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Bonsai

PrismMLOpen WeightsPending Human Review

Bonsai is PrismML’s independently published low-bit language-model family for local and on-device deployment. The original release contains 8B, 4B, and 1.7B models using binary weights across embeddings, attention, feed-forward layers, and the language head. The representative 8.19B checkpoint uses a Qwen3-8B-derived dense Transformer, supports 65,536 tokens, and occupies approximately 1.15 GB for weights. April’s Ternary Bonsai variants offer a different accuracy and memory tradeoff and are grouped here alongside routine packings. Apache-licensed weights and specialized inference kernels are available. This family page excludes the later, separately positioned 27B vision-language tier.

2026-03-31
1.7B, 4B, and 8.19B
Low-bit dense decoder-only Transformer
Apache-2.0

Specifications

Parameters
1.7B, 4B, and 8.19B
Architecture
Low-bit dense decoder-only Transformer
License
Apache-2.0
Context Window
65,536 tokens
Type
text
Modalities
text

Benchmark Scores

Advanced Specifications

Model Family
Bonsai
API Access
Not Available
Chat Interface
Not Available
Variants
Bonsai-1.7BBonsai-4BBonsai-8BTernary-Bonsai-1.7B (April 16)Ternary-Bonsai-4B (April 16)Ternary-Bonsai-8B (April 16)GGUFMLX

Capabilities & Limitations

Capabilities
local language generationcodingreasoningon-device inference
Known Limitations
Specialized low-bit runtimes and kernels may be requiredPeak runtime memory exceeds weight sizeAccuracy and context vary across size and binary/ternary variants
Notable Use Cases
offline assistantslocal coding supportresource-constrained language applications

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