreviewedwritten 1mo ago | LangChainSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | — | — | 10682493Synced from sourceCurrent4h ago |
| npm downloads, weekly | — | — | 3201198Synced from sourceCurrent4h ago |
| npm package | — | — | langchainSynced from sourceCurrent4h ago |
| npm window ends | — | — | 2026-09-26Synced from sourceCurrent4h ago |
| Open issues | 111Synced from sourceCurrent4h ago | 1013Synced from sourceCurrent4h ago | 569Synced from sourceCurrent4h ago |
| PyPI downloads, monthly | 27671654Synced from sourceStale1mo ago· past SLA | 13478631Synced from sourceStale1mo ago· past SLA | — |
| PyPI downloads, weekly | 13080962Synced from sourceStale1mo ago· past SLA | 3076771Synced from sourceStale1mo ago· past SLA | — |
| PyPI package | instructorSynced from sourceCurrent4h ago | pydantic-aiSynced from sourceCurrent4h ago | langchainSynced from sourceCurrent4h ago |
| PyPI released | 2026-09-09T02:25:54.888746ZSynced from sourceCurrent4h ago | 2026-09-25T23:32:17.554286ZSynced from sourceCurrent4h ago | 2026-09-18T17:31:10.056247ZSynced from sourceCurrent4h ago |
| Requires Python | <4.0,>=3.9Synced from sourceCurrent4h ago | >=3.10Synced from sourceCurrent4h ago | <4.0.0,>=3.10.0Synced from sourceCurrent4h ago |
| PyPI version | 1.17.0Synced from sourceCurrent4h ago | 2.51.0Synced from sourceCurrent4h ago | 1.4.2Synced from sourceCurrent4h ago |
| Repository | https://github.com/567-labs/instructorSynced from sourceCurrent4h ago | https://github.com/pydantic/pydantic-aiSynced from sourceCurrent4h ago | https://github.com/langchain-ai/langchainSynced 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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