Epoch AI reports that open-weight AI models have consistently lagged behind proprietary models by an average of 8 ECI points since January 2026. This gap is comparable to the difference observed between OpenAI's GPT-5 and GPT-5.5. The analysis indicates that open-weight models have been approximately four months behind the state-of-the-art. AI
IMPACT This analysis highlights a persistent gap, suggesting that cutting-edge AI capabilities remain primarily with proprietary models, potentially impacting the pace of open-source innovation.
RANK_REASON The cluster reports on an analysis of AI model capabilities, which falls under research.
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