Decider 2B
Decider 2B by Mapika is a decision model: it answers typed questions with a probability for each allowed answer instead of generating text. It scores 25.8 on the Jev Decision Index (rank 113).
Pricing
No hosted price is listed. The weights are open: the cost is your own compute.
Specifications
- Provider
- Mapika
- 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
- Qwen3.5-2B-Base, SFT + outcome-rewarded RL
- Jev-compatible request
- No
- Runs on CPU
- No
- License
- Apache 2.0
- Hugging Face
- Mapika/decider-2b
Benchmarks
- Jev Decision IndexECE 0.077
- 25.8
- DecisionBenchECE 0.111
- 0.614
Jev Decision Index: public 29.8, ECE 0.077, Brier 0.520. Lower ECE means its probabilities can be taken at face value.
Speed & latency
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FAQ
How much does Decider 2B cost?
Decider 2B has no hosted price listed; its weights are open, so the cost is the compute you run it on.
What questions can Decider 2B answer?
Decider 2B answers choice (one of n options), score (ordered rubric), yes / no questions, returning a probability for each allowed answer.
Is Decider 2B well calibrated?
On the Jev Decision Index its expected calibration error (ECE) is 0.077; below about 0.05, a stated 80% confidence is right roughly 80% of the time.
Is Decider 2B open weight, and can it run on a CPU?
Yes, Decider 2B has open weights. It needs a GPU to run at useful speed.
Data as of 2026-10-14. Source: Metatext System One registry (metatext.io/system-one). Pricing is per 1M tokens (USD); confirm with the provider before production use.