Ultra-small English encoders (17M, 68M and 395M) fine-tuned from Ettin rerankers. Each answers choice, noul and score questions with a probability per candidate and no generated text. Experimental v0 by one developer; the weights have no licence assigned yet.
A 4B biomedical decision model by Dimitris Papadopoulos: Qwen3.5-4B tuned with Together AI's Tev1 recipe on 1.75M pharma, clinical-trial and literature decisions. One forward pass gives a temperature-scaled probability per option. Research use only.
Decides
choice, noul, score
choice, score, noul, classify
Architecture
bekko
biodecision
Fine-tuned from
cross-encoder/ettin-reranker-400m-v1
qwen/qwen3.5-4b
License
Unassigned: the weights licence is not finalised (treated as non-commercial); training code MIT
Research use only (several training sources are non-commercial); not validated for patient care
Availability
Open weights
Open weights
Hosted by
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Input price
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Decision accuracy
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75.3%
Calibration error
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Valid action rate
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Median latency
5 ms
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 bekko-system-one and biodecision?
bekko-system-one is from Yuichi Tateno (hotchpotch) and biodecision from Dimitris Papadopoulos. Both have open weights you can download and run. Both answer choice, noul and score questions. Only biodecision answers classify. bekko-system-one is the smaller model, at 395M parameters to 4.0B.
Which is more accurate, bekko-system-one or biodecision?
Only biodecision publishes an accuracy figure (75.3% on BioDecision v2 held-out test set (63,432 overlap-screened decisions from public biomedical benchmarks; the maker's own split)); bekko-system-one does not, so there is no comparison to make without your own test.
Which is cheaper, bekko-system-one or biodecision?
bekko-system-one: Free (open weights). biodecision: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Which is faster, bekko-system-one or biodecision?
By their publishers’ figures, bekko-system-one answers in about 5 ms at the median and biodecision in about 39 ms — measured on different hardware, so treat it as a rough guide.
Can I run bekko-system-one or biodecision locally?
Yes, both: systemone pull hotchpotch/bekko-system-one and systemone pull lighteternal/biodecision download the weights.
39 ms
p95 latency
5.4 ms
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Evaluation suite
The maker's short-input speed probe (4-option Choice, RTX 5090, 1 Oct 2026)
BioDecision v2 held-out test set (63,432 overlap-screened decisions from public biomedical benchmarks; the maker's own split)
