80 projects · updated 2 November 2026
Open reimplementations of decision models
People rebuilding the category from open weights: one-pass scorers, constrained decoding over local models, and small models trained to return a calibrated distribution. The fastest-moving cluster here.
50 of these 80 call the hosted API rather than running open weights.
laya34.9k ★NandhaKishorMNon-autoregressive System 1 decision engine. Typed choice, score and yes/no decisions over any text in a single forward pass, in 100+ languages, with a router that picks the right checkpoint per request.ms-swift16.0k ★modelscopeUse PEFT or Full-parameter to CPT/SFT/DPO/GRPO 600+ LLMs (Qwen3.8, DeepSeek-V4, GLM-5.1, InternLM3, Llama4, ...) and 300+ MLLMs (Qwen3-VL, Qwen3-Omni, InternVL3.5, Ovis2.5, GLM5.3, Gemma4, Llava, Phi4, ...) (AAAI 2025).kev9.8k ★jaredpalmerJev-like family of decision models built on top of Qwen3.5/3.8 you can train and run on your ownSemIf4.9k ★TheoLeeCJSemantic ifs from open models, on a 3090 at home. Independent; not affiliated with Jev or TypeSafe.SemIf-OpenJev4.9k ★TheoLeeCJSemantic ifs from open models, on a 3090 at home. Independent; not affiliated with Jev or TypeSafe.NanoJev2.6k ★TianyuCodingsA nano replica of Jev: parallel decisions, dynamic candidates, and an end-to-end training pipeline.AnyJev1.6k ★nokia-applied-researchTurn any LLM into a Jev-style decision model: typed decisions, real probabilities, no training. (continue updating, welcome any issue and PR request)ollaya1.4k ★ollaya-devJev-compatible API server for open decision models. Ollama for decision models: pull and serve 29 model families (Laya, pplx-decider, Clef, Winnow, coba...) locally or self-hosted behind /v1/systemone. The TypeSafe SDK works unchanged: set its base URL and pick an open model. CLI, desktop app, Docker, MCP server, public bench.jevlike1.4k ★vinnylarougeA Jev-like model takes a piece of text and a list of N text options. It returns one probability for each option. It does this in oreticle1.3k ★reticlehqAI agents can generate code, but still struggle to understand what they build. Reticle brings Jev-style machine-native runtime perception to web & desktop applications.decider1.2k ★MapikaA family of System One-style models fine-tuned from Qwen3.5, designed for one-pass typed decisions with calibrated probabilities.TypeLLM977 ★TypeLLMTypeLLM: LLMs with type-safe generationrizzo-flow953 ★Rizzo-AI-AcademyThe open, local take on Jev: typed decisions from an LLM, without generating a single tokenjev948 ★feder-crjevos: an open-source alternative to Jev and Microsoft-Decision-1. Yes/no decisions, choices and scores with probabilities, on your laptop's CPU.vllm-jev919 ★mode-ioNative vLLM serving for Jev decision modelsValen898 ★Liuziyu77Open, lightweight multimodal decision models for text, images, and video. Train and run them yourself.Valen898 ★Valen-TeamOpen, lightweight multimodal decision models for text, images, and video. Train and run them yourself.jev-cookbook564 ★datawhalechina⚡ 适合中国宝宝的 Jev 入门教程｜手把手带你了解关于 Jev 的一切——Jupyter Notebook 轻松实验，从三种问题原语到 18 篇实战配方、语音智能家居、模型评测与本地微调，全面掌握 System One 判断模型的开发范式Open-Jev439 ★Zefan-CaiOpen probability decisions with Qwen3.5-2B, Qwen3.5-9B and Qwen3.8-27B. Supply a context, questions and candidates; get typed probjeeves432 ★PostHogJeeves – Reasoning improves Jev-like decision modelsimajev418 ★mohit67890Open Jev-style typed-decision model that also takes images: photo + app state + typed questions in, calibrated probabilities out, locally.agent-jev397 ★malevrignsAgentJev-0.6B - a fast 'System One' decision model for AI Agents: feed it any unstructured state (diffs, traces, logs) and structured questions, get calibrated probability distributions back in one ~50ms forward pass. Zero output-token decoding.jev-visual326 ★hr98wAn educational Jev-like visual inference experiment on Apple Silicon: shared context, direct candidate scoring, and local visual demos.jiwo297 ★jiwidiSmall decision models (jev style) for latency critical scenarioshunch294 ★undrgrnd-labsa systemone proxy using embeddings that distills a teacher modeltev1259 ★togethercomputerOpen-weight, Jev-inspired decision model finetuned on top of Qwen3.5 4BStartLux-Prism236 ★StartLuxLabsFast, exact inference for StartLux-Decision models on NVIDIA GPUs: the released GGUF files on int8 and 4-bit tensor cores, behind the /v1/systemone API, with up to 5.3× lower latency than vLLM in FP8 and bit-identical answers.djev-spark220 ★mmastracDiffusionGemma NVFP4 structured decisions on a DGX Spark: container recipeOneJev217 ★OmniJev🚀🚀 A multimodal System One decision model that gives calibrated answers to typed questions about screens, photos, video and text in one forward pass.reflex173 ★kshetrajna12A small open decision model: state + typed questions -> calibrated probabilities. A Jev / System One re-creation on Qwen3.5.jev-forge164 ★zwliJayAn open training and inference stack for Jev-style decision models. Train models to score dynamic candidate branches from a shared prefix, with support for high-cardinality choice, calibration, and fast batched inference.jevk5158 ★allebeeJevK5: open-weight alternative to TypeSafe Jev. Typed decisions with probabilities in one forward pass; Apache-2.0 weights and code.open-jev136 ★kyegomezan open-source, from-first-principles reconstruction of the ideas behind TypeSafe AI's Jev, written in pytorchRSI-Jev128 ★Shanghua-GaoTyped-decision models (noul / choice / score) trained by a self-improving loop of AI agents — checkpoints, the code that produced them, and every version that failed.djev115 ★mmastracJev-style structured decisions on DiffusionGemma: the example server from vLLM PR 57250Bud-Decision-Studio108 ★BudEcosystemBud Decision studio is an easy to use cross platform desktop application & serving system for Jev like models locally.bev-train83 ★avbiswasTraining Jev-like decision models using Qwen3 with choice-order invarianceMica82 ★akivetA 4B decision model: calibrated probabilities for yes/no, choice and score questions over long inputs.gutsy81 ★kouhxpLocal decision model with calibrated probabilities: send a state and yes/no, choice or score questions, get a probability for every option. 0.8B GGUF on CPU, Jev-style API.decision-cascade78 ★slavabarsLocal decision engine with typed, calibrated outputs (Noul/Choice/Score): cheap→strong cascade, ECE/Brier calibration, SystemOne protocol interop. Apache-2.0.jevmlx77 ★bnsd55Jev-style parallel constrained decisions for any MLX model on Apple Silicon. Typed, schema-valid JSON in one forward pass.jevfire76 ★kikoncuoJEV-inspired parallel decisions for CUDA LLMs. One context, many decisions. vLLM API, game-agent examples, and reproducible benchmarks.stuntd74 ★bladedevoffLocal proxy that learns your app's typed LLM decisions and answers them with a Laya head. Jev and OpenAI compatible.Jevstiller71 ★tomerglick57Distill a repeated Jev classification task into a local model, on the fly — same answers, your hardware.OpenJev70 ★alanhuangyooOpenJev: open-source, local alternative to Jev. System-One decision models: typed questions in, calibrated probabilities out; general decisions and browser-agent steps.openthai-systemone69 ★iapp-technologyOpenThai-SystemOne: open Thai + English System One decision model (0.8B, 256-way slot head, Apache-2.0)sarvam-jev61 ★SAGAR-TAMANGGeneration-free typed decisions on Indic LLMs. An open Jev-style inference engine on sarvam-1: constrained logit readout instead of autoregressive JSON. Runs client-side in the browser.mini-jev60 ★r-msmini-Jev: what a Jev-style typed-decision interface looks like on a frozen Qwen3-4B — read the option letter's logits instead of generating JSON. Preregistered experiment, results, teaching bench.SelfJev60 ★jwuthri-cloudSelf-hosted decision model (selfjev-4b) with a Jev-compatible API: Python SDK, server, fine-tuning and RLCD.lichen59 ★Mushroom-SystemsA local, API-compatible replacement for Jev, TypeSafe's System One modellaya-opencv58 ★uu889OpenCV 与判定模型（Laya / Jev）结合的本地工作台：OpenCV 看图测量，硬规则管数字，模型下结论。用于水果采摘、杂草与害虫监测、钢管和纺织物质检。 | OpenCV + Laya/Jev decision models in a one-click local workbench: OpenCV measures, hard rules settle the numbers, the model gives the verdict. For agriculture and quality inspection.lev58 ★AbhinavexistsAn open System One decision modelsys158 ★alvarobarttBlazing fast, self-hosted structured decisions for open models with a TypeSafe AI compatible API, written in Rust.jevify56 ★fidecastroSupersimple way to serve LLMs as a Jev-like endpointsystem-one51 ★snellingioSystem One Lite is a proof-of-concept HTTP service for constrained decisions with a local language model. Send text or JSON plus oopen-jev-typed-decision-engine49 ★intikhab49Open reproduction of TypeSafe Jev: a 150M typed decision engine (noul/choice/score in one non-autoregressive pass, calibrated confidence). 0.697 vs Jev's 0.727, 2.5x better calibrated, 4x faster, free. Trains on a Colab T4 in 30 min.OpenSourceJev47 ★sabeel111Turning an LLM model into a Jev like System. open-jev45 ★nico-martinopen-jev is a browser-focused TypeScript library for typed decisions: one piece of text (the state) plus any number of typed questions go in, and one forward pass returns a calibrated probability distribution per question. Nothing is generated, so an answer is always one of the options you provided.system-one-open41 ★mithalouniOpen replica of TypeSafe's Jev: typed calibrated decisions in one forward pass, on Gemma 4 E2B / Gemma 3 270M (Modal)system-one39 ★sgoedeckeBatched single-token choice inference for open language models, compatible with TypeSafetypesafe-ai-benchmark38 ★iammrduncanThis is a LLM Gateway that mimics typesafe ai structured output. Like an imposter Jev.dohnuts38 ★PsiACEDohnuts builds small multimodal models for direct decisions. -> System One modelarbiter35 ★0xBakeerServe typed-decision (System 1) models — Laya or your own — on NVIDIA GPUs or Apple Silicon, with a Jev-compatible API and coding-agent integrationstinyjev29 ★ankit-aglaweA tiny jev-like model that answers Choice, Score and Noul questions in one forward pass and returns calibrated probabilities. MLX or PyTorch, fully offline, System One compatible.vev26 ★XiaooolongJev-like decision models that can also see images — open weights on Qwen3.5, run on your own GPUlaya-mps25 ★afshinmRun Jev-style typed decisions locally on your Mac with low RAM usage and fast responsesjev-on-a-laptop25 ★rorshoppingUnofficial study: Jev-style parallel typed decisions on stock 1.5B-8B models on an Apple Silicon laptop. Benchmarks, research notes, and a Hugging Face Space demo.open-spark-jev24 ★abhishek085Open-source, local decision models inspired by TypeSafe’s Jev and System One - built on Qwen3 for NVIDIA DGX Spark.jev-style24 ★lawrence3699Local classification, routing, and scoring for AI agents, with option probabilities. Text + images, Python, MCP and agent skills.local-jev24 ★amithgc A local, offline System One server compatible with TypeSafe's Jev API. It answers typed yes/no, category and score questions with small open models.Kev22 ★arjun988Open-source System One decision engine. Typed choice / score / noul with calibrated probabilities. Self-host with Ollama or any OpenAI-compatible model. Apache-2.0.jev-rs21 ★yijunyuSystem One judgments (noul/choice/score) from any LLM in one prefill — a Rust, Jev-compatible /v1/systemone engineollajev18 ★nvkudvaRun System One decision models from Hugging Face locally behind the Jev / System One API, Ollama styleJEV-CPU18 ★leesk212Run SemIf (Jev-style semantic-if decisions) on a CPU — no GPU. Reads typed option probabilities straight from an open model in one forward pass, plus a web UI.Nemotron_Jev16 ★pst2154Ask typed questions about text or JSON and inspect model-derived probability distributions in a browser. One container runs the mojevbetter15 ★olanotoluA stronger one-pass scorer over a variable list of text options. Hashed n-gram encoder, rival-aware attention, gated head, temperature scaling — with a head-to-head benchmark vs the jevlike starter design.Decis11 ★chaitinSelf-hosted, Jev-compatible decision-model API — one /v1/systemone endpoint, open weights (Laya, kev), one Docker image per engine.poorjev11 ★rupeshpoojary9Open-source, local Jev alternative: a System One decision layer with provably calibrated confidence (ECE 0.170→0.071). Typed decisions, runs offline, no API key, no waitlist.kev-onnx10 ★aleskxyzSelf-hosted, TypeSafe-compatible /v1/systemone API server for the KEV decision model - CPU-only ONNX inference via FastAPI, no GPU required.krasivo-jev10 ★SergeyBazhminTraining data and models for "system one" classifiers: one forward pass, no reasoning. 100 Hugging Face datasets turned into one format (state → question → options → label), a Qwen3.5-2B LoRA model with a pointer head, held-out benchmarks, and a vLLM plugin that serves TypeSafe's system_one API.
Other things people build
Developer tooling 84
Code review gates, CI checks, agent harnesses and editor plugins. The densest cluster in the ecosystem, because a coding agent makes hundreds of small decisions per session and each one costs something.
Agents 30
Tool selection, routing and step gating. An agent choosing its next action is the purest version of the problem this class of model exists for.
Language integrations 30
Libraries that make a typed decision feel native to a language: pattern matching on an answer in Elixir, a probabilistic if in Ruby, a typed method via BAML.
Browser 22
Extensions and automation that judge pages: what to hide, what to click, what is worth reading. Latency matters here in a way it does not on a server.
Find out what your data actually supports
We turn your historical decisions into a frozen test set, then tell you which model, which threshold, and how much of it you can safely automate.