Decider 4B
Decider 4B by Mapika is a decision model: it answers typed questions with a probability for each allowed answer instead of generating text. It scores 40.3 on the Jev Decision Index (rank 80).
Pricing
No hosted price is listed. The weights are open: the cost is your own compute.
Specifications
- Provider
- Mapika
- Parameters
- 5B
- 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/Qwen3.5-4B-Base
- Jev-compatible request
- Yes
- Runs on CPU
- No
- License
- apache-2.0
- Hugging Face
- Mapika/decider-4b
Benchmarks
- Jev Decision IndexECE 0.084
- 40.3
Jev Decision Index: public 41.2, ECE 0.084, Brier 0.454. Lower ECE means its probabilities can be taken at face value.
Speed & latency
Compare Decider 4B with…
FAQ
How much does Decider 4B cost?
Decider 4B has no hosted price listed; its weights are open, so the cost is the compute you run it on.
What questions can Decider 4B answer?
Decider 4B answers choice (one of n options), score (ordered rubric), yes / no questions, returning a probability for each allowed answer.
Is Decider 4B well calibrated?
On the Jev Decision Index its expected calibration error (ECE) is 0.084; below about 0.05, a stated 80% confidence is right roughly 80% of the time.
Is Decider 4B open weight, and can it run on a CPU?
Yes, Decider 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, Benchmark Heaven JevBench, Enterprise Decision Arena, Hugging Face). Pricing is per 1M tokens (USD); confirm with the provider before production use.