A family of open System One models by Mark Marosi that softmax option-letter logits at an answer slot: decider-0.8b, 2b, 4b and 35b-a3b on Qwen3.5 bases, decider-12b on Gemma-4-12B-it, and training-free readouts of larger chat models. This page carries decider-2b v11.
A 396M ModernBERT-large cross-encoder that answers typed questions about a text or a JSON state: one or several options, scores, yes/no with "not stated", spans with evidence quotes, rankings and numeric bins, each with a confidence and an act-or-escalate signal.
Decides
choice, score, noul, classify, route
choice, score, noul, rank, extract
Architecture
decider
solvi
Fine-tuned from
qwen/qwen3.5-2b-base
answerdotai/modernbert-large
License
apache-2.0
apache-2.0
Availability
Open weights
Open weights
Hosted by
—
—
Input price
—
—
Decision accuracy
75.2%
59.4%
Calibration error
—
0.210
Valid action rate
—
—
Median latency
—
—
p95 latency
—
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 solvi?
decider is from Mapika and solvi from solvi. Both have open weights you can download and run. Both answer choice, score and noul questions. Only decider answers classify and route. Only solvi answers rank and extract. decider reads up to 32K tokens of state, against 512 tokens for solvi. solvi is the smaller model, at 396M parameters to 1.9B.
Which is more accurate, decider or solvi?
They report on different suites — decider 75.2% on Decider regression set, 28 held-out tasks (decider-2b v11), solvi 59.4% on Fast Decisions public dev split (100 rows x 17 domains, macro), the maker's own harness, zero-shot — so the numbers do not rank them. Test both on your own labelled examples.
Which is cheaper, decider or solvi?
decider: Free (open weights). solvi: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Can I run decider or solvi locally?
Yes, both: systemone pull mapika/decider and systemone pull solvi-ai/solvi download the weights.
