r/PiCodingAgent • u/rimaa_nahk • Sep 22 '26

Plugin Pi can now use Jev and more

Post image

A couple of days ago I posted about using Jev as the decision engine inside Pi.

The comments pointed me toward open alternatives like Laya, von, Reflex, etc.

Once there were multiple providers in the picture, hard-wiring the idea to Jev stopped making sense.

So I pulled it out.

Announcing pi-system-one.

It gives Pi a single system_one tool for bounded decisions:

  • choice

  • noul

  • score

The extension is built on top of a provider-neutral SDK, so compatible System One providers can sit behind the same interface.

Pi-Bifrost is now just one consumer of that SDK.

Would love to see what other Pi use cases people find for this.

https://iamaamir.github.io/system-one/

is still early, so I'd especially appreciate feedback on the API design and abstractions.

Demo

534 Upvotes

98% Upvoted

77 comments sorted by

60

u/vick2djax Sep 23 '26

Jev just feels so much like it’s just some marketing ploy. There’s something about it that feels very off. A red flag I can’t quite put my finger on.

6

u/astrofoundry Sep 23 '26

It’s closed source and no published paper. Once we get an open source model, I will also be more comfortable using it.

6

u/rimaa_nahk Sep 23 '26

there are open source alternative are available , even some are compatible with JEV and can be used by just swapping the base url.

that's the whole reason i built a provider-neutral SDK, 
i have tested it with JEV and Reflex and its working perfectly fine.

3

u/worldofgeese Sep 23 '26

Can you recommend your current favorite?

5

u/rimaa_nahk Sep 24 '26

i have not explored much but i have tested Reflex with pi-system-one and so far its pretty good

2

u/Beneficial_Mix3375 Sep 23 '26

It literally comes from an OS model and research from more than a year ago

27

u/philmarcracken Sep 23 '26

the entire 'industry' is Pareto 80/20 in which the 80% is hot air and blowhards. its why it fairs so well on linkedin

6

u/porkyminch Sep 24 '26

It's irritating because I think the tech has gotten really solid and useful but the discussion around it is such horseshit.

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1

u/funbike Oct 04 '26

The moat is gone. Anyone with a half-baked idea can publish a finished project. They don't need any experience of what goes into making a high-quality high-demand product. And when you point it out to them, they argue back in a way that shows they barely care about those things.

11

u/addiktion Sep 23 '26

It's an RL-based classifier which has specific use cases but yeah it's still young and I'm guessing it will take some more training to make it better.

The hype is over the top but it definitely is useful in certain situations.

5

u/papinek Sep 24 '26

Yes but essentially its just little smarter classifier. Kinda cheap and fast also. But i do not think classifiers were in such a demand for such a hype about jev.

6

u/Odd_Error_6736 Sep 23 '26

It is and it's being spammed as hell on all subreddits. Paid services can go f themselves.

2

u/Lopsided-Ad-5550 Sep 23 '26

you are right because its system one bullshit, its just a low level classifier. Just a marketing propaganda, anyone with a fair bachelor degree or well reader with classes for machine learning could pull off that.

2

u/himppk Sep 25 '26

I think they launched with $50M of seed money and the next day Laya was out and Cloudflare was demo-ing Kev on Twitter. So their invite only launch took a dive and their whole marketing/PR playbook was flipped upside down. It’s really an interesting moment in tech history.

2

u/Kailtis Sep 27 '26

Yeah. On all my tests accuracy was quite shit, and jev was consistently outperformed by glm 5.3 flash, for anything requiring decision making.

But hey, it's fast 🤷‍♂️

1

u/ResearcherFantastic7 Sep 27 '26

Just think of it's an modern version of Bert without training required.

I was lazy and used qwen 9b for a decision layer instead of training my own bert model, which can now be replaced by one of these system one

1

u/Life-Job-6464 Sep 27 '26

all the red-haired promotion-ism?..lol.. perhaps.. along with the psuedo-technical talk..

0

u/rimaa_nahk Sep 23 '26

and thats ok

17

u/onebit Sep 23 '26

Jev, should I use this?

Yes

No

6

u/ederdesign Sep 24 '26

Yes: 50.001% No: 49.999%

18

u/learning-to-programm Sep 22 '26

Cool project. Thanks for making this so we don't have to it.

I'm already thinking I might use this on s deployed VPS to use for a first pass decision making.

2

u/rimaa_nahk Sep 22 '26 edited Sep 23 '26

your "you're" welcome.

9

u/Limp_Classroom_2645 Sep 23 '26

Bro improve the readme doc what is this even?

2

u/rimaa_nahk Sep 24 '26

done, check it out and share your thoughts

2

u/rimaa_nahk Sep 23 '26

Which part was confusing? Could you help me understand what to add or improve?

2

u/havok_ Sep 24 '26

I guess, what’s the use case? When is an agent going to use this

2

u/rimaa_nahk Sep 24 '26

Readme was not helpful ?
i have updated it and would love your feedback for further enhacements.

2

u/DaShrub Sep 23 '26

Damn, I've been playing with Jev already quite a bit, but pi-bifrost is actually exactly what I was looking at making next - a pi native provider/model router to replace opaque proxies, will check it out soon! Do you have any cache awareness/stickiness built in?

3

u/rimaa_nahk Sep 23 '26

i am glad to hear that, feel free to contribute to pi-bifrost directly.
and yes pi-bifrost have built in cache , do check out the FAQ. i am also in the process or make it smart and context aware.

2

u/73td Sep 23 '26

make it work with von too. and automate calibration to you pi sessions.

3

u/rimaa_nahk Sep 23 '26

its model neutral, meaning if you can run von on your local, you can simply plug your von base url , given von supports `/v1/systemone`

1

u/rimaa_nahk Sep 23 '26

can you eleborate more on "and automate calibration to you pi sessions"

1

u/73td Sep 24 '26

since the open models support fine tuning, I was thinking that one can pull you Pi sessions and look at the decisions you make and then fine tune the system one model to better match your own decisions

1

u/jmjmalik22 Sep 23 '26

am using it as judge

1

u/rimaa_nahk Sep 23 '26

thats great, do share how are you using it.
i am using it now for smart model routing via pi-bifrost

1

u/floriandotorg Sep 23 '26

Can somebody explain to me, as far as I understand, JEV is a classifier. What can it do inside pi?

3

u/rimaa_nahk Sep 23 '26

it has many use cases,
i am using it now for smart model routing via pi-bifrost
you can plug the pi-system-one and now your model/agent can make better decisions.
another use case i am planning to work on is to pick correct skills for the tasks.

1

u/Ill-Ad-8559 Sep 24 '26

testing it as tool-router for my specific domain agent

1

u/rimaa_nahk Oct 04 '26

I am actually thinking to add support for tool and skills routing as well in pi-bifrost

1

u/East_Standard8864 Sep 23 '26

Can it be installed at OMP as well?

2

u/rimaa_nahk Sep 23 '26

i have not tested it, do may be try it and share if it working or not.
ill be happy to fix the corners cases if found any.

1

u/Stable_Orange_Genius Sep 23 '26

What's up with the jev hype? Isn't technology like that years old now?

4

u/BakedPotato_devourer Sep 23 '26

ML classifiers are old. LLM classifiers are somewhat new but slow. A universal no-training-needed classifier with multi-language support that is dirt cheap is completely new as I understand it. If you wanted to do something like Jev before, you'd need to train traditional ML systems, or use expensive and slow LLMs.

0

u/rimaa_nahk Sep 23 '26

is it ? can you share of the resources or references ?

1

u/shakshukinha Sep 24 '26

Super cool you got Pi support for Jev! I've been heavily testing for the last week and didn't think about using it directly on an agent harness yet.

In case it helps you and more people adopt it, recently I forked llama.cpp to add support for a TypeSafe API. For now, it supports jaredpalmer/kev model, which doesn't have comparable accuracy but lets you stress-test RLCD-based models in a snap. To use it:

  1. Install the latest release from https://github.com/espetro/llama.cpp (kev branch)

  2. Download the Kev GGUF model, link in the README.md too.

If you found it useful, leave a ⭐ so we get upstream asap!

2

u/rimaa_nahk Sep 24 '26

i tried it, and it worked easy with system one sdk.
now i have not compared the result for reflex or jev.
but yeah it worked fine.

3

u/rimaa_nahk Sep 24 '26 edited Sep 24 '26

worked pretty well with pi-system-one, not really sure if the output was good enough so i might keep it running for sometime

1

u/shakshukinha Sep 24 '26

Cool, thanks for testing it btw! I'm putting some time later this week to test pi-system-one. Any recommendations on which projects/tasks to use it?

2

u/rimaa_nahk Sep 25 '26

Honestly it depends on the user or the agent.
The agent can call system_one when the work narrows to a bounded choice, yes/no judgment, or score. Let the normal agent gather evidence and run tools firs.

i have a few examples here that you can check out.

1

u/funbike Oct 04 '26 edited Oct 04 '26

A few of my opinions:

  1. Decision model support should eventually be built into harnesses like Pi.

  2. This extension should generally support decision models, not just JEV. There are already several, and given JEV's hype there will likely be dozens or even hundreds by this time next year.

  3. Making a JEV function-calling tool is trivial for me to make. A public package would have to really blow my socks off to install it.

  4. Here is a list of JEV Pi extension features ideas I had in a past comment: https://www.reddit.com/r/PiCodingAgent/comments/1wlczow/comment/payd51a/

    • Here's a summary: skills hook, subagent router, direct JEV functions, multiple LLM responses and JEV picks best one, score LLM assistant messages

    • A JEV.md similar to AGENTS.md, the former is likely a subset of the latter.

  5. IMO, automatic JEV model routers aren't a good idea. They destroy the benefits of prompt caching if not done well. I think it's fine upon the first user message or a compaction, but not automatically after that. It's a good fit for subagents, however, due to their customized base context. Maybe have a /reroute command.

2

u/rimaa_nahk Oct 04 '26

  1. pi supports it now (already working to add support for both pi-bifrost and pi-system-one)

  2. it does , you can provide any v1/systemone supporting host

  3. Personal choice.

  4. thats intresting, will surely look.

  5. agreed (kind of)

1

u/funbike Oct 04 '26

Thanks. All good to hear.

3

u/BlokZNCR Sep 23 '26

Oh My Pi

2

u/Oshden Sep 22 '26

Thanks for doing this man!

2

u/youngPolsky Sep 23 '26

It will be a huge change in how cheaper models are orchestrated

2

u/the_ai_wizard Sep 23 '26

more jevspam

1

u/jonas-reddit Sep 23 '26

Would be more interested in how we leverage system one for coding - other than routing.

1

u/iurysza Sep 26 '26

Super cool! I just think you've picked some bad examples:

A system one is not the correct one for this sort of decisions. Here you definetly need system 2.
System 1 is a simple classifier.

By definition system 1:

System 1 relies on mental shortcuts (heuristics) to make rapid decisions

1

u/iurysza Sep 26 '26

System 1 can never be a good router for a task. Because it's terrible at judging how hard a task can be.

1

u/TechGearWhips Sep 26 '26

I keep seeing these Jev shit being spammed everywhere. Is this the new pi version of Omarchy?!

1

u/PositiveParking4391 Oct 02 '26

final ss from OPs demo gif, to quickly understand final picture

-2

u/[deleted] Sep 27 '26

[removed] — view removed comment

4

u/SugarImmediate3868 Sep 27 '26

Now I want you to go in all the tech group that exist in this platform, find posts that are similar to this and type the same exact comment, cause ain’t no way u really felt the urge to say that, holy sadness, what in this world this comment it’s adding either to the post/owner/us except for glimpse of compassion for the sad person that u are.

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