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Buying question

What are the best open-source frameworks for building reliable AI agents in a production application?

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

7

Brands named

7

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
1Haystackdeepset.ai240OpenAI · Google
2LangGraph / Deep Agentslangchain.com222OpenAI · Google
3CrewAIcrewai.com220OpenAI · Google
4Hugging Face smolagentshuggingface.co110Google
5Mastramastra.ai110Google
6OpenAI Agents SDKopenai.com110Google
7Pydantic AIpydantic.dev110Google

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-miniLangGraph / Deep Agents · CrewAI · Haystack44f736fd64…9c971
Anthropicanthropic/claude-haiku-4-5None named00a6011974…99bef
Googlegoogle/gemini-2.5-flashLangGraph / Deep Agents · OpenAI Agents SDK · CrewAI · Pydantic AI · Mastra · Hugging Face smolagents · Haystack6630488435…0c8b8

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
firecrawl.devhttps://firecrawl.dev/blog/best-open-source-agent-frameworks1OpenAI · Google2
langchain.comhttps://langchain.com/resources/ai-agent-frameworks1OpenAI · Google2
langfuse.comhttps://langfuse.com/blog/2025-03-19-ai-agent-comparison2Google1
reddit.comhttps://reddit.com/r/AI_Agents/comments/1tp335p/i_compared_8_opensource_ai_agent_frameworks_so/2OpenAI1
pub.towardsai.nethttps://pub.towardsai.net/the-4-best-open-source-multi-agent-ai-frameworks-2026-9da389f9407a4OpenAI · Google2
lindy.aihttps://lindy.ai/blog/ai-agent-frameworks4Google1
medium.comhttps://medium.com/data-science-collective/agentic-ai-comparing-new-open-source-frameworks-21ec676732df5Google1
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.

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  • 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.