plumb-4b

crh225Decision modelOpen weights

plumb-4b by crh225 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: crh225
Parameters: 4B
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: alibiserikbay/JevK5
Jev-compatible request: Yes
Runs on CPU: No
License: apache-2.0
Hugging Face: crh225/plumb-4b

Benchmarks

Benchmark Heaven JevBench (Capability): 65.5

Compare plumb-4b with…

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

FAQ

How much does plumb-4b cost?

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

What questions can plumb-4b answer?

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

Is plumb-4b well calibrated?

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

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

Yes, plumb-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.