Decider family
A family of open System One models by Mark Marosi, decider-0.8b, decider-2b, decider-4b and decider-35b-a3b on Qwen3.5 bases, that softmax letter logits at an answer slot. This page carries decider-2b v11.
Unofficial listing, compiled from Mark Marosi's public releases; the source is the GitHub repository and the Hugging Face repositories linked below. The files here are decider-2b v11 (Qwen3.5-2B-Base, 1.9B parameters, 32k context), released on 24 September 2026 with decider-4b v2.1; the family's first release was on 16 September. The family: decider-0.8b (Qwen3.5-0.8B-Base), decider-2b v11, decider-4b v2.1 (Qwen3.5-4B-Base, 4.2B), decider-35b-a3b v1 (Qwen3.5-35B-A3B-Base, 34.7B total and 3B active, also in NVFP4), decider-2b-vision, and GGUF builds of the 2B and 4B, all Apache-2.0 and all serving POST /v1/systemone. On the author's regression set of 28 held-out tasks: decider-2b v11 75.2%, decider-4b v2.1 78.4%, decider-35b-a3b 81.0%. On the JevBench public hard tier: 57.7%, 64.9% and 67.6%. The author's Q8_0 GGUF build gave the same answer as the bf16 weights on 99.16% of 144,000 questions in the author's tests; the playground runs it on a CPU.
What it decides
- choice — picks one option from a set
- score — places the input on an ordered scale
- noul — answers a yes/no question with one calibrated probability
- classify — assigns a category from a fixed taxonomy
- route — sends the input to one of several destinations
At a glance
| Parameters | 1.9B |
| Base model | qwen/qwen3.5-2b-base |
| Maker | Mapika |
| Released | 2026-09-24 |
| License | apache-2.0 |
| Reported accuracy | 75.2% |
Get the weights
pip install systemonemodels
systemone pull mapika/decider
The files are served from the maker's Hugging Face repository, Mapika/decider-2b, and verified against the checksums recorded here.