A 27B Model in 3.9 Gigabytes

PrismML released Bonsai 27B on July 14: 1-bit binary and ternary builds of Qwen3.6-27B that fit in 3.9 GB and 5.9 GB respectively, run at 11 tok/s on an iPhone 17 Pro, and retain over 90% and 95% of full-precision benchmark performance. The compression factor is around 14× versus FP16, and the models are available under Apache 2.0.

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A Trillion Parameters at a Thousand Tokens Per Second

Xiaomi and TileRT published MiMo-V2.5-Pro-UltraSpeed on June 8, pushing a one-trillion-parameter model past 1000 tokens per second on a single standard 8-GPU node — no custom silicon, just three carefully chosen co-design decisions applied to a commodity cluster.

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Training the Compression In: Gemma 4 QAT for Mobile

Google released quantization-aware training checkpoints for Gemma 4 with a new mobile-specific format — channel-wise quantization aligned with NPU memory layouts, 2-bit compression for token generation layers, pre-calculated scaling constants — bringing the Gemma 4 E2B text model under 1 GB of memory.

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The KV Cache Is More Compressible Than You Think

Two papers published this week attack the KV cache memory bottleneck from opposite directions: one proposes sharing key and value projections at training time for a 50% cache reduction with 3.1% perplexity cost, the other quantizes stored cache values to 4-bit keys and 2-bit values with no calibration required and throughput above FP16. Together they suggest the cache is far more compressible than inference engineers typically assume.

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Image Generation at 1 Bit

PrismML's Bonsai Image 4B applies 1-bit and ternary quantization to a FLUX.2 Klein diffusion transformer, compressing it 8.3× to 0.93 GB — small enough to generate images on an iPhone in under 10 seconds. It's the first demonstration that extreme quantization techniques developed for language models transfer cleanly to diffusion architectures.

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One Model, One Chip, No Framework

Salvatore Sanfilippo (antirez, Redis) released ds4: a single-model Metal inference engine for DeepSeek V4 Flash that deliberately rejects the general-framework approach. Asymmetric 2-bit quantization on MoE experts only gets a 280B-parameter model into 128 GB RAM with 26–36 t/s generation, 1M-token context, and disk-persisted KV cache on Apple Silicon.

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The Price of Looping a Transformer

Two papers published on April 24 together give the most precise picture yet of looped transformer architectures — where the same block is reused across depth instead of stacking unique layers. The first derives a recurrence-equivalence exponent φ = 0.46 from 116 training runs, showing that looping carries a real compute cost. The second proposes Hyperloop Transformers, adding hyper-connections to partially recover from it, and demonstrates that a 579M Hyperloop model outperforms a standard 1B transformer on perplexity and downstream benchmarks.

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One Bit All the Way Down

PrismML launched Bonsai on March 31, claiming the first commercially viable true 1-bit LLMs: an 8B model that fits in 1.15 GB and runs at 131 tokens/sec on an M4 Pro. The key word is "true" — every layer, including embeddings and attention, is 1-bit, not just the weights in isolation.

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