decisor-4b

underlabsDecision modelOpen weights

decisor-4b by underlabs 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: underlabs
Parameters: 5B
Released: Oct 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/Qwen3.5-4B
Jev-compatible request: Yes
Runs on CPU: No
License: apache-2.0
Hugging Face: underlabs/decisor-4b

Benchmarks

Benchmark Heaven JevBench (Capability): 45.8

Compare decisor-4b with…

decisor-4b vs amos-1-large—/1M in decisor-4b vs amos-1-medium—/1M in decisor-4b vs Celeris-1 Decision$0.04/1M in decisor-4b vs ScaleDown Classify-1$0.04/1M in decisor-4b vs Cloudflare clef—/1M in decisor-4b vs Cloudflare clef-flash—/1M in

FAQ

How much does decisor-4b cost?

decisor-4b has no hosted price listed; its weights are open, so the cost is the compute you run it on.

What questions can decisor-4b answer?

decisor-4b answers choice (one of n options), score (ordered rubric), yes / no questions, returning a probability for each allowed answer.

Is decisor-4b well calibrated?

No calibration measurement for decisor-4b is recorded yet.

Is decisor-4b open weight, and can it run on a CPU?

Yes, decisor-4b 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 (Benchmark Heaven JevBench, Hugging Face). Pricing is per 1M tokens (USD); confirm with the provider before production use.