Kev 4B r10

Jared PalmerDecision modelOpen weights

Kev 4B r10 by Jared Palmer is a decision model: it answers typed questions with a probability for each allowed answer instead of generating text. It scores 39.5 on the Jev Decision Index (rank 84). Hosted, it costs about $0.0084 per 1,000 decisions.

Pricing

Input (per 1M tokens)

$0.04

Output (per 1M tokens)

$0.00

Per 1,000 decisions

$0.0084

Cost per 1,000 decisions assumes 200 input tokens per decision.

Specifications

Provider: Jared Palmer
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: jaredpalmer/kev-4b

Benchmarks

Jev Decision IndexECE 0.032: 39.5
Jev Decision Indexedition 0.2.1 (earlier edition): 34.6
Benchmark Heaven JevBench (Capability): 44.0
DecisionBenchECE 0.255: 0.652
JevBench coherence: 71.9
PT-BR typed decisions: 62.2

Jev Decision Index: public 38.0, ECE 0.032, Brier 0.485. Lower ECE means its probabilities can be taken at face value.

Self-reported by the publisher

The model's own claims, often on its own sets or a self-run copy of a public suite. Not independently verified and never ranked alongside measured results.

breadth-v1 test: 14 held-out public datasets (3,089 questionSelf-reported: 0.690
devtools-v1 test (1,071 questions; six public developer-toolSelf-reported: 0.756
hard-v1 test (1,088 questions; programmatic labels, held-outSelf-reported: 0.803
tasksource-heldout-v1 development: 17 of 24 held-out task faSelf-reported: 0.677
transfer-v4 test: six never-trained public sources and held-Self-reported: 0.838

Speed & latency

Median latency per call (Decision Index)

59 ms

Compare Kev 4B r10 with…

Kev 4B r10 vs amos-1-large—/1M in Kev 4B r10 vs amos-1-medium—/1M in Kev 4B r10 vs Celeris-1 Decision$0.04/1M in Kev 4B r10 vs ScaleDown Classify-1$0.04/1M in Kev 4B r10 vs Cloudflare clef—/1M in Kev 4B r10 vs Cloudflare clef-flash—/1M in

FAQ

How much does Kev 4B r10 cost?

Hosted, Kev 4B r10 costs $0.04 per 1M input tokens, about $0.0084 per 1,000 decisions at 200 input tokens each.

What questions can Kev 4B r10 answer?

Kev 4B r10 answers choice (one of n options), score (ordered rubric), yes / no questions, returning a probability for each allowed answer.

Is Kev 4B r10 well calibrated?

On the Jev Decision Index its expected calibration error (ECE) is 0.032; below about 0.05, a stated 80% confidence is right roughly 80% of the time.

Is Kev 4B r10 open weight, and can it run on a CPU?

Yes, Kev 4B r10 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 (OpenRouter, Jev Decision Index, DecisionBench, Benchmark Heaven JevBench). Pricing is per 1M tokens (USD); confirm with the provider before production use.