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AI agent frameworks: September 2026

The final September 2026 standings for “What framework should I use to build AI agents?”. These numbers are fixed and can be cited by permalink. See the current standings.

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AI share of voice · September 2026

295 sampled answers · 9 models

  1. 1AutoGen▼ 18.20%
    not named this month—
  2. 2CrewAI▼ 18.90%
    not named this month—
  3. 3LangChain▼ 29.80%
    not named this month—
  4. 4LangGraph▼ 17.40%
    not named this month· quiet
  5. 5LlamaIndex▼ 27.80%
    not named this month—
  6. 6Pydantic AI▼ 12.30%
    not named this month—

Biggest mover: LangChain ▼ 29.8 pts vs the previous month

Share of voice weights each compared model equally: it is the average, across the models, of how often each one named the tool in its own answers, so a model probed more than another can't skew it. Model chips list which AI models named it this month; the pulse is the sentiment of that month's developer mentions across Hacker News, Reddit, GitHub, Stack Overflow, Bluesky and more.

The 3 prompts behind these standings
  • ›What framework should I use to build AI agents? (recommendation)
  • ›What are the best LangChain alternatives? (alternatives)
  • ›Which framework is best for building an LLM app? (recommendation)

Each prompt is sampled several times per model per probe because answers vary run to run; 295 answers across 4 probe runs fed this month.