Compare frameworks
Letta vs DSPy vs Pydantic AI
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 | DSPy | Pydantic AI |
|---|---|---|---|
| Stars | 24,864Synced from sourceCurrent2h ago | 38,243 (highest of the compared values)Synced from sourceCurrent2h ago | 20,133Synced from sourceCurrent2h ago |
| downloads | — | — | 3,076,771Synced from sourceStale1mo ago· past SLA |
| Last commit | 2026-09-10Synced from sourceCurrent2h ago | 2026-09-23Synced from sourceCurrent2h ago | 2026-09-24Synced from sourceCurrent2h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago |
| Licence | Apache-2.0Synced from sourceCurrent2h ago | MITSynced from sourceCurrent2h ago | MITSynced from sourceCurrent2h ago |
| Archived | noSynced from sourceCurrent2h ago | noSynced from sourceCurrent2h ago | noSynced from sourceCurrent2h ago |
| Category | memorySeeded, unreviewedwritten 1mo ago | optimisationSeeded, unreviewedwritten 1mo ago | structured-outputSeeded, unreviewedwritten 1mo ago |
| Contributors | 155Synced from sourceCurrent2h ago | 459Synced from sourceCurrent2h ago | 589Synced from sourceCurrent2h ago |
| Forks | 2628Synced from sourceCurrent2h ago | 3353Synced from sourceCurrent2h ago | 2768Synced from sourceCurrent2h ago |
| Maintainer | LettaSeeded, unreviewedwritten 1mo ago | Stanford NLPSeeded, unreviewedwritten 1mo ago | PydanticSeeded, unreviewedwritten 1mo ago |
| Open issues | 0Synced from sourceCurrent2h ago | 726Synced from sourceCurrent2h ago | 965Synced from sourceCurrent2h ago |
| PyPI downloads, monthly | — | — | 13478631Synced from sourceStale1mo ago· past SLA |
| PyPI downloads, weekly | — | — | 3076771Synced from sourceStale1mo ago· past SLA |
| PyPI package | lettaSynced from sourceCurrent2h ago | dspy-aiSynced from sourceCurrent2h ago | pydantic-aiSynced from sourceCurrent2h ago |
| PyPI released | 2026-09-23T23:59:05.225455ZSynced from sourceCurrent2h ago | 2026-08-21T23:06:20.945191ZSynced from sourceCurrent2h ago | 2026-09-24T03:23:01.147978ZSynced from sourceCurrent2h ago |
| Requires Python | >=3.9Synced from sourceCurrent2h ago | >=3.9Synced from sourceCurrent2h ago | >=3.10Synced from sourceCurrent2h ago |
| PyPI version | 0.33.0Synced from sourceCurrent2h ago | 3.3.1Synced from sourceCurrent2h ago | 2.49.0Synced from sourceCurrent2h ago |
| Repository | https://github.com/letta-ai/lettaSynced from sourceCurrent2h ago | https://github.com/stanfordnlp/dspySynced from sourceCurrent2h ago | https://github.com/pydantic/pydantic-aiSynced 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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