open-system-one-bench — per-item predictions, 10,000 decisions, 5 stacks

Per-example predictions for 10,000 classification/routing decisions, from six different stacks including typesafe/jev and convaiinnovations/laya. As far as we know this is the only public per-item output from Jev on a standard benchmark, and the only place the two are measured on identical items.

With this file you can, without spending a cent on API calls:

• run significance tests (McNemar) — is 78.7 % vs 79.3 % actually a difference?
• find the specific examples where Jev wins and the open stacks lose
• verify every aggregate number in the benchmark repo

What's here

predictions.jsonl — one line per evaluation item:

{"i": 0, "dataset": "banking77", "n_options": 77, "gold": 11,
 "jev_bare": 11, "jev_bare_probs": [0.0, 0.87, ...],
 "jev_enriched": 11, "jev_enriched_probs": [...],
 "cross_bare": 11, "cross_enriched": 34, "bi_fewshot": 11,
 "laya": 11, "laya_probs": [...]}

column	stack	coverage	accuracy
jev_bare	typesafe/jev, bare label names as criteria	9,976	78.7 %
jev_enriched	typesafe/jev, one-sentence descriptions	9,976	79.5 %
cross_bare	ModernBERT-base-zeroshot cross-encoder, bare labels	10,000	78.7 %
cross_enriched	same, enriched descriptions	10,000	74.4 %
bi_fewshot	ModernBERT-embed + 8-float head, 2,000 labels/task	10,000	82.6 %
laya	convaiinnovations/laya (421M, English root, head_max_len=512)	10,000	73.2 %

options.json — the option list per dataset, in label-index order. split_indices.json — dataset + gold label for every row of the fit / dev / eval splits.

Rebuilding the text

No dataset text is redistributed — the four source datasets carry their own licences. data.py in the repo rebuilds the exact same 10,000 items from a fixed seed (SEED = 20260921), so row i here corresponds to row i there, deterministically.

Sources: stanfordnlp/sst2, fancyzhx/ag_news, dair-ai/emotion (note: its card carries a non-commercial clause), mteb/banking77 (CC-BY-4.0).

Two things to know before you quote a number

1. 24 Jev requests timed out and are null in both Jev columns. The accuracies above are computed over successful calls only. The repo's original run counted failures as wrong, which gives 78.8 % / 79.3 % instead of 78.7 % / 79.5 %. Both conventions are defensible — just don't mix them. Decide which you want and apply it to every column.
2. bi_fewshot used 2,000 labelled examples per task; Jev used none. They are not solving the same problem and the comparison is not a win. It is included because "what does this cost you once you do have labels" is the question most production teams actually face.

Jev vs Laya, on identical items

Both are "System One" decision models; only Laya is open. Same 10,000 items, same bare label names, same harness:

	sst2	ag_news	emotion	banking77	macro
typesafe/jev (bare)	89.8 %	88.3 %	58.6 %	78.4 %	78.8 %
laya (bare)	86.5 %	93.9 %	58.2 %	54.3 %	73.2 %

Laya wins AG News by 5.6 pp and loses BANKING77 by 24.1 pp. The BANKING77 gap is a token-budget artefact its own docs explain: 77 options share one head_max_len, so each label gets 3–4 tokens. Adding a zero-shot bi-encoder shortlist to top-20 lifts it to 60.8 % while halving latency — see the repo.

Latency is not comparable in kind: Jev's 381 ms is mostly network from our location, Laya's is local compute.

Correction. We first described Laya's 19–86 ms as CPU. It was not — laya.load() auto-selects cuda > mps > cpu and chose Apple MPS, while every other stack here is pure CPU, batch = 1. Re-measured like-for-like on CPU (250 items/task): 59.5 ms (SST-2), 78.0 ms (AG News), 61.9 ms (Emotion), 309.0 ms (BANKING77) — about 3× higher. On BANKING77 that leaves Laya at 309 ms against Jev's 381 ms while scoring 54.3 % against 77.8 %. The shortlist gains value on CPU rather than losing it: 309.0 ms → 169.9 ms.

Provenance

Built in zhlei07/open-system-one. The repository owner does not program; the direction and the judgement calls were his, every experiment was designed and run by Claude Code (Opus 5) in one session. Raw logs and all intermediate outputs are committed so these numbers can be checked rather than trusted. If we have misconfigured anything, please open an issue.