# James Barney: circuit

> James Barney's open System One models: a LoRA adapter plus a pointer readout head on Qwen base models that answers noul, choice and score questions with a probability per option in one pass. Text (1.7B, 8B), image (VL-4B) and audio (7B) variants, plus a free hosted API.

- Page: https://systemonemodels.ai/james-barney/circuit
- API: https://api.systemonemodels.ai/v1/models/james-barney/circuit
- Download: `pip install systemonemodels && systemone pull james-barney/circuit`

## Facts

| | |
|---|---|
| Maker | James Barney (https://systemonemodels.ai/james-barney) |
| Decides | choice, score, noul, classify |
| Architecture | circuit |
| Base model | qwen/qwen3-1.7b-base |
| Parameters | 1.7B |
| Licence | apache-2.0 |
| Availability | Open weights + hosted API |
| Released | 2026-09-19 |
| Latest version | 2.2.0 |

## Hosted API

- Provider: Decision Circuits (https://decisioncircuits.com/#api)

- Input: Free · Output: Free

## Model card

<!-- generated by scripts/seed_catalog.py; edit content/models/catalog.yaml -->

# circuit-1.7b

James Barney's open System One models: a LoRA adapter plus a pointer readout head on Qwen base models that answers noul, choice and score questions with a probability per option in one pass. Text (1.7B, 8B), image (VL-4B) and audio (7B) variants, plus a free hosted API.

Adapter and head, not a standalone model; it needs the circuit repo's scorer, which applies a parallel-options mask (about 5 points lower without it). v2.0 and later add multi (every option that applies) and locate questions on text states. Siblings circuit-8b, circuit-vl-4b and circuit-audio-7b. The maker's caveats: the cold-eval train splits are in the training mix (82% MultiNLI, 97% SMS spam, 91% on 151-way CLINC for this size); confidence on undecidable inputs is not reliable; English only; intended for research and as a decision-circuits backend, not for decisions that affect people. The hosted endpoint is free and rate-limited, with no uptime commitment, and may lag the latest revision. head.pt is a PyTorch pickle.

## 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 probability
- **classify** — assigns a category from a fixed taxonomy

## At a glance

| | |
|---|---|
| Parameters | 1.7B |
| Base model | `Qwen/Qwen3-1.7B-Base` |
| Maker | James Barney |
| Released | 2026-09-19 |
| License | apache-2.0 |

## Hosted API

Served by **Decision Circuits** — $0/MTok input, $0/MTok output. [Get access](https://decisioncircuits.com/#api).

## Get the weights

```bash
pip install systemonemodels
systemone pull james-barney/circuit
```

The files are served from the maker's Hugging Face repository, [`jbarney/circuit-1.7b`](https://huggingface.co/jbarney/circuit-1.7b), and verified against the checksums recorded here.

## Read more

- [Model card](https://huggingface.co/jbarney/circuit-1.7b)
- [circuit-8b](https://huggingface.co/jbarney/circuit-8b)
- [circuit-vl-4b](https://huggingface.co/jbarney/circuit-vl-4b)
- [Training and eval code](https://github.com/Barneyjm/circuit)

---

*This page was opened by System One for James Barney, who can claim the organisation and take it over at any time.*

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From System One Models — https://systemonemodels.ai/ · every System One model: https://systemonemodels.ai/system-one-models