English | 简体中文 Jev-Qwen3Guard-Gen-Domain-0.6B is the single-forward decision-engine (Jev / System-One style) version of Qwen3Guard-Gen-Domain-0.6B, a generative guard model for the Hong Kong elderly-care domain. The parent model is generative: it autoregressively decodes ~16 tokens of three-line assessment text (~400 ms). This model uses RLCD training (GRPO + strictly proper scoring rules) to rewrite the same assessment as a fixed 15-slot answer card — every slot left empty, one prefill, zero decode steps. Reading next-token probabilities at each slot anchor yields the full decision: The safety taxonomy (13 categories = 9 general + 4 HK elderly-care additions), the dual evaluation modes…
Open-weight model · Text classification
Zircon-0.6B-v2-mlx
by Fahrenheit Research FahrenheitResearch/Zircon-0.6B-v2-mlx
Zircon-0.6B-v2-mlx is an open-weight model for text classification from Fahrenheit Research, released under Apache License 2.0. It has 596M parameters and a 40,960-token context. At 16-bit it needs about 1.4 GB of GPU memory, which fits on 1x MI300X from $1.85 an hour, at the lowest prices in the SAVRN Index.
Zircon v2 is a 0.6B-parameter decision model from Fahrenheit Research. It runs fully on-device on Apple silicon.
Runs On
What it takes to serve Zircon-0.6B-v2-mlx (596M parameters): the memory its weights need at each precision, and the cheapest way to rent enough data-center GPUs to hold them.
| Precision | Weights | Memory needed | Cheapest setup | Per hour | Also fits |
|---|---|---|---|---|---|
| 16-bit | 1.2 GB | 1.4 GB | 1x MI300X (192 GB) Vultr |
$1.85 | 1x H100 $1.99 · 1x MI325X $2.00 |
| 8-bit | 0.6 GB | 0.7 GB | 1x MI300X (192 GB) Vultr |
$1.85 | 1x H100 $1.99 · 1x MI325X $2.00 |
| 4-bit | 0.3 GB | 0.4 GB | 1x MI300X (192 GB) Vultr |
$1.85 | 1x H100 $1.99 · 1x MI325X $2.00 |
Memory is the weights at that precision plus 20% for the runtime and a short context; a long context needs more. Prices are the lowest on-demand hourly rates in the SAVRN Index, read Oct 1, 2026.
Zircon-0.6B-v2-mlx on every accelerator the SAVRN Index prices, at every precision
Model Card
By Fahrenheit Research, published under apache-2.0, revision e9071a690bb2.
Zircon v2 is a 0.6B-parameter decision model from Fahrenheit Research. It runs fully on-device on Apple silicon. You give it an email, a message or a pending task plus a set of options, and it returns a calibrated probability for each option in under 50 ms per decision. (1) MacBook Pro (Apple M5), 8-bit weights, median. Speed varies by hardware. (2) Fahrenheit Research internal testing, September 2026, on held-out emails not seen in training. (3) Fahrenheit Research internal testing, September 2026. 400 cases (2,000 decisions) from the public LocalLLaMA typed-decisions test set. (4) Fahrenheit Research internal testing, September 2026, on game seeds not seen in training. Built on Qwen3-0.6B…
Read Fahrenheit Research's full model card
Zircon v2
Zircon v2 is a 0.6B-parameter decision model from Fahrenheit Research. It runs fully on-device on Apple silicon. You give it an email, a message or a pending task plus a set of options, and it returns a calibrated probability for each option in under 50 ms per decision.
Specifications
| Version | Zircon v2 (0.6B, MLX 8-bit) |
| Released | September 2026 |
| Parameters | 0.6 billion |
| Model size | about 634 MB |
| Runtime | Apple silicon via MLX, runs locally |
| Output | One probability per option |
| Decision types | Pick one, yes or no, score on a scale |
| Response time | 30 to 45 ms per decision (1) |
Email and message triage (2)
| Task | Accuracy |
|---|---|
| What to do: reply, escalate, archive, or mark as spam | 93% |
| Notify now or hold | 100% |
| Priority on a 4-level scale | 94% |
| Pending steps: execute, hold for a reference, defer, or escalate | 100% |
Typed-decisions benchmark (3)
| Metric | Zircon v2 |
|---|---|
| Accuracy | 77% |
| Brier score (lower is better) | 0.060 |
Games (4)
| Game | Moves matching the expert |
|---|---|
| Tetris | 80% |
| Snake | 78% |
(1) MacBook Pro (Apple M5), 8-bit weights, median. Speed varies by hardware. (2) Fahrenheit Research internal testing, September 2026, on held-out emails not seen in training. (3) Fahrenheit Research internal testing, September 2026. 400 cases (2,000 decisions) from the public LocalLLaMA typed-decisions test set. (4) Fahrenheit Research internal testing, September 2026, on game seeds not seen in training.
Built on Qwen3-0.6B (Apache 2.0). By Fahrenheit Research.
Configuration
- Architecture
- Qwen3ForCausalLM
- Context length (tokens)
- 40,960
- Layers
- 28
- Hidden size
- 1,024
- Feed-forward size
- 3,072
- Attention heads
- 16
- Key/value heads
- 8
- Head dimension
- 128
- Vocabulary size
- 151,936
- RoPE base
- 1,000,000
- Stored precision
- bfloat16
- Model type
- qwen3
Identity and Version
- Repository
- FahrenheitResearch/Zircon-0.6B-v2-mlx
- Publisher
- Fahrenheit Research
- Task
- Text classification
- Modality
- Text
- Library
- mlx
- Parameters
- 596M parameters
- Languages
- en
- Revision
- e9071a690bb2855bd51e728d5cd8b60c3cf9e965
- First published
- 2026-09-25
- Last updated
- 2026-09-26
Files and Weights
11 files, 644.9 MB in total. The weights are 1 file totalling 633.4 MB in safetensors.
Every file
| File | Type | Size | SHA-256 |
|---|---|---|---|
| model.safetensors | Weights | 633.4 MB | f22f54017e50 |
| alphabet.json | Configuration | 1.5 KB | — |
| calibration.json | Configuration | 246 B | — |
| config.json | Configuration | 1.0 KB | — |
| generation_config.json | Configuration | 239 B | — |
| model.safetensors.index.json | Configuration | 49.8 KB | — |
| README.md | Documentation | 1.9 KB | — |
| chat_template.jinja | Other | 4.2 KB | — |
| .gitattributes | Repository | 1.6 KB | — |
| tokenizer.json | Tokenizer | 11.4 MB | be75606093db |
| tokenizer_config.json | Tokenizer | 729 B | — |
License and Download
- License
- apache-2.0
- Access
- Open weights, no gate
- Download size
- 633.4 MB
Released by Fahrenheit Research through its official repository on Hugging Face. Read the license.
Built From
- Derived from Qwen/Qwen3-0.6B
- Quantized from Qwen/Qwen3-0.6B
Memory Requirements
| Precision | Weights in memory |
|---|---|
| As published | 633.4 MB |
| 16-bit | 1.2 GB |
| 8-bit | 0.6 GB |
| 4-bit | 0.3 GB |
Weights only, from the published parameter count; the key-value cache and runtime add to this.
Questions About Zircon-0.6B-v2-mlx
How much GPU memory does Zircon-0.6B-v2-mlx need?
About 1.4 GB at 16-bit and 0.4 GB at 4-bit: the weights (596M parameters) plus a working margin. A long context needs more.
What is the cheapest GPU to run Zircon-0.6B-v2-mlx on?
At 16-bit, 1x MI300X from $1.85 an hour; at 4-bit, 1x MI300X from $1.85 an hour, at the lowest on-demand prices the SAVRN Index lists.
Can I use Zircon-0.6B-v2-mlx commercially?
Yes. Zircon-0.6B-v2-mlx is released under Apache License 2.0. The Apache License 2.0 is a permissive open-source license. It permits commercial use, modification and redistribution. It requires keeping the license and copyright notices and any NOTICE file, stating significant changes, and it includes an express patent grant from contributors.
What is Zircon-0.6B-v2-mlx's context length?
40,960 tokens, from the maximum position embeddings in its published configuration.
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