Decision models

84 decision models, with makers, launch dates and benchmark scores.

• Celeris-1 Decision. A decision model scored on the Artificial Analysis Decision Index. Artificial Analysis reported it as the fastest per task at launch. Its maker isn't named in the sources checked.
• Certo by AltSlate Labs. Certo is an independent open reproduction of the Jev decision-model approach, by AltSlate Labs. Built on ModernBERT-large.
• Clef by Cloudflare. Cloudflare's first in-house decision model: a 27B open-weight model built on Qwen3.8-27B that returns a probability for every allowed answer instead of generating text. Hosted on Workers AI and…
• Clef-flash by Cloudflare. Cloudflare's 9B open-weight decision model built on Qwen3.5-9B, the faster and cheaper sibling of Clef. Cloudflare reports a 38.8 ms median latency on Workers AI (vendor).
• Clef-omni by Cloudflare. Cloudflare's multimodal decision model: a 30B mixture-of-experts with 3B active parameters, post-trained from Qwen3-Omni-30B-A3B-Instruct. Takes a state and typed questions and returns a probability…
• CLM by Contrastive-LM. CLM is an open "System One" style decision model, by Contrastive-LM. Benchmarked in several versions; see the scores below.
• Cloudflare Decider by Cloudflare. Cloudflare's edge-hosted decision model with a Jev-compatible API surface.
• Cygnet by blockbrain. Cygnet is an open "System One" style decision model, by blockbrain. Built on Gemma-4-12B-it (frozen).
• d1 family by Liquid AI. Liquid AI's LFM-based decision model family. Open-weight variants available, with a Jev-compatible API layer.
• d1-ultra by Liquid AI. Liquid AI's hosted multimodal decision model. Answers yes/no, choice and score questions with a probability for each option instead of generating text. Available through Liquid's API and OpenRouter.
• Decider (Mapika) by Mapika. Decider (Mapika) is an open "System One" style decision model, by Mapika. Benchmarked in several versions; see the scores below.
• Decider 1 by meraGPT. Hosted, closed-weight, text-only decision model. Exposes /v1/systemone and works with the TypeSafe SDK. Scored higher than Jev on meraGPT's own benchmark but trails on calibration.
• Decision 2B (FlyMy.AI) by FlyMy.AI. Decision 2B (FlyMy.AI) is an independent open reproduction of the Jev decision-model approach, by FlyMy.AI. Built on MiniCPM5-2B + LoRA.
• Decision Fast (FlyMy.AI) by FlyMy.AI. Decision Fast (FlyMy.AI) is an independent open reproduction of the Jev decision-model approach, by FlyMy.AI. Built on Qwen3-0.6B-Base + LoRA.
• decision-machine-1 by milliseconds.ai. A hosted decision API from milliseconds.ai. Its weights are not published.
• Decisions API by OpenAI. OpenAI's beta decision API running on gpt-6-luna. Accepts text plus base64 images. Uses OpenAI's own schema, not Jev-compatible. OpenAI claims ~10x faster than the Responses API.
• djev by Maisa (David Villalón). djev is an independent open reproduction of the Jev decision-model approach, by Maisa (David Villalón). Built on DiffusionGemma 26B-A4B. Benchmarked in several versions; see the scores below.
• Drex by Nace.AI. Nace.AI's hosted decision models, in three versions: Drex Max, Drex 2.0 and Drex 1.5. DecideBench measured Drex Max as its most accurate decision model.
• elephant-1. A decision model scored on the Artificial Analysis Decision Index. Its maker isn't named in the sources checked.
• GLiDE by Fastino. Fastino's decision model, scored on the Artificial Analysis Decision Index.
• GLiNER2.5-Decide by Fastino. A 340M decision variant of Fastino's GLiNER2.5 encoder, measured by DecideBench.
• Hopper by HopitAI. Hopper is an independent open reproduction of the Jev decision-model approach, by HopitAI. Built on Qwen3.5-4B + LoRA.
• Imajev by mohit67890. Imajev is an independent open reproduction of the Jev decision-model approach, by mohit67890. Benchmarked in several versions; see the scores below.
• Instinct by ZooWork. Instinct is an independent open reproduction of the Jev decision-model approach, by ZooWork. Built on Qwen3.8-27B.
• jeff by Logan Markewich. jeff is an independent open reproduction of the Jev decision-model approach, by Logan Markewich. Benchmarked in several versions; see the scores below.
• Jev by TypeSafe AI. The original decision model. Takes a state and a set of possible answers and returns a probability score for each option in parallel — no text generation. Reported 20–200x faster and 40–1000x cheaper…
• JEV Qwen3.5-9B NVFP4 by WilfLin. JEV Qwen3.5-9B NVFP4 is an independent open reproduction of the Jev decision-model approach, by WilfLin. Built on Qwen3.5-9B Base.
• jev-local by us (GitHub). jev-local is an independent open reproduction of the Jev decision-model approach, by us (GitHub). Built on Qwen3.5-9B (frozen).
• Jev-Omni by akhilaaa3. Jev-Omni is an independent open reproduction of the Jev decision-model approach, by akhilaaa3. Built on Gemma-4-12B-it.
• JevAct by einptein. JevAct is an independent open reproduction of the Jev decision-model approach, by einptein.
• JevK5 by allebee. JevK5 is an independent open reproduction of the Jev decision-model approach, by allebee. Benchmarked in several versions; see the scores below.
• JevOne by Juspay. JevOne is an independent open reproduction of the Jev decision-model approach, by Juspay. Built on Qwen3.6-35B-A3B.
• Jobe by MantisShrimpdev. Jobe is a runtime that reads decisions straight from a language model's output probabilities, by MantisShrimpdev. Built on Qwen3.5-4B (frozen).
• jqv by Octalab. jqv is an independent open reproduction of the Jev decision-model approach, by Octalab. Built on Qwen3-32B.
• Julia-1 by Supersonic Labs. A 144M-parameter open decision model from Supersonic Labs, built on the mmBERT-small encoder. Runs on a CPU, and an ONNX build runs in the browser.
• Kev by Independent (open-source). Open-source Jev-architecture alternative with full architecture documentation.
• Laya by Independent (open-source). Community open-source decision model with a published architecture you can run locally. One of the first Jev-architecture clones.
• lev by Franck Verrot. lev is an independent open reproduction of the Jev decision-model approach, by Franck Verrot. Built on LFM2.5-350M + LoRA.
• LitJev by Zhengxu Yu. LitJev is an independent open reproduction of the Jev decision-model approach, by Zhengxu Yu. Built on Qwen3.8-27B (frozen).
• local-jev by Amith Chandrappa (amithgc). local-jev is an independent open reproduction of the Jev decision-model approach, by Amith Chandrappa (amithgc). Built on Qwen3.5-4B.
• Malkuth by newfull5 (dhtocks). Malkuth is an independent open reproduction of the Jev decision-model approach, by newfull5 (dhtocks). Built on Kev post-train. Benchmarked in several versions; see the scores below.
• metask-jev by Wayfind (metask-ai). metask-jev is an independent open reproduction of the Jev decision-model approach, by Wayfind (metask-ai). Built on Qwen3.5-4B.
• Microsoft-Decision-1 by Microsoft. Microsoft's decision model, scored on the Artificial Analysis Decision Index.
• Mirror by Bluusun. Mirror is an independent open reproduction of the Jev decision-model approach, by Bluusun. Built on DeBERTa-v3-large.
• Nimble by Independent (open-source). Lightweight open-source decision model focused on low-latency inference on commodity hardware.
• NInfer by Igor L. / NInfer contributors. NInfer is a runtime that reads decisions straight from a language model's output probabilities, by Igor L. / NInfer contributors. Benchmarked in several versions; see the scores below.
• Open Jev JSON Canvas by JoshuaSP. Open Jev JSON Canvas is an independent open reproduction of the Jev decision-model approach, by JoshuaSP. Built on DiffusionGemma 26B-A4B.
• Open Spark Jev by Abhishek Rai (abhishek085). Open Spark Jev is an independent open reproduction of the Jev decision-model approach, by Abhishek Rai (abhishek085). Built on Qwen3.5-4B + LoRA.
• open-alternative-jev by IkerMoel. open-alternative-jev is an independent open reproduction of the Jev decision-model approach, by IkerMoel. Built on Qwen3.5-4B (frozen).
• Open-Jev (Zefan Cai) by Zefan Cai. Open-Jev (Zefan Cai) is an independent open reproduction of the Jev decision-model approach, by Zefan Cai. Benchmarked in several versions; see the scores below.
• open-jev-deberta-v3-large by Kotoba Labs. open-jev-deberta-v3-large is an independent open reproduction of the Jev decision-model approach, by Kotoba Labs. Built on DeBERTa-v3-large.
• OpenDecision by Deepan Wadhwa. OpenDecision is a decision model, by Deepan Wadhwa. Built on ModernBERT-large (zero-shot).
• OpenJev (razorback16) by razorback16 / Codiv. OpenJev (razorback16) is an independent open reproduction of the Jev decision-model approach, by razorback16 / Codiv. Built on DiffusionGemma 26B-A4B. Benchmarked in several versions; see the scores…
• openJev Verdict by Hemant (heman10x). openJev Verdict is an independent open reproduction of the Jev decision-model approach, by Hemant (heman10x). Built on GLiClass ModernBERT-base. Benchmarked in several versions; see the scores below.
• openjev-sglang by ekzhang. openjev-sglang is an independent open reproduction of the Jev decision-model approach, by ekzhang. Built on Qwen3.6-35B-A3B.
• OpenSourceJev by sabeel111. OpenSourceJev is an independent open reproduction of the Jev decision-model approach, by sabeel111. Built on Qwen3.5-4B.
• Plumb by crh225. Plumb is an independent open reproduction of the Jev decision-model approach, by crh225. Built on JevK5 v0.2 + LoRA.
• pplx-decider by Perplexity. Perplexity's open-weights decision model. The only alternative that published a head-to-head accuracy win over Jev on a vendor benchmark.
• Quyet-1.0-Large by Decision Models. A decision model served on the Decision Models API (decisionmodels.io), a Jev-compatible host for open decision models.
• Qwen3.5-0.8B Decision Model by Mourad Ghafiri. Qwen3.5-0.8B Decision Model is an independent open reproduction of the Jev decision-model approach, by Mourad Ghafiri. Built on Qwen3.5-0.8B-Base.
• Qwen3.5-9B Jev-like data-mix by jsaurabh. Qwen3.5-9B Jev-like data-mix is an independent open reproduction of the Jev decision-model approach, by jsaurabh. Built on Qwen3.5-9B.
• REAX 1 by REAX (Decision Models). A 27B decision model fine-tuned from Perplexity's pplx-decider-v1.2, served on the Decision Models API (decisionmodels.io).
• reflex by kshetrajna12. reflex is an independent open reproduction of the Jev decision-model approach, by kshetrajna12. Benchmarked in several versions; see the scores below.
• Rizzo Flow by Rizzo AI Academy. A LoRA adapter on Spark-X2.5-4B. Serves a native /v1/decisions and a Jev-compatible /v1/systemone. Uncalibrated by default.
• s1-fast by Decision Models. The low-cost decision model on the Decision Models API (decisionmodels.io), a Jev-compatible host for open decision models.
• s1-pro by Decision Models. A decision model on the Decision Models API (decisionmodels.io, formerly System1 Models), a Jev-compatible host for open decision models.
• SemIf by Independent (open-source). Semantically-conditioned inference decision model — open weights, runs locally.
• SimpleJev by Featherless AI. SimpleJev is an independent open reproduction of the Jev decision-model approach, by Featherless AI. Benchmarked in several versions; see the scores below.
• smalljev by Aditya (isHeSatoshi). smalljev is an independent open reproduction of the Jev decision-model approach, by Aditya (isHeSatoshi). Built on MiniCPM5-2B-Base + LoRA.
• Snowflake Decision by Snowflake. Snowflake's decision model inside Cortex AI Functions, called from SQL with AI_COMPLETE for classification, scoring, filtering and routing. In private preview by request through a Snowflake account…
• Snowflake Decision Fast by Snowflake. A lower-latency variant of Snowflake Decision for interactive workloads, in private preview. Available through AI_COMPLETE in SQL and through Cortex AI Gateway's REST API.
• Span-01 by Respan. Respan's open-weight decision model with a Jev-compatible endpoint.
• Standard One by Standard Thinking. Standard One is an independent open reproduction of the Jev decision-model approach, by Standard Thinking.
• Strands Decider 2B by AWS (Strands Labs). An open decision model from AWS Strands Labs, built on Qwen3.5-2B-Base after Marc Brooker prototyped it from studying Jev. Runs locally; AWS reports under 100 ms per decision on an RTX 3090 (vendor).
• SubQ Snap. A decision model scored on the Artificial Analysis Decision Index (version 1.1). Its maker isn't named in the sources checked.
• swanOne by blockbrain. swanOne is an open "System One" style decision model, by blockbrain. Built on Qwen3.8-Flash-Next.
• system-one (Sean Goedecke) by Sean Goedecke. system-one (Sean Goedecke) is an independent open reproduction of the Jev decision-model approach, by Sean Goedecke. Built on Qwen3-8B (frozen).
• system-one-open by mithalouni. system-one-open is an independent open reproduction of the Jev decision-model approach, by mithalouni. Built on Gemma 4 E2B + LoRA.
• TEV by Together AI. Together AI's open decision model (also listed as Tev1), fine-tuned on Qwen3.5-4B. Runs on Together's API or self-hosted.
• typecastlm by Mikhail Gribov. typecastlm is an open "System One" style decision model, by Mikhail Gribov. Built on Qwen3.5-4B.
• verdict-small by Manavarya09 (Manav). verdict-small is an independent open reproduction of the Jev decision-model approach, by Manavarya09 (Manav). Built on multilingual-e5-small.
• Von by wfzyx (Victor Hugo). Von is an independent open reproduction of the Jev decision-model approach, by wfzyx (Victor Hugo).
• Winnow by Eldan Ring. Winnow is an independent open reproduction of the Jev decision-model approach, by Eldan Ring. Built on Gemma-4-12B-it.
• yev0. A 4B self-hosted decision model measured by DecideBench. Its maker isn't named in the sources checked.