Jev-Style 2B v3

chaoliangUNSWDecision modelOpen weights

Jev-Style 2B v3 by chaoliangUNSW is a decision model: it answers typed questions with a probability for each allowed answer instead of generating text. It scores 31.4 on the Jev Decision Index (rank 104).

Pricing

No hosted price is listed. The weights are open: the cost is your own compute.

Specifications

Provider: chaoliangUNSW
Parameters: 2B
Released: Sep 2026
Open weights: Yes
Question types: Choice (one of N options), Score (ordered rubric), Yes / no
Mechanism: Decoder LM with a decision readout
Backbone: Qwen/Qwen3.5-2B
Jev-compatible request: Yes
Runs on CPU: No
License: apache-2.0
Hugging Face: chaoliangUNSW/Jev-Style-2B-Decision-v3

Benchmarks

Jev Decision IndexECE 0.118: 31.4

Jev Decision Index: public 34.0, ECE 0.118, Brier 0.528. Lower ECE means its probabilities can be taken at face value.

Self-reported by the publisher

The model's own claims, often on its own sets or a self-run copy of a public suite. Not independently verified and never ranked alongside measured results.

Jev Decision Index public suite (self-run)Self-reportedDecision Index public balanced skill, edition 0.2.1 kit (release-v2.1), self-run: 34.8

Speed & latency

Median latency per call (Decision Index)

70 ms

Compare Jev-Style 2B v3 with…

Jev-Style 2B v3 vs amos-1-large—/1M in Jev-Style 2B v3 vs amos-1-medium—/1M in Jev-Style 2B v3 vs Celeris-1 Decision$0.04/1M in Jev-Style 2B v3 vs ScaleDown Classify-1$0.04/1M in Jev-Style 2B v3 vs Cloudflare clef—/1M in Jev-Style 2B v3 vs Cloudflare clef-flash—/1M in

FAQ

How much does Jev-Style 2B v3 cost?

Jev-Style 2B v3 has no hosted price listed; its weights are open, so the cost is the compute you run it on.

What questions can Jev-Style 2B v3 answer?

Jev-Style 2B v3 answers choice (one of n options), score (ordered rubric), yes / no questions, returning a probability for each allowed answer.

Is Jev-Style 2B v3 well calibrated?

On the Jev Decision Index its expected calibration error (ECE) is 0.118; below about 0.05, a stated 80% confidence is right roughly 80% of the time.

Is Jev-Style 2B v3 open weight, and can it run on a CPU?

Yes, Jev-Style 2B v3 has open weights. It needs a GPU to run at useful speed.

Data as of 2026-10-14. Source: Metatext decision-model catalogue, 2026-10-14 (Jev Decision Index, Hugging Face). Pricing is per 1M tokens (USD); confirm with the provider before production use.