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Zyphra's release of ZUNA1.1 marks a significant architectural shift in EEG foundation models by introducing variable-length input processing via 4D rotary positional encoding, allowing the system to handle real-world recording inconsistencies like channel dropouts and arbitrary session durations without sacrificing reconstruction accuracy. This flexibility enables robust denoising and upsampling across diverse electrode layouts on consumer hardware, expanding the practical utility of open-source brain-computer interface data for research applications under an Apache 2.0 license.
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Zyphra Releases ZUNA1.1: An Apache 2.0 EEG Foundation Model With Variable-Length Inputs From 0.5 To 30 Seconds

MarkTechPost6 min read

Zyphra released ZUNA1.1 on July 16, 2026, under the Apache 2.0 license. The 380M masked diffusion autoencoder reconstructs, denoises, and upsamples scalp-EEG across arbitrary channel layouts. It accepts variable-length inputs from 0.5 to 30 seconds, against ZUNA1's fixed five seconds. Reported NMSE holds or improves while the input range widens. The post Zyphra Releases ZUNA1.1: An Apache 2.0 EEG Foundation Model With Variable-Length Inputs From 0.5 To 30 Seconds appeared first on MarkTechPost.

This week, Zyphra released ZUNA1.1 under the Apache 2.0 license. The EEG foundation model reconstructs, denoises, and upsamples data across arbitrary channel layouts. It builds on ZUNA1, the Zyphra’s earlier open EEG foundation model. The main change is flexibility, not a jump in raw accuracy. Real EEG recordings are messy. Sessions vary in length, and channels go noisy or drop out mid-session. Montages range from four-electrode headbands to 256-channel research caps. ZUNA1 processed only fixed five-second segments. ZUNA1.1 accepts variable-length inputs from 0.5 to 30 seconds. What is ZUNA1.1? To understand that flexibility, start with what…

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