Compare frameworks
LlamaIndex vs Pydantic AI vs Haystack
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 | LlamaIndex | Pydantic AI | Haystack |
|---|---|---|---|
| Stars | 52,334 (highest of the compared values)Synced from sourceCurrent5h ago | 20,220Synced from sourceCurrent5h ago | 26,618Synced from sourceCurrent5h ago |
| downloads | 149,503Synced from sourceCurrent5h ago | 3,076,771 (highest of the compared values)Synced from sourceStale1mo ago· past SLA | — |
| Last commit | 2026-09-27Synced from sourceCurrent5h ago | 2026-09-28Synced from sourceCurrent5h ago | 2026-09-25Synced from sourceCurrent5h ago |
| Language | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago | pythonSeeded, unreviewedwritten 1mo ago |
| Licence | MITSynced from sourceCurrent5h ago | MITSynced from sourceCurrent5h ago | Apache-2.0Synced from sourceCurrent5h ago |
| Archived | noSynced from sourceCurrent5h ago | noSynced from sourceCurrent5h ago | noSynced from sourceCurrent5h ago |
| Category | ragSeeded, unreviewedwritten 1mo ago | structured-outputSeeded, unreviewedwritten 1mo ago | ragSeeded, unreviewedwritten 1mo ago |
| Contributors | 2001Synced from sourceCurrent5h ago | 609Synced from sourceCurrent5h ago | 479Synced from sourceCurrent5h ago |
| Forks | 8232Synced from sourceCurrent5h ago | 2796Synced from sourceCurrent5h ago | 3198Synced from sourceCurrent5h ago |
| Maintainer | LlamaIndexSeeded, unreviewedwritten 1mo ago | PydanticSeeded, unreviewedwritten 1mo ago | deepsetSeeded, unreviewedwritten 1mo ago |
| npm downloads, monthly | 445795Synced from sourceCurrent5h ago | — | — |
| npm downloads, weekly | 149503Synced from sourceCurrent5h ago | — | — |
| npm package | llamaindexSynced from sourceCurrent5h ago | — | — |
| npm window ends | 2026-09-26Synced from sourceCurrent5h ago | — | — |
| Open issues | 896Synced from sourceCurrent5h ago | 1013Synced from sourceCurrent5h ago | 183Synced from sourceCurrent5h ago |
| PyPI downloads, monthly | — | 13478631Synced from sourceStale1mo ago· past SLA | — |
| PyPI downloads, weekly | — | 3076771Synced from sourceStale1mo ago· past SLA | — |
| PyPI package | llama-indexSynced from sourceCurrent5h ago | pydantic-aiSynced from sourceCurrent5h ago | haystack-aiSynced from sourceCurrent5h ago |
| PyPI released | 2026-09-21T16:22:20.056831ZSynced from sourceCurrent5h ago | 2026-09-25T23:32:17.554286ZSynced from sourceCurrent5h ago | 2026-09-24T10:49:23.742948ZSynced from sourceCurrent5h ago |
| Requires Python | <4.0,>=3.10Synced from sourceCurrent5h ago | >=3.10Synced from sourceCurrent5h ago | >=3.10Synced from sourceCurrent5h ago |
| PyPI version | 0.14.25Synced from sourceCurrent5h ago | 2.51.0Synced from sourceCurrent5h ago | 3.2.0Synced from sourceCurrent5h ago |
| Repository | https://github.com/run-llama/llama_indexSynced from sourceCurrent5h ago | https://github.com/pydantic/pydantic-aiSynced from sourceCurrent5h ago | https://github.com/deepset-ai/haystackSynced 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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