Dependency Overlap & Conflict Analysis
Where LangChain and LlamaIndex share packages — and where those shared packages cause version fights
Overlap Summary
How much of the dependency tree is shared when you use both frameworks in the same project?
14
LangChain + LlamaIndex share
0
SynapseKit + either share
14/32
LC deps at conflict risk
Version Pin Conflicts — Packages Both Frameworks Constrain
When both frameworks version-pin the same package and their ranges don't fully overlap, you have a latent conflict waiting to surface in your CI or a teammate's environment.
| Package |
LangChain requires |
LlamaIndex requires |
Conflict risk |
| pydantic |
>=2.7.4,<3.0.0 |
>=1.10.0 |
HIGH — v1 vs v2 breaking change |
| httpx |
>=0.23.0,<1.0.0 |
>=0.20.0 |
MEDIUM — upper bound from LC |
| anyio |
>=3.5.0,<5.0.0 |
>=3.0.0 |
LOW — ranges overlap well |
| typing-extensions |
>=4.7.0 |
>=4.5.0 |
LOW — both allow latest |
| pyyaml |
>=5.3 |
>=5.3 |
LOW — identical lower bound |
| sqlalchemy |
>=1.4,<3.0 |
>=1.4.49 |
MEDIUM — upper bound from LC |
Highest risk: pydantic
LangChain requires pydantic v2. LlamaIndex's range allows v1. In any project that has pydantic v1 pinned (common in scikit-learn, older FastAPI, or Airflow stacks), LangChain will fail to install or produce silent validation errors. This is the most frequent real-world conflict reported across both frameworks' GitHub issues.
HTTP Client Layers Present in Each Framework
The HTTP stack is the most redundant part of both dependency trees. Five separate packages for making HTTP requests — all pulled in transitively.
| Package |
SynapseKit |
LangChain |
LlamaIndex |
Purpose |
| httpx | — | ✓ | ✓ | Sync + async HTTP (modern) |
| httpcore | — | ✓ | ✓ | Low-level HTTP — httpx depends on it |
| aiohttp | — | ✓ | — | Async HTTP (older) — legacy integrations |
| urllib3 | — | ✓ | — | Low-level HTTP — requests dependency |
| requests | — | — | — | Classic sync HTTP (neither uses it at core) |
SynapseKit: zero HTTP at core
HTTP only enters SynapseKit when you explicitly install a provider extra. pip install synapsekit → 0 HTTP packages. pip install synapsekit[openai] → httpx arrives. You opt in.
Overall Conflict Risk Score
SynapseKit
0
Shared constrained deps
LangChain
14
Deps shared w/ LlamaIndex
LlamaIndex
14 + ORM
Shared + SQLAlchemy/NLTK breadth
www.engineersofai.com — AI Letters #11 · Full notebook: kaggle.com/misternautiyal