# Why Gated DeltaNet Survives 4-Bit Quantization: NVFP4 W4A4 for the Recurrent Half of a Hybrid 27B LLM

Page: https://stenobird.com/podcast/daily-paper-cast-7079649/why-gated-deltanet-survives-4-bit-quantization-nvfp4-w4a4-for-the-recurrent-half-of-a-hybrid-27b-llm
Text version: https://stenobird.com/podcast/daily-paper-cast-7079649/why-gated-deltanet-survives-4-bit-quantization-nvfp4-w4a4-for-the-recurrent-half-of-a-hybrid-27b-llm.md
Podcast: [Daily Paper Cast](https://stenobird.com/podcast/daily-paper-cast-7079649)
Published: 2026-09-04T08:13:09+00:00
Episode link: https://share.transistor.fm/s/43af8c54
Audio file: https://media.transistor.fm/43af8c54/71322b2a.mp3
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JSON: https://stenobird.com/v1/public/podcasts/daily-paper-cast-7079649/episodes/why-gated-deltanet-survives-4-bit-quantization-nvfp4-w4a4-for-the-recurrent-half-of-a-hybrid-27b-llm
Duration seconds: 1203

## Resource

🤗 Upvotes: 51 | cs.AI Authors: Sergii Kozyrev, Davyd Maiboroda Title: Why Gated DeltaNet Survives 4-Bit Quantization: NVFP4 W4A4 for the Recurrent Half of a Hybrid 27B LLM Arxiv: http://arxiv.org/abs/2609.04098v1 Abstract: Hybrid LLMs pair softmax attention with linear-attention layers such as Gated DeltaNet (GDN), whose recurrent state summarizes the context in fixed size. Early community 4-bit quantizations of Qwen3.8-27B (48 GDN layers, 16 attention layers) left the GDN block in 8- or 16-bit precision -- especially its decay and write-strength gates -- on the intuition that errors in a recurrence accumulate over long contexts. We test that intuition by building Minima: NVFP4 W4A4 on all 496 linear layers, GDN included. Across perplexity at 4K/32K, MMLU-Pro, GSM8K, AIME'25, GPQA-Diamond, LiveCodeBench, and RULER retrieval to 64K, Minima matches BF16 within seed noise (5-task average -0.52) while being the smallest (17.5 GiB) and fastest-prefill (+14-19%) recipe we compare, and its 32K perplexity gap shrinks with position. A four-part mechanism study explains why: (i) NVFP4's 16-element block scaling localizes the residual stream's extreme outliers, equalizing activation error across layer roles; (ii) the supposedly fragile gate projections are the least sensitive -- softplus/exponential and sigmoid parameterizations compress ~11% GEMM error to ~2% output error; (iii) the delta-rule recurrence holds injected noise at a flat plateau over 32K tokens and forgets a state impulse within hundreds of steps, because each write overwrites the state along the current key direction; (iv) the per-token quantization cost washes out with context instead of compounding. We also repair a global-scale mismatch that arises when per-module-calibrated NVFP4 checkpoints are served by kern…

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