20 Jev Alternatives: The Decision Models Taking On TypeSafe in 2026

TypeSafe launched Jev on September 15, 2026. It is a decision model, not a chatbot. You define the allowed answers, and Jev returns a label, a score or a yes/no probability. In about 4 weeks, at least 20 Jev alternatives shipped. They come from Cloudflare, OpenAI, Perplexity, Liquid AI, AWS’s Strands Labs and independent developers. This guide compares each one on size, license, hardware, pricing, Jev API compatibility and published benchmarks.

TL;DR

• Size range: 287M (GLiNER2.5-multi-Decide) to 35B-A3B (Mapika Decider). Jev’s size is not disclosed.
• Runs on: Encoders like Von and Laya run on CPU. 4B adapters fit a 24 GB GPU or a 32 GB Mac.
• Performance: Most open models trail Jev on hard reasoning. Several match or beat it on narrow classification.
• Best: Cloudflare Clef scores 94.20 BANKING77 F1 versus Jev’s 79.74, per Cloudflare’s own run.
• Worst: Von 1.2 scores 0.422 accuracy in Respan’s run, against Jev’s 0.932.

What is Jev, and why look for alternatives?

Jev is TypeSafe’s first ‘System One’ model. You send a state, such as a ticket or log line. You also send typed questions: Choice, Score or Noul (yes/no). Jev scores every question in one parallel pass and generates no text.

TypeSafe’s docs list $0.042 per 1M input tokens, with free output. Context is 64k tokens per request. Input is text only. Weights are closed, and access runs through a waitlist. TypeSafe’s workflow evals put Jev at 67.8% agreement and 0.4 s per case.

That leaves 4 gaps developers keep raising: no images, no self-hosting, no published size and no fine-tuning. The 20 models below fill some or all of them.

How should you read these benchmarks?

Most figures below are self-reported. The suites differ: JevBench, Decision Index, typed-decisions and Respan’s behavior benchmark. Scores across suites are not comparable. The one multi-model third-party table comes from Respan, which sells a competing model.

Hosted decision APIs

1. Cloudflare Clef and Clef-flash

Cloudflare announced Clef on October 1, 2026. Clef is 27B on Qwen3.8-27B with a vision encoder. Clef-flash is 9B on Qwen3.5-9B. Both are Apache-2.0 on Hugging Face and served on Workers AI. They accept text, JSON and up to 4 images per request.

Workers AI pricing is $0.24 (Clef) and $0.038 (Clef-flash) per 1M input tokens. Cloudflare calls the API fully Jev-compatible. In its own run, Clef scored 94.20 BANKING77 F1 versus Jev’s 79.74. Jev still wins GPQA Diamond, 78.3 versus 48.0.

2. Liquid AI d1

Liquid AI’s d1 family has hosted d1 and d1-ultra, plus 2 open models. d1-3B (3.1B) runs on LFM2.5-VL-3B. d1-omni-600M (587M) adds audio clips up to 30 s. The open weights use the LFM Open License.

Liquid’s guide calls d1 through TypeSafe’s own SDK with a different base URL. Liquid reports d1-3B at 48.57 on Decision Index 0.2.1. It also reports 8 ms latency on an RTX 4090. Hosted parameter counts and paid rates are not disclosed.

3. OpenAI Decisions API

OpenAI released the Decisions API in public beta on October 6, 2026. It runs only on gpt-6-luna. It accepts text plus base64 images. Question types are predicate, choice and score.

Pricing is $0.10 per 1M input tokens, with output not billed. The schema is OpenAI’s own, so it is not Jev-compatible. OpenAI claims about 10x faster responses than the Responses API. No benchmarks are published.

4. Perplexity pplx-decider

Perplexity’s pplx-decider-v1-27b is a Qwen3.8-27B fine-tune under Apache-2.0. It reads text, JSON and up to 8 images per question. The API allows 128 questions and 255 options per request.

The current pricing is $0.02 per 1M input tokens for v1.2 (27B). A 4B flash-v1.2 costs $0.01. On Perplexity’s 11-task panel, it scored 85.71% versus Jev’s 84.51%. Jev still won BBH, 94.27 versus 82.80.

5. meraGPT Decider 1

meraGPT announced Decider 1 on September 22, 2026. It is a hosted, closed-weight, text-only model. It allows up to 10 Choice labels and a 4,096-token context. The model page lists $0.04 per 1M input tokens.

It exposes /v1/systemone and works with the TypeSafe SDK. On meraGPT’s typed-decisions run, it scored 0.768 versus Jev’s 0.727. An independent review notes its ECE of 0.180 trails Jev’s 0.144.

6. Respan Span-01

Span-01 is a behavior-scoring model, not a general decision model. It returns present, absent or not_observable probabilities. It costs $0.02 per 1M input tokens. Span-01 Lite is free.

Respan claims 0.843 overall F1 on its Behavior Benchmark. Its own blog table shows a lower 0.806, with GPT-6 Sol ahead at 0.885. Size, base model and license are not disclosed.

7. Standard Thinking Standard One

Standard One ships as 3B and 8B models, both open and hosted. The 8B is a LoRA on Ministral-3-8B under Apache-2.0. It reads text and images, with a 32,768-token context. It serves /v1/systemone.

Hosted text pricing is $0.018 (3B) and $0.035 (8B) per 1M tokens. On JevBench public hard, the 8B scored 54.95% versus Jev’s 72.07%. It led on realistic transfer, 90.83% versus 86.67%. Both runs are publisher-measured.

Open-weight Jev alternatives you can self-host

8. Together AI Tev1-4B-experimental

Together trained Tev1 as a LoRA SFT of Qwen3.5-4B. It cost about $17 and 25 minutes on 37,840 examples. It picks from 2 to 24 options. The model card says the weights license is still being finalized.

It answers through chat completions, not a native Jev endpoint. Respan measured 0.901 accuracy and 0.031 ECE, the best ECE in its table. Together warns its logprobs are not calibrated confidence.

9. Fastino GLiNER2.5-Decide

Fastino’s GLiNER2.5-Decide is a 340M DeBERTa-v3-large encoder under Apache 2.0. It handles decisions, span extraction and relations in one pass. A 1B and a 287M multilingual variant also exist.

On Fastino’s 17-domain set, the model card lists 60.2% exact match. p50 latency is 167.3 ms on a 48-vCPU Xeon. It is not Jev API-compatible.

10. Strands Labs Strands Decider 2B

AWS’s Strands Labs introduced Strands Decider on October 1, 2026. It is about 1.9B: Qwen3.5-2B-Base plus a pointer head. The repo publishes 246,678 training rows and the full recipe. One RTX 3090 trains it in about 11 hours.

It serves a local /v1/systemone endpoint under Apache-2.0. The v1 checkpoint scored 180 of 231 (77.9%) on JevBench public. Median latency is 115 ms on an RTX 3090.

11. Kev (Jared Palmer)

Kev comes in 0.8B, 4B, 9B and 27B sizes on Qwen3.5 and Qwen3.8. Kev-4B is a LoRA plus pointer head under Apache-2.0. It supports 255 options. The TypeSafe SDK works against it unchanged.

Kev-4B fits a 24 GB GPU or a 32 GB Apple Silicon Mac. Respan measured 0.833 accuracy and a 0.060 flip rate. Self-reported MMLU-Pro is 0.565 versus Jev’s 0.840. Option order can change its answers.

12. Mapika Decider family

Mapika’s Decider ships 0.8B to 35B-A3B variants on Qwen3.5 and Gemma 4. A decider-2b-vision model adds images. Everything is Apache-2.0, with 32k context and /v1/systemone.

On the JevBench public hard tier, decider-12b v1 tied Jev at 0.730. The 4B GGUF Q4_K_M is 2.7 GB and runs on CPU. The 4B’s ECE is 0.184 on hard items, so expect overconfidence.

13. Bespoke Labs Bespoke-Nimble-9B

Bespoke-Nimble-9B is a 165 MiB LoRA on Qwen3.5-9B, Apache-2.0 on Hugging Face. The current card lists 255 choices and 8,192 tokens. It reads English text only.

On Bespoke’s 324-example held-out set, Nimble scored 90.12% versus Jev’s 93.21%. Latency is about 106 ms on an H100. It trained on only 2,676 examples, and its probabilities are not calibrated.

14. Convai Innovations Laya

Laya is a ModernBERT-based family with 421M English and 322M multilingual checkpoints. It is Apache-2.0 and text only. The laya-serve server exposes a Jev-shaped /v1/systemone endpoint.

The typed-decisions checkpoint scored 0.766 versus Jev’s 0.727. On Banking77, it scored 0.425 versus 0.870. Respan measured 0.542 accuracy and a 0.396 injection success rate. p50 latency is 32.8 ms on a T4.

15. Von (wfzyx)

Von is a 395M ModernBERT-large encoder with an option-marker head. It scores all options in one bidirectional pass. It is Apache-2.0 with an 8,192-token context.

The repo reports 0.096 s p50 on 4 vCPUs and 0.023 s on an A10G. Respan measured Von 1.2 at 0.422 accuracy, the lowest in its table. Its calibration is tuned to JevBench and can mislead out of domain.

16. Open-Jev-9B (Zefan Cai)

Open-Jev ships 2B, 9B and 27B adapters on Qwen3.5 bases. Open-Jev-9B adds a scalar head and fits one 16 GB GPU. It matches the /v1/systemone request shape but claims no parity.

On a 231-task JevBench subset, the project reports 77.49% for 9B and 85.28% for 27B v1.1. Each candidate is capped at 4,096 tokens. Numeric and timeline tasks are weak.

17. OpenJev on DiffusionGemma (razorback16)

This OpenJev reads decisions from NVIDIA’s DiffusionGemma 26B-A4B (4B active). It accepts text plus up to 8 images. It uses the same wire API, so Jev SDKs work unchanged.

The project reports 87.4% on JevBench public and 30 ms p50 at 49 tokens. A free hosted endpoint gives 100M tokens per account. Self-hosting needs an NVIDIA GPU with at least 24 GB.

18. InnerJev-4B and InnerJev-27B

InnerJev comes from a Fudan, Tongji and King’s College London team. It distills LLM reasoning into a single-pass decision. The paper also introduces JEVal: 11,257 instances across 36 datasets.

On JEVal, InnerJev-27B scored 79.24% versus Jev’s 78.38%. Its ECE was 0.0149 against Jev’s 0.0532. InnerJev-4B scored 71.92%. Code is on GitHub; the license is not stated.

19. SemIf

SemIf reads typed decisions from existing open LLMs, with Qwen3.5-4B as the default. A WebGPU demo runs quantized models in the browser. Code is MIT.

On a 102-row TypeSafe subset, SemIf scored 0.845 balanced accuracy versus Jev’s published 0.883. On an RTX 3090, direct logits took 1.023 s versus 5.332 s for JSON generation. It has no Jev-compatible endpoint.

20. Rizzo Flow

Rizzo Flow from Rizzo AI Academy is a LoRA on Spark-X2.5-4B under Apache-2.0. It serves a native /v1/decisions and a Jev-compatible /v1/systemone. Choice is capped at 26 options.

On 400 typed-decisions cases, it scored 0.648 versus the base model’s 0.574. Jev’s dataset-card figure is 0.727. It is uncalibrated by default.

What does the only multi-model third-party run show?

Respan used its Span-01 judge to score 11 models. Lower is better for every column except accuracy.

Model	Accuracy	Paired flip rate	Injection ASR	ECE
Jev 1.13.0	0.932	0.021	0.063	0.045
Tev1 4B	0.901	0.052	0.042	0.031
Kev 4B	0.833	0.060	0.078	0.070
Decider 2B v10	0.747	0.128	0.208	0.074
Laya	0.542	0.298	0.396	0.092
Von 1.2	0.422	0.242	0.297	0.071

Source: Respan, October 16, 2026. Tev1 beat Jev on injection resistance and calibration. Jev led accuracy and consistency.

Jev alternatives comparison table

#	Model	Org	Size	License	Inputs	Jev API	Price (per 1M input)	Key result (source)
Ref	Jev 1.13	TypeSafe	Not disclosed	Closed	Text	Native	$0.042	0.932 acc (Respan)
1	Clef / Clef-flash	Cloudflare	27B / 9B	Apache-2.0	Text, images	Yes	$0.24 / $0.038	94.20 BANKING77 F1 (vendor)
2	d1 family	Liquid AI	587M to 3.1B open; hosted not disclosed	LFM Open	Text, images, audio	Via TypeSafe SDK	Not disclosed	48.57 Decision Index (vendor)
3	Decisions API	OpenAI	Not disclosed	Closed	Text, images	No	$0.10	Not published
4	pplx-decider	Perplexity	27B / 4B flash	Apache-2.0	Text, images	No	$0.02 / $0.01	85.71% vs Jev 84.51% (vendor)
5	Decider 1	meraGPT	Not disclosed	Closed	Text	Yes	$0.04	0.768 typed-decisions (vendor)
6	Span-01	Respan	Not disclosed	Not stated	Text	Not stated	$0.02 (Lite free)	0.843 F1 (vendor)
7	Standard One	Standard Thinking	3B / 8B	Apache-2.0	Text, images	/v1/systemone	$0.018 / $0.035	54.95% JevBench hard (vendor)
8	Tev1-4B-experimental	Together AI	4B	Being finalized	Text	No	$0.042 (OpenRouter)	0.901 acc (Respan)
9	GLiNER2.5-Decide	Fastino	340M	Apache 2.0	Text	No	Not disclosed	60.2% exact match (vendor)
10	Strands Decider	Strands Labs (AWS)	~1.9B	Apache-2.0	Text	/v1/systemone	Free, local	77.9% JevBench public (project)
11	Kev-4B	Jared Palmer	0.8B to 27B	Apache-2.0	Text	Yes	Free, local	0.833 acc (Respan)
12	Decider family	Mapika	0.8B to 35B-A3B	Apache-2.0	Text, images (2B)	Yes	Free, local	0.730 JevBench hard, 12B (project)
13	Bespoke-Nimble-9B	Bespoke Labs	9B	Apache-2.0	Text	Not stated	Free, local	90.12% vs Jev 93.21% (vendor)
14	Laya	Convai Innovations	322M / 421M	Apache-2.0	Text	Yes	Free, local	0.542 acc (Respan)
15	Von	wfzyx	395M	Apache-2.0	Text	Not stated	Free, local	0.422 acc (Respan)
16	Open-Jev-9B	Zefan Cai	2B to 27B	Apache-2.0	Text	Request shape only	Free, local	77.49% JevBench subset (project)
17	OpenJev (DiffusionGemma)	razorback16	26B-A4B	Apache-2.0 (code)	Text, images	Yes	Free tier, 100M tokens	87.4% JevBench public (project)
18	InnerJev	Academic team	4B / 27B	Not stated	Text	Not stated	Free, local	79.24% vs Jev 78.38% JEVal (authors)
19	SemIf	TheoLeeCJ	0.6B to 4B (base LLMs)	MIT (code)	Text	No	Free, local	0.845 vs Jev 0.883 (author)
20	Rizzo Flow	Rizzo AI Academy	4B / 1.7B	Apache-2.0	Text	Yes	Free, local	0.648 typed-decisions (author)

Which Jev alternative should you choose?

• Need images: Clef, pplx-decider, Standard One or the DiffusionGemma OpenJev.
• Need a drop-in Jev swap: Clef, Kev, Decider, meraGPT or Laya expose /v1/systemone.
• Need CPU or edge: Von, Laya, GLiNER2.5-Decide or Liquid’s d1-omni-600M.
• Need to train your own: Strands Decider and Together’s Tev1 publish full recipes.
• Need the cheapest hosted call: Perplexity’s flash-v1.2 at $0.01 per 1M input tokens.

Whatever you pick, test it on your own labeled data first. Decision models can return a valid answer that is still wrong.

Key Takeaways

• 20 Jev alternatives shipped within roughly 4 weeks of Jev’s launch.
• Clef, pplx-decider and Standard One add the image input Jev lacks.
• Perplexity’s flash-v1.2 undercuts Jev at $0.01 per 1M input tokens.
• In Respan’s run, Jev still leads accuracy at 0.932.
• Almost every score is vendor-run, so benchmark on your own data.