An open Jev-style decision model by Andy Zhang: a LoRA adapter on Gemma 4 26B-A4B (also on Gemma 4 12B) that reads a state and returns a temperature-calibrated probability for every option of a yes/no, choice or score question in one forward pass.
A 0.4B decision model made from the first 20 layers of Qwen3-0.6B plus a small attention head that compares options. It answers choice, noul and score questions in one pass, and choice order cannot change its answer by construction. Non-commercial licence.
Decides
choice, score, noul
choice, score, noul
Architecture
ajev
bev-decider
Fine-tuned from
google/gemma-4-26b-a4b-it
qwen/qwen3-0.6b
License
apache-2.0
cc-by-nc-4.0
Availability
Open weights
Open weights
Hosted by
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Input price
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Decision accuracy
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74.7%
Calibration error
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Valid action rate
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Median latency
49 ms
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p95 latency
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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 ajev and bev-decider?
ajev is from Andy Zhang and bev-decider from Avishek Biswas. Both have open weights you can download and run. Both answer choice, score and noul questions. bev-decider is the smaller model, at 478M parameters to 26B. ajev is licensed apache-2.0; bev-decider, cc-by-nc-4.0.
Which is more accurate, ajev or bev-decider?
Only bev-decider publishes an accuracy figure (74.7% on avbiswas/bev-decision test split (5,000 held-out questions over 2,617 states), the maker's own); ajev does not, so there is no comparison to make without your own test.
Which is cheaper, ajev or bev-decider?
ajev: Free (open weights). bev-decider: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Can I run ajev or bev-decider locally?
Yes, both: systemone pull andy-zhang/ajev and systemone pull avishek-biswas/bev-decider download the weights.
Evaluation suite
Sequential requests, the maker's own measurement
avbiswas/bev-decision test split (5,000 held-out questions over 2,617 states), the maker's own
