1h ago

Epoch AI finds open-weight AI models lag behind proprietary systems by an average of four months

The lag represents an eight-point deficit on Epoch's index.

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Original post
Florian Brand#1153@XEOPHONOPEpoch AIEpoch AI@EPOCHAIRESEARCH

We took another look at the capability gap between open-weight and proprietary models. Since the start of the year, open-weight models have lagged the state of the art by four months.

1:01 PM · May 29, 2026 View on X
QUOTE POSTChubby♨️#1496Chubby♨️@KIMMONISMUS

According to research by EpochAI, open-weight models lag behind frontier closed-source models by four months.

Four months. That's very little. And impressive at the same time.

Epoch AIEpoch AI@EpochAIResearch

We took another look at the capability gap between open-weight and proprietary models. Since the start of the year, open-weight models have lagged the state of the art by four months.

8:01 PM · May 29, 2026 · 11.2K Views
8:19 PM · May 29, 2026 · 5.6K Views
Epoch AI finds open-weight AI models lag behind proprietary systems by an average of four months · Digg