Compare frameworks
Pydantic AI vs Instructor
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 | Instructor |
|---|---|---|
| Stars | 20,220 (highest of the compared values)Synced from sourceCurrent2h ago | 13,951Synced from sourceCurrent2h ago |
| downloads | 3,076,771Synced from sourceStale1mo ago· past SLA | 13,080,962 (highest of the compared values)Synced from sourceStale1mo ago· past SLA |
| Last commit | 2026-09-28Synced from sourceCurrent2h ago | 2026-09-27Synced from sourceCurrent2h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago |
| Licence | MITSynced from sourceCurrent2h ago | MITSynced from sourceCurrent2h ago |
| Archived | noSynced from sourceCurrent2h ago | noSynced from sourceCurrent2h ago |
| Category | structured-outputSeeded, unreviewedwritten 1mo ago | structured-outputSeeded, unreviewedwritten 1mo ago |
| Contributors | 609Synced from sourceCurrent2h ago | 267Synced from sourceCurrent2h ago |
| Forks | 2796Synced from sourceCurrent2h ago | 1271Synced from sourceCurrent2h ago |
| Maintainer | PydanticSeeded, unreviewedwritten 1mo ago | 567 LabsSeeded, unreviewedwritten 1mo ago |
| Open issues | 1013Synced from sourceCurrent2h ago | 111Synced from sourceCurrent2h ago |
| PyPI downloads, monthly | 13478631Synced from sourceStale1mo ago· past SLA | 27671654Synced from sourceStale1mo ago· past SLA |
| PyPI downloads, weekly | 3076771Synced from sourceStale1mo ago· past SLA | 13080962Synced from sourceStale1mo ago· past SLA |
| PyPI package | pydantic-aiSynced from sourceCurrent2h ago | instructorSynced from sourceCurrent2h ago |
| PyPI released | 2026-09-25T23:32:17.554286ZSynced from sourceCurrent2h ago | 2026-09-09T02:25:54.888746ZSynced from sourceCurrent2h ago |
| Requires Python | >=3.10Synced from sourceCurrent2h ago | <4.0,>=3.9Synced from sourceCurrent2h ago |
| PyPI version | 2.51.0Synced from sourceCurrent2h ago | 1.17.0Synced from sourceCurrent2h ago |
| Repository | https://github.com/pydantic/pydantic-aiSynced from sourceCurrent2h ago | https://github.com/567-labs/instructorSynced from sourceCurrent2h ago |
Sources: GitHub REST API, npm registry downloads, PyPI registry metadata, pypistats.org downloads. Most recent observation 2h 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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