LlamaIndex vs Microsoft Agent Framework
Both are alternatives to LangChain. Here's how they stack up — verified facts, no spin.
Also searched as Microsoft Agent Framework vs LlamaIndex — same comparison, one verdict.
LlamaIndex keeps your data local by default and Microsoft Agent Framework keeps it in the vendor's cloud — for most teams that single fact decides it.
LlamaIndex
The focused RAG framework — data in, grounded answers out.
LlamaIndex (MIT, ~49k stars) is the framework to pick when your problem is specifically retrieval — getting your documents ingested, indexed, and answered over. Its primitives are built around the data side (loaders, indexes, retrievers, query engines) rather than trying to abstract everything, which keeps it noticeably leaner to reason about than LangChain for RAG builds. The company monetizes hosted parsing/extraction (LlamaCloud); the framework itself stays open and self-sufficient.
Microsoft Agent Framework
Semantic Kernel + AutoGen, unified — the enterprise agent stack.
Microsoft's Agent Framework 1.0 (April 2026) merged Semantic Kernel's enterprise foundations with AutoGen's multi-agent orchestration into one MIT-licensed SDK for .NET and Python — session state, type safety, middleware, telemetry, and graph-based workflows out of the box. It's the natural LangChain alternative for enterprise teams (especially .NET shops and Azure environments) that want long-term-supported APIs and a vendor standing behind the framework.
Side by side
10 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| LlamaIndex | Microsoft Agent Framework | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 90 | 80 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first data | Yes | No |
| License | MIT | MIT |
| Pricing | Free (MIT); optional hosted LlamaCloud for managed parsing/extraction | Free (MIT); integrates naturally (but not exclusively) with Azure services |
| RAM to run it wellThe figure that actually matters, not the vendor's minimum. | 4 GB for the app; your vector store is the real cost | — |
| Realistic running costWhat the box costs each month if you run it yourself. | $0 for the framework. The bill is embeddings and the vector store underneath. | — |
| Setup timeHonest first-install estimate, not the marketing quickstart. | An hour to a working pipeline, weeks to a good one | — |
| Ongoing maintenanceThe part nobody budgets for. | Version churn is real — the API has moved fast. Pin versions on anything long-lived. | — |
LlamaIndex edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Weighing both against staying on LangChain? Is LangChain free? What it actually costs →
LlamaIndex
Strengths
- +Purpose-built for RAG — the data primitives are the product
- +Leaner mental model than LangChain for retrieval apps
- +Huge loader/integration ecosystem for document types
Trade-offs
- −Less suited to general agent orchestration than dedicated tools
- −Fast-moving API surface — pin versions
Microsoft Agent Framework
Strengths
- +Enterprise plumbing included: sessions, telemetry, middleware
- +First-class .NET as well as Python
- +Stable 1.0 APIs with Microsoft LTS backing
Trade-offs
- −Microsoft-governed direction; strong Azure gravity
- −Heavier than needed for small apps
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose LlamaIndex
if your data should stay on machines you control, and purpose-built for RAG — the data primitives are the product.
Choose Microsoft Agent Framework
if enterprise plumbing included: sessions, telemetry, middleware.
Neither, yet
if both carry a real cost you should weigh first — less suited to general agent orchestration than dedicated tools, and microsoft-governed direction; strong Azure gravity. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
What it takes to run these yourself
Real requirements and honest running costs, not the vendor quickstart.
LlamaIndex vs Microsoft Agent Framework — common questions
Is LlamaIndex a better fit than Microsoft Agent Framework for llm & agent frameworks?
It depends on what you are optimising for, and the honest split is this: LlamaIndex scores 90 to Microsoft Agent Framework's 80 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. Microsoft Agent Framework earns its place on a different axis — enterprise plumbing included: sessions, telemetry, middleware. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
LlamaIndex keeps its data local or in open formats, so leaving is an export rather than a negotiation. Microsoft Agent Framework is still self-hostable, so the files stay on your server either way — but it is not local-first by design, so check what its export produces before you rely on it.
Can I self-host LlamaIndex or Microsoft Agent Framework?
Both can be self-hosted. The difference is what it costs you in time rather than whether it is possible — see the setup and maintenance rows above.
Are LlamaIndex and Microsoft Agent Framework both alternatives to LangChain?
Yes — both appear in our LangChain comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off LangChain and now choosing between the two replacements, which is a narrower and much easier question.
More LangChain head-to-heads
Related alternative guides
Facts verified 2026-07-16. Licenses and pricing change — spotted something out of date? That's a correction we want.