Compare frameworks
Letta vs Pydantic AI vs LangGraph
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 | Letta | Pydantic AI | LangGraph |
|---|---|---|---|
| Stars | 24,864Synced from sourceCurrent3h ago | 20,133Synced from sourceCurrent3h ago | 42,201 (highest of the compared values)Synced from sourceCurrent3h ago |
| downloads | — | 3,076,771 (highest of the compared values)Synced from sourceStale1mo ago· past SLA | 2,342,174Synced from sourceCurrent3h ago |
| Last commit | 2026-09-10Synced from sourceCurrent3h ago | 2026-09-24Synced from sourceCurrent3h ago | 2026-09-23Synced from sourceCurrent3h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago |
| Licence | Apache-2.0Synced from sourceCurrent3h ago | MITSynced from sourceCurrent3h ago | MITSynced from sourceCurrent3h ago |
| Archived | noSynced from sourceCurrent3h ago | noSynced from sourceCurrent3h ago | noSynced from sourceCurrent3h ago |
| Category | memorySeeded, unreviewedwritten 1mo ago | structured-outputSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago |
| Contributors | 155Synced from sourceCurrent3h ago | 589Synced from sourceCurrent3h ago | 287Synced from sourceCurrent3h ago |
| Forks | 2628Synced from sourceCurrent3h ago | 2768Synced from sourceCurrent3h ago | 7139Synced from sourceCurrent3h ago |
| Maintainer | LettaSeeded, unreviewedwritten 1mo ago | PydanticSeeded, unreviewedwritten 1mo ago | LangChainSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | — | — | 12112794Synced from sourceCurrent3h ago |
| npm downloads, weekly | — | — | 2342174Synced from sourceCurrent3h ago |
| npm package | — | — | @langchain/langgraphSynced from sourceCurrent3h ago |
| npm window ends | — | — | 2026-09-21Synced from sourceCurrent3h ago |
| Open issues | 0Synced from sourceCurrent3h ago | 965Synced from sourceCurrent3h ago | 816Synced from sourceCurrent3h ago |
| PyPI downloads, monthly | — | 13478631Synced from sourceStale1mo ago· past SLA | — |
| PyPI downloads, weekly | — | 3076771Synced from sourceStale1mo ago· past SLA | — |
| PyPI package | lettaSynced from sourceCurrent3h ago | pydantic-aiSynced from sourceCurrent3h ago | langgraphSynced from sourceCurrent3h ago |
| PyPI released | 2026-09-23T23:59:05.225455ZSynced from sourceCurrent3h ago | 2026-09-24T03:23:01.147978ZSynced from sourceCurrent3h ago | 2026-09-21T14:43:28.196799ZSynced from sourceCurrent3h ago |
| Requires Python | >=3.9Synced from sourceCurrent3h ago | >=3.10Synced from sourceCurrent3h ago | >=3.10Synced from sourceCurrent3h ago |
| PyPI version | 0.33.0Synced from sourceCurrent3h ago | 2.49.0Synced from sourceCurrent3h ago | 1.2.12Synced from sourceCurrent3h ago |
| Repository | https://github.com/letta-ai/lettaSynced from sourceCurrent3h ago | https://github.com/pydantic/pydantic-aiSynced from sourceCurrent3h ago | https://github.com/langchain-ai/langgraphSynced from sourceCurrent3h ago |
Sources: GitHub REST API, npm registry downloads, PyPI registry metadata, pypistats.org downloads. Most recent observation 3h 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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