Sign in

Browse by category

More

Comparison · AI agent frameworks and tooling

LlamaIndex vs OpenAI Agents SDK: which is better in 2026?

LlamaIndex88.0#3 in best AI agent frameworks and toolingOpenAI Agents SDK84.0#8 in best AI agent frameworks and tooling

LlamaIndex ranks higher in our list of AI agent frameworks and tooling (#3 against #8, score 88.0 against 84.0).

How we rank Share

  • 88.0
    Editorial score
    84.0
  • 1
    Platforms
    3
  • Yes
    Free to use
    Yes
  • Yes
    Open source
    Yes

Which should you choose?

Choose LlamaIndex if you want

Agents that work over documents and data.

The strongest focus on documents and retrieval, with an MIT-licensed framework and a separate parsing service. It is narrower for general agent work than LangChain.

Choose OpenAI Agents SDK if you want

Lightweight multi-agent workflows in Python.

A lightweight MIT-licensed multi-agent SDK published by OpenAI, with documentation on its own site. Its scope is narrower than full platforms such as LangChain.

The main differences

  • Only OpenAI Agents SDK runs on Linux.
  • Only OpenAI Agents SDK runs on Windows.
  • Only OpenAI Agents SDK runs on macOS.

Side by side

LlamaIndexOpenAI Agents SDK
Score88.084.0
Rank in list#3 of 12#8 of 12
PriceFree and open sourceMIT-licensed framework is free; LlamaParse is a separate serviceFree and open sourceFree MIT-licensed Python SDK; no hosted fee is listed in the repository
Free to useYesYes
Open sourceYesYes
PlatformsSelf-hostedSelf-hostedWindowsmacOSLinuxWindows, macOS, Linux
Made byLlamaIndexOpenAI
LanguageNot listedPython
Agent approachDocument-centric agentsLightweight multi-agent workflows
Paid hosted serviceLlamaParse, separateNot listed
Best forAgents that work over documents and dataLightweight multi-agent workflows in Python
Strengths
  • MIT licensed with source on GitHub
  • Focus on document and data workflows
  • Separate parsing service available
  • MIT licensed and published by OpenAI
  • Lightweight multi-agent framework
  • Documentation site for installation and usage
Limits
  • Parsing service is a separate product to evaluate
  • Narrower agent focus than general orchestration frameworks
  • Narrower scope than full agent platforms
  • Hosted agent tooling is not part of the repository
LinksVisit site Visit site

Questions about LlamaIndex vs OpenAI Agents SDK

Is LlamaIndex better than OpenAI Agents SDK?
LlamaIndex ranks higher in our list of AI agent frameworks and tooling (#3 against #8, score 88.0 against 84.0). LlamaIndex is best for: agents that work over documents and data. OpenAI Agents SDK is best for: lightweight multi-agent workflows in Python.
Which is cheaper, LlamaIndex or OpenAI Agents SDK?
LlamaIndex: MIT-licensed framework is free; LlamaParse is a separate service. OpenAI Agents SDK: Free MIT-licensed Python SDK; no hosted fee is listed in the repository.
Do LlamaIndex and OpenAI Agents SDK run on the same platforms?
LlamaIndex supports Self-hosted. OpenAI Agents SDK supports Windows, macOS, Linux.

Choosing between the two

Learning Center
1:17Beginner · 4 min readHow to decide between two good optionsSettle a close call by sorting it by how hard it is to undo, setting a deadline, scoring the criteria as a tie-breaker and writing down why you chose.1:20Beginner · 6 min readHow to compare products fairly: what to keep in mindDefine the job, cap the must-haves, compare like with like, count total cost over one period and weigh the criteria. Includes a worked example.