CommunityJev Guides & Articles
Jev vs Kev tested side by side
The Hacker News thread for Opper's hosted comparison of typesafe/jev-latest and opper/kev-4b on the same wire format.
- Format
- Post
- Published by
- Community
- Author
- felix089
- Last verified
- Sep 2026
Works forJev for Evaluation
Used inJev for Software & DevTools
Highlights
- 12 points on 25 September 2026.
- Story URL is the Opper blog post cataloged as opper-jev-vs-kev.
- Moderator dang warned about AI-generated comments in the author's history on other threads.
Watch out
Measurements live in the Opper article. Point totals move.
Questions about this entry
Short answers drawn from the linked project or page.
Often the opposite. Both share the list price, but the post says the hosted model counts a fixed roughly 257 extra input tokens per request, which makes short requests cost up to 12x more. Whether you win or lose depends entirely on your prompt-length mix.
The author's own framing is noise: within 2 points on every task, inside the noise at 362 items. The claim that actually separates the two is calibration, with the widest reported gap on paraphrase detection at 87.0% against 74.5%.
The stated design is defensible: 362 items published after both models shipped, drawn from new arXiv papers, Stack Exchange questions and GitHub issues, with answers taken from the source. Benchmark code and items are on GitHub if you want to rerun them.
Reasonable skepticism. Both models were routed through the author's own startup, and a moderator warned on the thread about AI-generated comments in that author's history elsewhere. Nothing here proves the numbers wrong, but read the repository before adopting them.
typesafe/jev-latest against opper/kev-4b, hosted on the same endpoint and wire format. Kev is described as Jared Palmer's Apache-2.0 fine-tune of Qwen3.5-4B.
In the Opper blog post cataloged as opper-jev-vs-kev. The thread itself carries 12 points on 25 September 2026, and the benchmark code and items are on GitHub if you want to rerun them.
Very little: 12 points and two comments, with the author's own comment marked flagged. The substance lives in the Opper article rather than in the thread.
Reactions & coverage
Posts, threads, and videos about this entry from around the web.
Hacker News: Opper hosts Kev 4B and typesafe/jev-latest on one systemone compat route.
felix08912 pointsJev vs. Kev: open-source Jev alternative tested side by sideRead the thread on Hacker NewsLinkedIn: What multimodal decision models actually change, and what they do not.
LinkedInJevDirectory.org
Hacker News: Decision Index 0.2.1 scores open reproductions of Jev on a frozen suite.
jackbravo4 pointsDecision Index 0.2.1 – 70 open reproductions of TypeSafe Jev's Decision ModelRead the thread on Hacker NewsHacker News: Pointer to a DiffusionGemma plus vLLM tutorial for a Jev-shaped classifier.
1 pointHow to build a Jev-style classifier with DiffusionGemma and vLLMRead the thread on Hacker NewsMore Jev resources like this
The r/LocalLLaMA thread arguing that Jev's constrained probabilities are ordinary zero-shot classification, and that the comparison should be other classifiers.
Jev Guides & ArticlesPost#community#open-models#evaluation
Community
Opper hosts Kev 4B and typesafe/jev-latest on the same /v1/systemone compat route and compares accuracy, tokens, and latency on 362 post-release questions.
Jev Guides & ArticlesArticle#community#article#open-models
Community
Privatemode's write-up of typed decisions from GLM-5.3-Flash in one forward pass, with latency, cost, and accuracy set next to Jev and Laya.
Jev Guides & ArticlesArticle#community#article#evaluation
Community
The Hacker News thread on Privatemode's GLM-5.3-Flash write-up, focused on whether a base model plus a classifier head can match Jev.
Jev Guides & ArticlesPost#community#open-models#evaluation
Community
632GitHub stars
A curated list of System One and typed decision models: hosted APIs, open weights, runtimes, SDKs, apps, benchmarks, and papers, in English and Chinese.
Jev Guides & Articles#community#awesome-list#open-models
958GitHub stars
An independent, community-maintained catalog of open-source projects built with Jev, citing public evidence behind each entry it lists.
Jev Guides & Articles#community#typescript#awesome-list
Community
heyjunpenn/awesome-jevAstro
heyjunpenn/awesome-jevAstroFrom the Jev guides
Original write-ups on what this entry is for.
Interface, size, license, claims — in that order. A selection guide across the system-one catalog, from a 706K form scorer to 27B Jev students.
Jev Practices & Patterns#open-models#evaluation#benchmarks
Read article
Base decision checkpoints sit near chance on purpose. The typed-decisions loop, the corpora behind the students, and the temperature fit that turns probabilities into thresholds.
Jev Practices & Patterns#fine-tuning#calibration#open-models
Read article
Hundreds of repositories carry the system-one tag, but the ecosystem is a dozen ideas in different sizes. A tour of the families, the licenses, and what a download does not include.
Jev Models & Reimplementations#open-models#hugging-face#local
Read article
From the Jev community
Posts from builders shipping with Jev right now.