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Jeffan 4B

Other · 4B

Strongest in Calibration (#65 of 234), weakest in Routing & classification (#115 of 234). Above par in 3 of 3 scopes. Among the models it meets almost everywhere, it finishes behind Baselabs mammoth-1 and KnowLine 31B-Gen1 and ahead of Seb 9B V2 and Jebadiah 9B v2.1.

§ 1 · Profile

What it is good at

Bars run from 50 — the average of the models each source lists — so right of the line is above par. The middle column is the gap to whoever leads that scope.

Decisions53.8#98/234
Calibration57#65/234
Routing & classification50.6#115/234

§ 2 · Head to head

What it beats, and what beats it

The same models turn up scope after scope. Counted once: where both were placed, who finished higher. Bars run right for Jeffan 4B, left for the other.

CLM 8Bwon 3 · lost 0
Laya multilingualwon 3 · lost 0
Julia 1won 3 · lost 0
Tacet Sonatawon 3 · lost 0
Raw Qwen3 1.7B direct logitswon 3 · lost 0
Raw Qwen3 0.6B direct logitswon 3 · lost 0
ClassOne Qwen 3.5 2Bwon 3 · lost 0
Deem 0.8B v1won 3 · lost 0
Mirrorwon 3 · lost 0
ClassOne Gemma 4 E2Bwon 3 · lost 0
openJev Verdictwon 3 · lost 0
SimpleJevwon 3 · lost 0
Phocinae Largha 150M V1won 3 · lost 0
Quyet-1.0-Tiny (Chinh Nguyen, mmBERT-small encoder (16 layers kept) with fixed heads)won 3 · lost 0
Quyet 1.0 Smallwon 3 · lost 0
Layawon 3 · lost 0
kev 0.5Bwon 3 · lost 0
Liquid AI d1-omni-600Mwon 3 · lost 0
Vega 0.8Bwon 3 · lost 0
Raw Qwen3 8B direct logitswon 3 · lost 0
Raw Phi-4 mini direct logitswon 3 · lost 0
System Onewon 3 · lost 0
ClassOne Qwen 3.5 4Bwon 3 · lost 0
Vega 4Bwon 3 · lost 0
ClassOne Gemma 4 E4Bwon 3 · lost 0
WaterSheepwon 3 · lost 0
Open Jev Deberta V3 Largewon 3 · lost 0
Raw Qwen3 4B Instruct direct logitswon 3 · lost 0
kev 0.6Bwon 3 · lost 0
OpenDecisionwon 3 · lost 0
Verdict Smallwon 3 · lost 0
Quyet 1.0 Small ENwon 3 · lost 0
Chon 1.0 12Bwon 3 · lost 0
Krino 2Bwon 3 · lost 0
openJev Verdict 1.4won 3 · lost 0
Decision Fastwon 3 · lost 0
Jeetu Decider 2Bwon 3 · lost 0
Decisor 4Bwon 3 · lost 0
Gutsy 0.8B v0.3won 3 · lost 0
Watt Flash 0.1won 3 · lost 0
kev 4Bwon 3 · lost 0
Vega Uwon 3 · lost 0
Jul fastwon 3 · lost 0
Alibaba GTE Reranker ModernBERT-basewon 3 · lost 0
Smalljev semantic-v9won 3 · lost 0
Decider 2Bwon 3 · lost 0
PurpleMIST Mini 1.0won 3 · lost 0
Qwen3 Reranker 4Bwon 3 · lost 0
Jez Small 1.0.0won 3 · lost 0
Lev 350Mwon 3 · lost 0
Certo v1won 3 · lost 0
Laya typed-decisionswon 3 · lost 0
Mixedbread mxbai-rerank-base-v2won 3 · lost 0
D1A on Gemma 4 E2Bwon 3 · lost 0
Nemotron Diffusion 8Bwon 3 · lost 0
Open-Jev 2Bwon 3 · lost 0
Jiwo 0.8bwon 3 · lost 0
DecisionNode Edge Mini 0.9.2won 3 · lost 0
OpenSourceJevwon 3 · lost 0
Malkuth 2Bwon 3 · lost 0
EXAONE-4.0-1.2B-JEV v0.3won 3 · lost 0
kev 8Bwon 3 · lost 0
Open Alternative Jevwon 3 · lost 0
Liquid AI d1-3Bwon 3 · lost 0
ZeroEntropy zerank-2won 3 · lost 0
D1A on Gemma 4 E4Bwon 3 · lost 0
DecisionNode Edge 0.9.2won 3 · lost 0
Arbiter 4Bwon 3 · lost 0
RYOTIDE Qwen9won 3 · lost 0
Jez Large 1.0.0won 3 · lost 0
Nomawon 3 · lost 0
Imajev 2Bwon 3 · lost 0
Standard One 3B SHwon 3 · lost 0
ArseneLupin v1.1won 3 · lost 0
Standard One 3B SH v4won 3 · lost 0
TypeCastLM 1.4.0won 3 · lost 0
SemIfwon 3 · lost 0
local-jev Qwen3.5-4Bwon 3 · lost 0
Decision 2Bwon 3 · lost 0
Compass 0.2.0won 3 · lost 0
Uniphore 4B Deciderwon 3 · lost 0
Typecastlmwon 3 · lost 0
CoCo Decision 4Bwon 3 · lost 0
Pjev 2Bwon 3 · lost 0
Jebadiah 9B v2won 3 · lost 0
RYOTIDE Qwenwon 3 · lost 0
Iota Decide 4Bwon 3 · lost 0
JEV Qwen3.5-9B Basewon 3 · lost 0
Decider 4Bwon 3 · lost 0
Decision 4B v1.1won 3 · lost 0
Clef Omniwon 3 · lost 0
Manchego v2.1won 3 · lost 0
Standard One 8Bwon 3 · lost 0
Decision 4Bwon 3 · lost 0
reflex 4Bwon 3 · lost 0
Verdin 4Bwon 3 · lost 0
Standard One 8B SHwon 3 · lost 0
Jiwo 4bwon 3 · lost 0
Kahn1 4Bwon 3 · lost 0
Metask Jev 4Bwon 3 · lost 0
Blink 4Bwon 3 · lost 0
Decision 2.0 Lux 9Bwon 3 · lost 0
GLiClass v4 9Bwon 3 · lost 0
JADEwon 2 · lost 1
BAAI bge-reranker-v2-m3won 2 · lost 1
ClassOne Qwen 3.5 9Bwon 2 · lost 1
Open Jev JSON Canvaswon 2 · lost 1
Spark S1 4B V6won 2 · lost 1
APUS OpenJev V1 9Bwon 2 · lost 1
Diffusion Jevwon 2 · lost 1
Bespoke Nimble 9Bwon 2 · lost 1
Jev Localwon 2 · lost 1
Messier One v0.2won 2 · lost 1
Quyet 1.0won 2 · lost 1
Wald 4Bwon 2 · lost 1
Qwen3.5-9B Jev-like data-mix v2won 2 · lost 1
Messier One v0.4won 2 · lost 1
Pplx Decider Flash V1.2won 2 · lost 1
Open-Jev 9Bwon 2 · lost 1
Decision 4B v1.2won 2 · lost 1
Levwon 2 · lost 1
Malkuth 4Bwon 2 · lost 1
Hopperwon 2 · lost 1
Decisio v0.9.0 on Qwen3.6-35B-A3Bwon 2 · lost 1
JEB 35B A3Bwon 2 · lost 1
Imajev 4Bwon 2 · lost 1
Jqvwon 2 · lost 1
Imajev 9Bwon 2 · lost 1
janus 4Bwon 2 · lost 1
JevK5 v0.2.0won 2 · lost 1
Seb 9Bwon 2 · lost 1
Clef Flashwon 2 · lost 1
JPT 4Bwon 2 · lost 1
deck-4B v1.0won 2 · lost 1
Jebadiah 9B v2.1won 2 · lost 1
Seb 9B V2won 2 · lost 1
Shisa De 1won 1 · lost 2
JevK5 v0.3won 1 · lost 2
Arcbright Elf 1 12Bwon 1 · lost 2
Metask rain 4Bwon 1 · lost 2
Bespoke Nimble 9B v3won 1 · lost 2
Plumb 4Bwon 1 · lost 2
Decider 35B A3Bwon 1 · lost 2
KnowLine 4B-Gen5.5won 1 · lost 2
Amazon Strands Decider 26B-A4Bwon 1 · lost 2
Open-Jev 27B v1.1won 1 · lost 2
Chon 1.0 E4Bwon 1 · lost 2
NInfer Qwen3.8-27Bwon 1 · lost 2
Respan Span-02won 1 · lost 2
Hopper 12B trainedwon 1 · lost 2
Torchcast Decision 4B v1.1won 1 · lost 2
Iota Decide 4B V0.3won 1 · lost 2
Xevn 4Bwon 1 · lost 2
SPX CD Omniwon 1 · lost 2
Philly Decider v2won 1 · lost 2
Chon 1.0 12B Fastwon 1 · lost 2
vLLM-SR d3-miniwon 1 · lost 2
Wald 4B v2.1won 1 · lost 2
Jebadiah 27Bwon 1 · lost 2
decider chat on Gemma-4-31B-itwon 1 · lost 2
Baselabs elephant-1won 1 · lost 2
decisio v0.9.0 on gemma-4-12B-itwon 1 · lost 2
Decider-12b v2won 1 · lost 2
decider-12b v1, stock Gemma-4-12B-itwon 1 · lost 2
Decision 2.0 Vega 27Bwon 1 · lost 2
Winnow-12B Q8won 1 · lost 2
Xor 26B-A4Bwon 1 · lost 2
Cygnetwon 1 · lost 2
Torchcast Decision 12Bwon 1 · lost 2
Jev Omniwon 1 · lost 2
AutoJev 27Bwon 1 · lost 2
Bobcat Flash 1.2won 1 · lost 2
Torchcast Decision 4B v1.2won 1 · lost 2
RSI-Jev v6.1-VL 27Bwon 1 · lost 2
Nagi-ENORMOUS 27Bwon 1 · lost 2
OpenJevwon 1 · lost 2
Aleria Judge 1.1.1won 1 · lost 2
Deck 31Bwon 1 · lost 2
Metask Jev Rain 12B Trainedwon 1 · lost 2
Torchcast Decision 4B v1.3won 1 · lost 2
Bobcat 1.3won 1 · lost 2
Metask Jev Rain 31B Trainedwon 1 · lost 2
metask-jev-rain-31B-trained service v3won 1 · lost 2
Lychee 27Bwon 1 · lost 2
Decider-4b v2won 0 · lost 2
Bev / Bonsai 27Bwon 0 · lost 3
Tern 35B A3Bwon 0 · lost 3
LitJevwon 0 · lost 3
Aplomb 1won 0 · lost 3
JevOnewon 0 · lost 3
NInfer Qwen3.8-Flash-Next mixedwon 0 · lost 3
Blink v0.3 26B-A4Bwon 0 · lost 3
GEV 26B Decidewon 0 · lost 3
decisio v0.8.0 on gemma-4-12B-itwon 0 · lost 3
JPT 35B A3Bwon 0 · lost 3
FrontiersMind Lumma-fev-27Bwon 0 · lost 3
swanOnewon 0 · lost 3
Surogate Rune 26B-A4B v3won 0 · lost 3
JEV 27Bwon 0 · lost 3
H2O-Lightning-4B v1.1won 0 · lost 3
SimpleJev Qwen3.8-27Bwon 0 · lost 3
Decisio 12B tuned commitwon 0 · lost 3
Clefwon 0 · lost 3
René-1 31Bwon 0 · lost 3
Wald 26B-A4Bwon 0 · lost 3
KnowLine 26B-A4B-Gen2.5won 0 · lost 3
Eikos 27Bwon 0 · lost 3
KnowLine 35B-A3B-Gen1.5won 0 · lost 3
StartLux-Decision v1.1 27B AutoThinkwon 0 · lost 3
decisio v0.8.0 on gemma-4-31B-itwon 0 · lost 3
Kev 27Bwon 0 · lost 3
Vera Largewon 0 · lost 3
Torchcast Decision 27Bwon 0 · lost 3
Pplx Decider V1.2won 0 · lost 3
Turion Jev 31Bwon 0 · lost 3
Nimble V4won 0 · lost 3
AJev lm6qwon 0 · lost 3
Sieve 31B V2won 0 · lost 3
Quyet 1.0 Largewon 0 · lost 3
Jeff 1.0 Largewon 0 · lost 3
Jeff 1.1won 0 · lost 3
Jeffan 31Bwon 0 · lost 3
Arcbright Elf 1 31Bwon 0 · lost 3
DOPEST 1.0 31Bwon 0 · lost 3
Basal Omni 1.0 Ultrawon 0 · lost 3
vLLM-SR d3won 0 · lost 3
Perplexity Decider v1.1 27Bwon 0 · lost 3
vLLM-SR d3-turbowon 0 · lost 3
StartLux-Decision v1.1 27B Instantwon 0 · lost 3
H2O-Lightning-31B v1.0.7won 0 · lost 3
Fastino GLiDE 1.2won 0 · lost 3
KnowLine 31B-Gen1won 0 · lost 3
Baselabs mammoth-1won 0 · lost 3

§ 3 · Sources

Where the numbers come from

1 publication, 2 figures. Every one links to the page it was read from.

JevBench ↗2 measuresread 2026-11-10
JevBench · Intelligence 40.1%JevBench · Calibration 87.9%

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