Kas 4B
Kas 4B by kpiya is a decision model: it answers typed questions with a probability for each allowed answer instead of generating text. It scores 36.7 on the Jev Decision Index (rank 93).
Pricing
No hosted price is listed. The weights are open: the cost is your own compute.
Specifications
- Provider
- kpiya
- Parameters
- 4B
- 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/Qwen3-4B
- Jev-compatible request
- No
- Runs on CPU
- No
- License
- apache-2.0
- Hugging Face
- kpiya/kas-4b
Benchmarks
- Jev Decision IndexECE 0.098
- 36.7
Jev Decision Index: public 38.4, ECE 0.098, Brier 0.463. Lower ECE means its probabilities can be taken at face value.
Speed & latency
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FAQ
How much does Kas 4B cost?
Kas 4B has no hosted price listed; its weights are open, so the cost is the compute you run it on.
What questions can Kas 4B answer?
Kas 4B answers choice (one of n options), score (ordered rubric), yes / no questions, returning a probability for each allowed answer.
Is Kas 4B well calibrated?
On the Jev Decision Index its expected calibration error (ECE) is 0.098; below about 0.05, a stated 80% confidence is right roughly 80% of the time.
Is Kas 4B open weight, and can it run on a CPU?
Yes, Kas 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 (Jev Decision Index, Hugging Face). Pricing is per 1M tokens (USD); confirm with the provider before production use.