Open-weight models

Some of the most powerful AI systems in the world are available for anyone to download, run, and build on. Others remain fully proprietary. These open models, which include open-weight releases where a model's core parameters are made public, are getting closer to matching the most capable proprietary systems. Epoch tracks how far behind open models are, how fast the gap is closing, and how quickly frontier AI capabilities become widely accessible.

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Open models lag state-of-the-art closed models by 4 months
Data Insight
May 29, 2026
Score: 0.0000
Open models lag state-of-the-art closed models by 4 months

Since January 2026, the most capable open-weight models have lagged frontier closed models by an average of four months, or 8 ECI points.

By Jack Edwards and Luke Emberson

Keeping up with the GPTs
Newsletter
Apr. 7, 2026
Score: 0.0000
Keeping up with the GPTs

Can Chinese and open model companies compete with the frontier through e.g. distillation and talent?

By Anson Ho

Open-weight models lag state-of-the-art by around 3 months on average
Data Insight
Oct. 30, 2025
Score: 0.0000
Open-weight models lag state-of-the-art by around 3 months on average

By Luke Emberson

Frontier AI capabilities can be run at home within a year or less
Data Insight
Aug. 15, 2025
Score: 0.0000
Frontier AI capabilities can be run at home within a year or less

Models that fit on consumer GPUs match the performance of frontier AI within a year or less.

By Venkat Somala and Luke Emberson

Training open-weight models is becoming more data intensive
Data Insight
Aug. 1, 2025
Score: 0.0000
Training open-weight models is becoming more data intensive

The ratio of training data to active parameters in open-weight LLMs has grown 3.1x per year since 2022. Recent models LLMs have been trained with 20 times more data per parameter than the optimal ratio suggested by the 2022 Chinchilla scaling laws.

By Venkat Somala and Yafah Edelman

Models with downloadable weights currently lag behind the top-performing models
Data Insight
Updated Feb. 7, 2025
Score: 0.0000
Models with downloadable weights currently lag behind the top-performing models

By Jean-Stanislas Denain

What went into training DeepSeek-R1?
Newsletter
Jan. 31, 2025
Score: 0.0000
What went into training DeepSeek-R1?

This Gradient Updates issue explores DeepSeek-R1's architecture, training cost, and pricing, showing how it rivals OpenAI's o1 at 30x lower cost.

By Ege Erdil

Frontier open models may surpass 1e26 FLOP of training compute before 2026
Data Insight
Jan. 15, 2025
Score: 0.0000
Frontier open models may surpass 1e26 FLOP of training compute before 2026

By Luke Emberson

Open vs. closed AI: How behind are open models?
Report
Nov. 4, 2024
Score: 0.0000
Open vs. closed AI: How behind are open models?

Analysis of open vs. closed AI models reveals the best open model today matches closed models in performance and training compute, but with a one-year lag.

By Ben Cottier, Josh You, Natalia Martemianova, and David Owen

Almost half of large-scale models have published, downloadable weights
Data Insight
Jun. 19, 2024
Score: 0.0000
Almost half of large-scale models have published, downloadable weights

By Ben Cottier, Josh You, and Natalia Martemianova