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  "slug": "open-source-vs-closed-ai-models-gap",
  "title": "Open-Source vs. Closed AI Models: How Big Is the Gap?",
  "date": "2026-10-06",
  "canonical_url": "https://modevc.com/charts/open-source-vs-closed-ai-models-gap/",
  "claim": "The best open model trails the best closed model by 42 Arena points. In a blind vote it would still win 44% of the time, up from 31% at the widest gap.",
  "takeaway": "When the free model wins 44% of the time, the model is not the moat.",
  "sources": [
    {
      "name": "Arena leaderboard dataset (lmarena-ai, CC BY 4.0)",
      "url": "https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset"
    },
    {
      "name": "Mistral Large 4 announcement",
      "url": "https://mistral.ai/news/mistral-large-4/"
    },
    {
      "name": "Lab posts + launch trackers (llmgateway, thursdai)",
      "url": "https://thursdai.news"
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