Compare frameworks
Letta 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 | Letta | LangGraph | Vercel AI SDK |
|---|---|---|---|
| Stars | 24,923Synced from sourceCurrent5h ago | 42,384 (highest of the compared values)Synced from sourceCurrent5h ago | 27,001Synced from sourceCurrent5h ago |
| downloads | — | 3,773,725Synced from sourceCurrent5h ago | 29,813,554 (highest of the compared values)Synced from sourceCurrent5h ago |
| Last commit | 2026-09-10Synced from sourceCurrent5h ago | 2026-09-27Synced from sourceCurrent5h ago | 2026-09-28Synced from sourceCurrent5h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | typescriptSeeded, unreviewedwritten 1mo ago |
| Licence | Apache-2.0Synced from sourceCurrent5h ago | MITSynced from sourceCurrent5h ago | — |
| Archived | noSynced from sourceCurrent5h ago | noSynced from sourceCurrent5h ago | noSynced from sourceCurrent5h ago |
| Category | memorySeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago | orchestrationSeeded, unreviewedwritten 1mo ago |
| Contributors | 155Synced from sourceCurrent5h ago | 287Synced from sourceCurrent5h ago | 719Synced from sourceCurrent5h ago |
| Forks | 2631Synced from sourceCurrent5h ago | 7174Synced from sourceCurrent5h ago | 5207Synced from sourceCurrent5h ago |
| Maintainer | LettaSeeded, unreviewedwritten 1mo ago | LangChainSeeded, unreviewedwritten 1mo ago | VercelSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | — | 12375862Synced from sourceCurrent5h ago | 92989638Synced from sourceCurrent5h ago |
| npm downloads, weekly | — | 3773725Synced from sourceCurrent5h ago | 29813554Synced from sourceCurrent5h ago |
| npm package | — | @langchain/langgraphSynced from sourceCurrent5h ago | aiSynced from sourceCurrent5h ago |
| npm window ends | — | 2026-09-26Synced from sourceCurrent5h ago | 2026-09-26Synced from sourceCurrent5h ago |
| Open issues | 0Synced from sourceCurrent5h ago | 831Synced from sourceCurrent5h ago | 1450Synced from sourceCurrent5h ago |
| PyPI package | lettaSynced from sourceCurrent5h ago | langgraphSynced from sourceCurrent5h ago | — |
| PyPI released | 2026-09-28T04:32:31.896015ZSynced from sourceCurrent5h ago | 2026-09-21T14:43:28.196799ZSynced from sourceCurrent5h ago | — |
| Requires Python | >=3.9Synced from sourceCurrent5h ago | >=3.10Synced from sourceCurrent5h ago | — |
| PyPI version | 0.33.5Synced from sourceCurrent5h ago | 1.2.12Synced from sourceCurrent5h ago | — |
| Repository | https://github.com/letta-ai/lettaSynced from sourceCurrent5h ago | https://github.com/langchain-ai/langgraphSynced from sourceCurrent5h ago | https://github.com/vercel/aiSynced from sourceCurrent5h ago |
Sources: GitHub REST API, npm registry downloads, PyPI registry metadata, pypistats.org downloads. Most recent observation 5h 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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