Open-Jev-2B

ZefanCaiDecision modelOpen weights

Open-Jev-2B by ZefanCai is a decision model: it answers typed questions with a probability for each allowed answer instead of generating text.

Pricing

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

Specifications

Provider: ZefanCai
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: ZefanCai/Open-Jev-2B

Benchmarks

Benchmark Heaven JevBench (Capability): 47.7
DecisionBenchECE 0.211: 0.612

Compare Open-Jev-2B with…

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

FAQ

How much does Open-Jev-2B cost?

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

What questions can Open-Jev-2B answer?

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

Is Open-Jev-2B well calibrated?

No calibration measurement for Open-Jev-2B is recorded yet.

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

Yes, Open-Jev-2B 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 (DecisionBench, Benchmark Heaven JevBench, Hugging Face). Pricing is per 1M tokens (USD); confirm with the provider before production use.