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JEV Ettin 150M

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JEV Ettin 150M is an open-weights decision model from Elfsong, released 23 October 2026. Its published size is 0.15B parameters. Licence: apache-2.0.

Catalogue identity notes

Exact Decision Index tested engine jev-ettin-150m; reported model JEV Ettin 150M. Type: full fine-tune; technique: encoder. Comparison entry; no current run command, API price or speed inferred from the benchmark. Current repository metadata checked separately; an unpinned alias is not evidence that today’s weights reproduce this historical run.

Model information sources

Release date ↗ · Weights licence ↗ · Parameter count ↗

Publisher parameter count; includes the served backbone, not just adapter size.

33.7±1.0#285 of 355 decision modelsfrom 42 benchmark results across 1 source

$ how it compares

The decision models ranked either side of JEV Ettin 150M, out of 357 with a score, then more from Elfsong.

#	model	score	where	released
285	wyat-1-800m teilomillet	34±1	model files	2026-10-18
286	tasksource Decider nano v5 (150M) tasksource	34±1	model files
287	JEV Ettin 150M Elfsong	34±1	model files	2026-10-23
288	Valen-0.8B Valen	34±1	model files
289	JPT-0.8B Qwen3.5-0.8B LoRA kirp	33±1	model files
	more from Elfsong
299	JEV FLAN-T5 Large public v2 (342M) Elfsong	32±1	model files	2026-10-18
319	JEV Ettin 400M Elfsong	29±1	model files

see all decision models · find the ones that fit your machine

$ what it's good at

tools & automation▁▃▁▁▁▃▃▄▆██▆ #211 of 250 · 10% of its score · 6 tests

Beats Cam1, InternLM Intern-Decision Qwen3.5-2B here, though they rank higher overall. Trails JevK5 Lite, Crivo-32M v2, Mola-68M here, though they rank lower overall.

test	result	vs the others in its run	difficulty	counts	why
Decision Index 0.4.1: BFCL (case exact accuracy) submitted	76.3% ✎	▁▂▁▁▁▃▂▄▅▆█▁ beats 38/246	very easy · avg 92%	▇▇ 5.4%	sharp · at its level · noisy
Decision Index 0.4.1: API-Bank (accuracy) submitted	41.7% ✎	▁▁▁▁▁▁▁▃▃▂█▂ beats 34/236	easy · avg 70%	▇ 2.2%	sharp · at its level · noisy
Decision Index 0.4.1: When2Call (accuracy) submitted	69.4% ✎	▁▁▁▂▃▅▅▆█▇█▃ beats 94/246	easy · avg 72%	▇ 1.1%	at its level · noisy
Decision Index 0.4.1: ToolRet (nDCG@10) submitted	61.0% ✎	▁▁▁▁▁·▁▁▁▄█▁ beats 73/246	medium · avg 60%	▇ 0.7%	blunt · at its level
Decision Index 0.4.1: Home appliance simulator (case exact accuracy) submitted	81.8% ✎	█▁▁▃▄▄▆▄▁▂▁▃ beats 199/243	medium · avg 37%	▇ 0.3%	sharp · noisy
Decision Index 0.4.1: RouterBench (selected quality (quality objective)) submitted	67.3% ✎	no other model yet		—	failed run: Publisher excludes this protocol because its prompt reveals GPT-4 as the best route. Evidence: https://huggingface.co/spaces/multimodalart/jev-decision-index/blob/c130faf65f82e81d3bdefb01e758c712dc5c5199/data/index.json

retrieval & classification▁▁▁·▁▁▁▁▃▃█▅ #178 of 258 · 4.7% of its score · 7 tests

Beats Solar Decide, JevK5 9B v0.3.3, Aplomb 1 here, though they rank higher overall. Trails Mola-68M, Bosun v3.1 1.7B LoRA, Dinah-1 here, though they rank lower overall.

test	result	vs the others in its run	difficulty	counts	why
Decision Index 0.4.1: Amazon ESCI (macro-F1) submitted	43.8% ✎	▁▁▁▁▁▁▂▂▃▃█▅ beats 78/246	medium · avg 47%	▇ 1.4%	at its level
Decision Index 0.4.1: BRIGHT (nDCG@10) submitted	28.4% ✎	▁▁▁▁▁▁▁▃▂▄▇█ beats 41/246	medium · avg 38%	▇ 1.4%	blunt · at its level
Decision Index 0.4.1: CLINC150+OOS (macro-F1) submitted	92.5% ✎	▁▁▁▁▁▁▁▂▃▆█▄ beats 166/238	easy · avg 83%	▇ 0.6%	sharp · at its level · noisy
Decision Index 0.4.1: HoVer (accuracy) submitted	85.2% ✎	▆▆▇▅▄▄▃▇▄█▆▄ beats 187/246	easy · avg 74%	▇ 0.5%	blunt · at its level
Decision Index 0.4.1: PhishNChips phishing decisions (accuracy) submitted	50.1% ✎	█▅▅▄▃▂▁▁▁▁·▁ beats 28/245	easy · avg 70%	▇ 0.5%	at its level · noisy
Decision Index 0.4.1: BANKING77 (macro-F1) submitted	91.8% ✎	▁·▁▁▁▁▁▁▂█▇█ beats 210/238	easy · avg 79%	▇ 0.3%	at its level · noisy
Decision Index 0.4.1: SGD/SGD-X (macro-F1) submitted	37.1% ✎	no other model yet		—	failed run: Publisher reports a builder bug exposing dialogue turns after the classified turn; awaiting corrected rerun. Evidence: https://huggingface.co/spaces/multimodalart/jev-decision-index/blob/c130faf65f82e81d3bdefb01e758c712dc5c5199/data/index.json

language understanding▂▂▂▃▂▅▆▃█▆▄▃ #206 of 256 · 24% of its score · 9 tests

Beats Valen-2B, Saina Helm 2 Omni (0.8B), vLLM-SR Decision 2.0 Sol 2B here, though they rank higher overall. Trails DecisionTune 1.0, vera-spark, JEV FLAN-T5 Large public v2 (342M) here, though they rank lower overall.

test	result	vs the others in its run	difficulty	counts	why
Decision Index 0.4.1: HellaSwag (accuracy) submitted	64.3% ✎	▂▄▂▃▄▇▃▇█▅▃▁ beats 50/246	very easy · avg 85%	▇▇▇▇ 10%	sharp · at its level
Decision Index 0.4.1: NLI4CT (macro-F1) submitted	58.3% ✎	▁▁▁▂▂▃▃▄▇▇█▄ beats 38/246	easy · avg 74%	▇▇ 5.3%	at its level
Decision Index 0.4.1: ANLI (macro-F1) submitted	47.5% ✎	▁▂▃▅▅█▂····▁ beats 56/246	medium · avg 60%	▇▇ 4.0%	at its level
Decision Index 0.4.1: iSarcasmEval (Sarcasm F1 · track A, English) submitted	18.7% ✎	▁·▁·▁▁▃▄▅█▇▄ beats 19/246	medium · avg 44%	▇ 1.3%	at its level
Decision Index 0.4.1: ContractNLI (macro-F1) submitted	81.4% ✎	▁▁▁▁▁▁▁▂▂▇▇█ beats 173/246	easy · avg 71%	▇ 1.0%	at its level · noisy
Decision Index 0.4.1: FinEntity (macro-F1) submitted	85.5% ✎	▁···▁▁▁▁▃▆█▃ beats 103/246	easy · avg 84%	▇ 0.9%	at its level · noisy
Decision Index 0.4.1: VAST (macro-F1) submitted	74.0% ✎	▁▁▁▂▅▄▄▂▄▆█▄ beats 161/246	medium · avg 62%	▇ 0.8%	at its level
Decision Index 0.4.1: RAGTruth (F1 on hallucinated class) submitted	72.5% ✎	▁▁▁▁▁▁▁▁▁▃▆█ beats 113/246	easy · avg 66%	▇ 0.7%	at its level · noisy

1 more test

test	result	vs the others in its run	difficulty	counts	why
Decision Index 0.4.1: ACOS (per-review F1) submitted	44.5% ✎	▁··▂▃▃▅▇█▇▃▃ beats 213/246	hard · avg 22%	▇ 0.4%	noisy

arts & human taste▃▇▄▃▅▅█▅▄▂▁▁ #245 of 247 · 7.3% of its score · 6 tests

Trails Zev (decision readout), LFM2.5-350M-RLCD, Nirnaya 0.4B here, though they rank lower overall.

test	result	vs the others in its run	difficulty	counts	why
Decision Index 0.4.1: New Yorker (accuracy) submitted	52.6% ✎	▁▁▂▃▃▃▇▅█▅▃▁ beats 63/246	medium · avg 61%	▇ 3.1%	at its level
Decision Index 0.4.1: BPoMP (accuracy) submitted	42.3% ✎	▃█▄▄▅█▆▅▄▁▁▁ beats 2/246	easy · avg 83%	▇ 1.7%	sharp · at its level · noisy
Decision Index 0.4.1: Humicroedit (accuracy) submitted	51.2% ✎	▁·▁▃▂▂▅█▄▂▁▁ beats 32/246	medium · avg 60%	▇ 1.4%	blunt · at its level
Decision Index 0.4.1: cfcolor (accuracy) submitted	48.8% ✎	▁········▁▇█ beats 6/246	medium · avg 60%	▇ 0.8%	blunt · at its level
Decision Index 0.4.1: Habermas Machine (accuracy) submitted	38.5% ✎	▁▂▄█▇▅▁▁▄▄▁▁ beats 45/246	medium · avg 47%	▇ 0.2%	blunt · at its level
Decision Index 0.4.1: POP909-CL (accuracy) submitted	2.8% ✎	▄▅▅▃▆▅▃▅▂▅▃█ beats 59/237	hard · avg 21%	▇ 0.1%	sharp · too hard for it · noisy

knowledge & reasoning▁▂▃▂▂▃▃▅▅▆█▂ #234 of 263 · 48% of its score · 14 tests

Beats Decision-1.0-Eos-0.8B (DecisionBench 3c2d6326), Amber 0.4B, vLLM-SR vela3-fast-vision (Vela 3.0, 0.25B) here, though they rank higher overall. Trails laya (DecisionBench 1c5edc17), LFM2.5-2.6B-RLCD, Jev-Style 0.8B v3 here, though they rank lower overall.

test	result	vs the others in its run	difficulty	counts	why
Decision Index 0.4.1: ARC-Challenge (accuracy) submitted	49.9% ✎	▂▂▃▂▂▂▁▃▄▆█▆ beats 28/246	very easy · avg 90%	▇▇▇▇ 10%	sharp · at its level
Decision Index 0.4.1: ARC-Easy (accuracy) submitted	69.7% ✎	▁▁▂▃▂▂▂▂▃▆█▅ beats 28/246	very easy · avg 96%	▇▇▇▇ 10%	sharp · noisy
Decision Index 0.4.1: MMLU (accuracy) submitted	36.8% ✎	▁▄▄▃▃▂▅▇▅█▇▁ beats 25/246	easy · avg 70%	▇▇▇ 6.8%	sharp · at its level
Decision Index 0.4.1: BBH (accuracy) submitted	38.0% ✎	▄▆▄▄█▇▇▄▃▁▁▁ beats 28/246	easy · avg 66%	▇▇ 5.4%	at its level
Decision Index 0.4.1: MMLU-Pro (accuracy) submitted	15.2% ✎	▄▄▃▃▂▄▅▇██▅▁ beats 21/246	medium · avg 46%	▇▇ 5.4%	sharp
Decision Index 0.4.1: WinoGrande (accuracy) submitted	63.7% ✎	█▅█▅▄█▆▄▃▃▁▁ beats 56/246	easy · avg 78%	▇ 3.5%	at its level
Decision Index 0.4.1: GPQA Diamond (accuracy) submitted	26.0% ✎	▂▆▅▅▆█▆▃▁··▁ beats 25/246	medium · avg 39%	▇ 1.9%	blunt · at its level
Decision Index 0.4.1: GSM8K (accuracy (4- and 10-choice)) submitted	18.3% ✎	▁··▄█▆▆▆▅▅▃▁ beats 17/246	medium · avg 45%	▇ 1.7%	sharp

6 more tests

test	result	vs the others in its run	difficulty	counts	why
Decision Index 0.4.1: MuSR (accuracy) submitted	54.0% ✎	▁▁▂█▅▄▁▁▁▁▁▁ beats 55/246	medium · avg 60%	▇ 0.9%	blunt · at its level
Decision Index 0.4.1: CLadder (accuracy) submitted	88.0% ✎	▁███▆▅▃▃▁▁▁▁ beats 212/246	easy · avg 71%	▇ 0.9%	at its level
Decision Index 0.4.1: CRUXEval (accuracy) submitted	45.3% ✎	██▄▃▃▄▁▁···▁ beats 89/246	medium · avg 58%	▇ 0.8%	at its level · noisy
Decision Index 0.4.1: SATA-Bench (case exact accuracy) submitted	5.1% ✎	▁▁▁▁▃▁▁▂▅█▂▁ beats 34/246	hard · avg 22%	▇ 0.5%	typical
Decision Index 0.4.1: ChessBench (accuracy) submitted	8.6% ✎	▄▇▄▄▄▆▄█▄▁▁▁ beats 37/246	hard · avg 16%	▇ 0.3%	blunt
Decision Index 0.4.1: HLE (accuracy) submitted	14.6% ✎	▁▁▂▃▆█▇▅▅▃▁▁ beats 185/246	very hard · avg 13%	▇ 0.0%	blunt

other tests2 not in a task · 5.8% of its score

test	result	vs the others in its run	difficulty	counts	why
Decision Index 0.4.1: private same skills (equated points)	24.6900 points ✎	▂▂▂▃▃▃▄▅▅▇█▃ beats 52/247	avg 41.206 points	▇ 3.7%	blunt
Decision Index 0.4.1: private new domains (equated points)	9.2700 points ✎	▃█▃▃▂▆▃▃▄▄▄▄ beats 17/247	avg 38.861 points	▇ 2.0%	blunt

$ where to run it

Download model files ↗
Published model files verified. This is a verified repository snapshot; the benchmark does not establish an identical weight revision. A local run command and hardware requirements have not been verified for this entry. Source · checked 2026-10-31.

Model repository and documentation: huggingface.co/Elfsong ↗

$ how the score was worked out · Decision Index 0.4.1 100%

Each result implies a score on its own, after adjusting for how hard its test is and who ran it. The score is their weighted average, with a small pull toward the middle for thinly tested models. Each test's weight is its counts column above; here it's added up by who ran the tests. How it works

source	results	share of the score	licence
Decision Index 0.4.1 · submitted; independent execution unverified	42	▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 100%	CC BY 4.0
prior · pull toward the middle		▇ 0%
weighted average		= 33.7

not counted (2)

Decision Index 0.4.1	Decision Index 0.4.1: RouterBench (selected quality (quality objective)) [correct]	67.3%	failed run: Publisher excludes this protocol because its prompt reveals GPT-4 as the best route. Evidence: https://huggingface.co/spaces/multimodalart/jev-decision-index/blob/c130faf65f82e81d3bdefb01e758c712dc5c5199/data/index.json
Decision Index 0.4.1	Decision Index 0.4.1: SGD/SGD-X (macro-F1) [correct]	37.1%	failed run: Publisher reports a builder bug exposing dialogue turns after the classified turn; awaiting corrected rerun. Evidence: https://huggingface.co/spaces/multimodalart/jev-decision-index/blob/c130faf65f82e81d3bdefb01e758c712dc5c5199/data/index.json

$ improve this page

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data updated 2026-11-03 02:37 UTC · sources and licences · json