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.
An independent Jev-shaped reproduction on DeBERTa-v3-large. One state and any number of choice, score and yes/no questions go in, and a calibrated distribution per question comes out of one forward pass. Public gold labels only.
Decides
choice, score, noul, classify, route
choice, score, noul, classify
Architecture
decider
open-jev
Fine-tuned from
qwen/qwen3.5-2b-base
microsoft/deberta-v3-large
License
apache-2.0
apache-2.0
Availability
Open weights
Open weights
Hosted by
—
—
Input price
—
—
Decision accuracy
80.2%
85.4%
Calibration error
0.038
0.022
Valid action rate
—
—
Median latency
3.2 ms
28 ms
p95 latency
—
—
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 open-jev-deberta-v3-large?
decider is from Mapika and open-jev-deberta-v3-large from Kotoba Labs. Both have open weights you can download and run. Both answer choice, score, noul and classify questions. Only decider answers route. open-jev-deberta-v3-large is the smaller model, at 434M parameters to 2.0B.
Which is more accurate, decider or open-jev-deberta-v3-large?
They report on different suites — decider 80.2% on Decider 67-task regression set, open-jev-deberta-v3-large 85.4% on Kotoba held-out test, seen question types (banking77, SST-5, BoolQ) — so the numbers do not rank them. Test both on your own labelled examples.
Which is cheaper, decider or open-jev-deberta-v3-large?
decider: Free (open weights). open-jev-deberta-v3-large: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Which is faster, decider or open-jev-deberta-v3-large?
By their publishers’ figures, decider answers in about 3.2 ms at the median and open-jev-deberta-v3-large in about 28 ms — measured on different hardware, so treat it as a rough guide.
Can I run decider or open-jev-deberta-v3-large locally?
Yes, both: systemone pull mapika/decider and systemone pull kotoba-labs/open-jev-deberta-v3-large download the weights.
Kotoba held-out test, seen question types (banking77, SST-5, BoolQ)
