Typed decisions from Google's frozen Gemma-4-12B-it, with no fine-tuning. A small shim over unmodified vLLM letters the options, reads the model's own probability for each letter at one answer position and applies one calibration temperature; one output token per decision.
A ModernBERT-large encoder with an option-marker head. Premise and options are packed into one sequence and each option's marker is scored in a single bidirectional pass; version 1.2 makes the scoring order-invariant.
Decides
choice, score, noul
choice, score, noul, classify
Architecture
cygnet
von
Fine-tuned from
google/gemma-4-12b-it
answerdotai/modernbert-large
License
mit
apache-2.0
Availability
Open weights
Open weights
Hosted by
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—
Input price
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Decision accuracy
87.9%
63.9%
Calibration error
—
0.045
Valid action rate
—
—
Median latency
50 ms
18 ms
p95 latency
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Evaluation suite
JevBench public set (231 items), JevBench CLI
Figures are from each model’s manifest; accuracy and latency are what the publishers report, on their own suites and hardware. Add a third model.
Questions
What is the difference between cygnet and von?
cygnet is from Blockbrain Labs and von from wfzyx. Both have open weights you can download and run. Both answer choice, score and noul questions. Only von answers classify. cygnet reads up to 16K tokens of state, against 8K tokens for von. von is the smaller model, at 395M parameters to 12B. cygnet is licensed mit; von, apache-2.0.
Which is more accurate, cygnet or von?
They report on different suites — cygnet 87.9% on JevBench public set (231 items), JevBench CLI, von 63.9% on JevBench public standard tier — so the numbers do not rank them. Test both on your own labelled examples.
Which is cheaper, cygnet or von?
cygnet: Free (open weights). von: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Which is faster, cygnet or von?
By their publishers’ figures, von answers in about 18 ms at the median and cygnet in about 50 ms — measured on different hardware, so treat it as a rough guide.
Can I run cygnet or von locally?
Yes, both: systemone pull blockbrain-labs/cygnet and systemone pull wfzyx/von download the weights.
