The most-downloaded open System One reproduction. Merged Qwen3.5 fine-tunes, trained on about 95 public decision sets, then calibration-aware RL and a rank-64 LoRA, that softmax letter logits at an answer slot.
A 144M-parameter System One model on the multilingual mmBERT-small encoder. Takes a state, a question and 2 to 20 options and returns one decision with probabilities for choice, score and yes/no questions, on a CPU.
Decides
choice, score, noul, classify, route
choice, score, noul, classify, route
Architecture
decider
julia
Fine-tuned from
qwen/qwen3.5-2b-base
jhu-clsp/mmbert-small
License
apache-2.0
apache-2.0
Availability
Open weights
Open weights
Hosted by
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Input price
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Decision accuracy
80.2%
73.2%
Calibration error
0.038
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Valid action rate
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Median latency
3.2 ms
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p95 latency
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Evaluation suite
Decider 67-task regression set
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 decider and julia-1?
decider is from Mapika and julia-1 from Supersonic Labs. Both have open weights you can download and run. Both answer choice, score, noul, classify and route questions. julia-1 is the smaller model, at 144M parameters to 2.0B.
Which is more accurate, decider or julia-1?
They report on different suites — decider 80.2% on Decider 67-task regression set, julia-1 73.2% on typed-decisions test set (400 cases, 2,000 questions) — so the numbers do not rank them. Test both on your own labelled examples.
Which is cheaper, decider or julia-1?
decider: Free (open weights). julia-1: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Can I run decider or julia-1 locally?
Yes, both: systemone pull mapika/decider and systemone pull supersonic-labs/julia-1 download the weights.
typed-decisions test set (400 cases, 2,000 questions)
