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Buying question

Which agent framework is best for retrieval-heavy applications that use documents, data connectors, indexes, and citations?

Which brands each model API named when asked this question, and which pages it cited. Answer text is not published.
Snapshot Sep 14, 2026. Each category is re-run in rotation, every few weeks.

Recommendation

Kind of question

3

Model APIs

6

Brands named

12

Pages cited

Brands

Brands the answers named

Ordered by how many model APIs named the brand, then by mentions. A mention is not an endorsement or a position.
Rank#BrandModel APIsMentionsOwn-site citationsNamed by
1LlamaIndexllamaindex.ai3111OpenAI · Anthropic · Google
2Haystackdeepset.ai240OpenAI · Google
3LangGraph / Deep Agentslangchain.com121Google
4DSPydspy.ai120Google
5CrewAIcrewai.com110Google
6Google Agent Development Kitgoogle.github.io101Anthropic

Model APIs

What each model API returned

One row per model API. The hash identifies the exact answer without publishing it.
Model APIModelBrands namedCitationsDomainsAnswer hash
OpenAIopenai/gpt-4o-miniLlamaIndex · Haystack443ee715c7…85f86
Anthropicanthropic/claude-haiku-4-5LlamaIndex · Google Agent Development Kit33a818595e…86f5a
Googlegoogle/gemini-2.5-flashLangGraph / Deep Agents · LlamaIndex · CrewAI · Haystack · DSPy5504c14517…1ece1

Sources

Pages the answers cited

Hostnames come from the URLs the answers returned. Best position is the earliest place a page was cited in an answer.
DomainCited pageBest positionCited byCitations
cloud.google.comhttps://cloud.google.com/blog/products/ai-machine-learning/llamaindex-for-rag-on-google-cloud1Anthropic1
graphlit.comhttps://graphlit.com/blog/survey-of-ai-agent-memory-frameworks1Google1
pub.towardsai.nethttps://pub.towardsai.net/building-smarter-ai-agents-with-llamaindex-haystack-and-n8n-a-deep-dive-into-rag-and-automation-146de1c5ec811OpenAI1
kanerika.comhttps://kanerika.com/blogs/llamaindex-vs-langchain-vs-haystack/2OpenAI1
langchain.comhttps://langchain.com/resources/ai-agent-frameworks2Google1
pecollective.comhttps://pecollective.com/tools/llamaindex/2Anthropic1
iternal.aihttps://iternal.ai/blockify-rag-frameworks3Google1
llamaindex.aihttps://llamaindex.ai/blog/llamaindex-is-more-than-a-rag-framework3Anthropic1
zenml.iohttps://zenml.io/blog/haystack-vs-llamaindex3OpenAI1
deepchecks.comhttps://deepchecks.com/best-ai-agent-frameworks/4OpenAI1
instaclustr.comhttps://instaclustr.com/education/agentic-ai/agentic-ai-frameworks-top-10-options-in-2026/4Google1
firecrawl.devhttps://firecrawl.dev/blog/best-open-source-agent-frameworks5Google1
Snapshots
17b304d1-ac2a-4eff-847c-74cdc49085bb
Question set
ai-agent-frameworks-2026-07-27
Benchmark version
4-ai-agent-frameworks-2026-07-27-models-64232fd32583
What is kept
Measured in Agent frameworks. Full answers are not stored or published, and no customer data is included.

See how often AI names you.

Enter your website. In about two minutes, Rank.ai asks ChatGPT, Claude and Gemini 12 questions your customers ask and grades how often they name you.

  • Your grade out of 100How often AI names you, cites your site, and how high it ranks you.
  • Who gets namedEvery competitor in the answers, most named first.
  • The pages AI readsThe sources behind each answer.
  • Three fixesWhat to fix first, with a brief for the first article.