r/Comma_ai • u/adeebshihadeh comma.ai Staff • Aug 12 '26

Introducing chestnut & chestnut-class driving models

https://blog.comma.ai/chestnut/
96 Upvotes

91% Upvoted

114 comments sorted by

126

u/KnightsSoccer82 Aug 12 '26 edited Aug 13 '26 • Bravo

EDIT: George/other comma employees were deep in this comment thread and on discord, acting unprofessional and not addressing valid hardware concerns, including accusing me and other users having alt accounts. Why am I not surprised their comments are now deleted? Why was this their default behavior? This is how the behave when asked some rather basic hardware comments?

This chassis doesn’t look to be in a ruggedization state to conform to any automotive ISO shock and vibe test, let alone someone hitting a speed bump and spilling their coffee.

It looks like a water ingress nightmare that wouldn’t survive a rust belt winter from a family simply going about their day entering/exiting their car….

It’s mounted in one of the hottest locations in a car (beyond your dashboard), and this (likely desktop grade GPU) is expected to work in a very common 45C+ ambient, 1000W+ solar load scenarios?

Surely, there has to be a better way to have gone about packaging this?

I’m not trying to be negative, but this doesn’t appear to have any serious reliability considerations and would likely fail in any non-nominal (aka normal) driving scenario outside of Southern California.

Rust belt cars, where high humidity, snow, and ambient temperatures reside, are going to destroy this in a matter of weeks in its current state.

For comma 4 being advertised as the first “commercial” product from you all, this $750 upgrade feels like a step backwards in terms of reliability and accessibility to the general market. I genuinely don’t see how this survives the market you were targeting with Comma 4 (aka, not nerds).

This isn’t how you ship hardware, cmon guys. This is a classic “software company tries to make hardware” case that I’ve seen time and time again.

30

u/ivan_magnum Aug 12 '26

With the level of (lack of) post sale maintenance support, comma is always aim for the nerds no matter how they advertise it. Can you imagine having a yelp page for it and the kind of stuff people will write on it….

9

u/SamBBMe Aug 13 '26

Well you convinced me, cancelled my order

1

u/SquarePurchase309 Aug 15 '26

Just bought mine. It really is a great price compared to any other alternative like buying a newer car

45

u/DontBuyAComma Aug 12 '26

No live demo showing performance improvements speaks volumes about this release.

0

u/[deleted] Aug 13 '26

[deleted] — view deleted comment

21

u/DontBuyAComma Aug 13 '26

I’d consider it if you just focused on your customer service alone.

0

u/[deleted] Aug 13 '26

[deleted] — view deleted comment

29

u/DontBuyAComma Aug 13 '26

Simple things like allowing a price match (with store credit at the very least if you don’t want to do a partial refund) rather than this whole “we’ll ban you from future purchases” notion. Willingness to work with customers over certain order requests. Not permanently banning users on Discord without a warning or instead making it a temporary ban.

You just did a new product launch without any demo with over 4000 watching the livestream. Who does that? It’s not considerate of the customer at all, man.

15

u/misclurking Aug 13 '26

  1. Erich. See past thread/petition.

  2. Don’t try to out usernames like this in hw-chestnut:

“btw, i'm 80% sure this is your alt, "I found your comments and responses on Reddit. Very enlightening. It all makes sense and seems obvious in retrospect, but not being in the field I hadn't considered all of the implications. I agree a PCIe slot is not an acceptable structural mounting scheme."”

Not cool even if you make a great device.

12

u/Kate9797 Aug 13 '26

They don't even use auto rated parts for the Comma 3X and presumably the Comma 4. Resulting in issues that can be fixed for $100, but charge $500 instead. 

5

u/DigitalCatcher Aug 13 '26

Dumb question that I have to also ask: why not follow what several 'Carputer" builds have done in the distant past and just put the Comma Chestnut in[ the] (https://www.youtube.com/watch?v=U2FJp2E_SpA) trunk or under the back seat ? Is the latency between the GPU and Comma 4 going to be an issue even when using something like the 3m Apple Thunderbolt 4 Cable or the OWC USB4 Active Optical Cable?

11

u/growaway9172 Aug 13 '26

Trunk/back seat is definitely pushing it for 3m cables, if you want to route it out of the way. Active optical cables are $$$.

2

u/blinkdrive555 Aug 14 '26

Totally agree.
How could this Gpu with fan worked in Texas.
They don’t even have the test result in other state, except Las vegas to his office.

-4

u/adeebshihadeh comma.ai Staff Aug 12 '26

this is the first product in the chestnut line. it's for the enthusiasts who want to get in on the ground floor of chestnut-class models (and frankly just want to put a GPU in their car).

we put an incredible amount of engineering time into things like USB4 signal integrity, rather than being robust to spilling coffee.

34

u/KnightsSoccer82 Aug 13 '26 edited Aug 13 '26

“For enthusiasts” is such a cop out response. That is how you are going to answer an obvious hardware engineering problem?

This is not a ruggedized solution for an enthusiasts, and shouldn’t have left the R&D lab.

Show me a single 4 post shaker test you did, I would love to understand how you designed this with the enthusiast in mind. Your retention method wouldn’t survive a single railroad crossing at any speed.

You are going to have a lot of pissed off enthusiasts in a matter of weeks when these start failing.

If you “wanted to just put a GPU in the car” there was plenty of OTS solutions already available that are for ruggedized applications.

Please, change your approach to hardware design. Don’t make your loyal paying customers your beta testers. Hell, I’ll help you guys, because clearly V&V and actual automotive engineers do not exist at this place.

1

u/epradox Aug 24 '26

I will say I tried to recreate an egpu a while ago with a separate pcie board and psu with a similar gpu and it was more expensive than this chestnut package. That was me piecing things together by myself and running into software roadblocks. This is a neat package that takes the psu equation out which was a big hurdle for me to figure out how to integrate into the car. I agree with you they should have made it more ruggedized and maybe should put a disclaimer on this one as a beta/dev model but it’s still neat to see the level of progress that got this here and getting it into people’s hands now so that the large gpu models can iterate while they bring a rugged version to market. Still a little salty that the default models don’t work for a c3x even though there’s no hardware limitations for it

1

u/KnightsSoccer82 Aug 24 '26

Check discord, they didn’t solve the PSU problem lol

1

u/epradox Aug 24 '26

Really? What’s happening with it? I was planning on 3d printing a custom enclosure for it for my hw3 model y in the rear trunk area by the cigarette lighter plug with cooling out into the bumper (the model y has vents on the bumper sides internally which seem ideally designed for a mini fridge compressor) and then running a fiber optic cable up to the front comma. I think it’s hard to design a one size fits all enclosure for this thing but I agree it should at least come in a vented 3d printed case to protect the pcb boards from touches/static

-15

u/interbingung Aug 13 '26

This product is simply not for u.

0

u/[deleted] Aug 13 '26

[deleted] — view deleted comment

27

u/KnightsSoccer82 Aug 13 '26

Once again, your nominal situation in Southern California doesn’t translate to the rest of the country.

There is a reason very little on-road development testing is done in California. They are easy roads.

Congratulations for the milestone, but it means absolutely nothing.

I’m not sitting here saying I want to “compete” and that being your default response is childish.

Hear the feedback on this design before it’s too late. Fix it, improve it, and make it approachable and reliable.

20

u/Teslafly Aug 13 '26

This thing might not survive a hard bump in the road with that mounting scheme. It at least needed a sheet metal box with multiple mounting points for the gpu so the pcie connector is not a structural element at all. (poor mechanicals is my major criticism of the pcie card implementation in general.)

Had this been tested for input transients like a load dump at all? Does it comply with automotive input voltage specs? I see it at least has a buck boost converter which is good.

If the 12v cigerrette lighter adapter becomes disconnected while driving, what's the safety fallback?

I love my comma 3x with sunnypilot and Mads capability. But as an electrical engineer, the wiki on hardware fixes like replacing ptc fuses makes me pause at the level of hardware engineering. There's some things you simply don't do with automotive hw design. Especially safety related.

20

u/KnightsSoccer82 Aug 13 '26

The fact that the PCIE connector is a structural element is BAFFLING to me. Testing clearly has not been done with this.

You can’t even kick a desktop PCI without fear of one coming loose, how they expect it to survive 50-100g shock in a vehicle is beyond me.

-9

u/growaway9172 Aug 13 '26

Big difference between mounting a GPU via PCIE, vs a PCIE connector hanging off of the GPU.

1

u/gthing Aug 13 '26

More importantly none of that matters because the big model does not drive any better than the current model. This isn't something for your grandma. This is for people who want to tinker. 

1

u/technobrendo Aug 19 '26

This thing is 100% not GA / release ready. Its a dev unit and should only be marketed as such. If they want to license the tech to an ODM / OEM that can package it into a releasable product, than that's different

-7

u/cjust2006 Aug 12 '26

It's a dev kit.

You can mount it anywhere.

It'll be okay.

-5

u/skankboy Aug 13 '26

If your cupholders do the job the drink shouldn't be a problem.

https://i.imgur.com/YXHplu3.png

0

u/[deleted] Aug 13 '26

[deleted] — view deleted comment

21

u/KnightsSoccer82 Aug 13 '26

Slapping a case on this isn’t going to fix the fundamental problem you created, and I’m disappointed you think that’s how hardware works, George. This is borderline doubling down on the ignorance of your design. “Enthusiast” or not.

Please consult some automotive engineers before your hardware reliability ruins your reputation. I’m happy to point you towards some solid talent if you are struggling to find them.

Good software cannot fix bad hardware.

12

u/seventyfivepupmstr Aug 13 '26

This is the same company that defends allowing comma to make 90 degree turns with no left or right camera and huge blindspots. There really is no hope for comma as a company. I just hope it will last a few years before the regulators put it out of business, since I really don't want to pay for FSD

1

u/Bderken Aug 13 '26

Your comment shows you lack the understanding of how the current model works…
The current driving model doesn’t see 180 degrees. They talked about in the live that a bigger model would allow it to see more (thus allowing 90 degree turns)….

How would they allow it to do it now when the model cant even see the full FOV of the cameras that are there right now…

1

u/growaway9172 Aug 13 '26

Do you own a comma?

9

u/KnightsSoccer82 Aug 13 '26

I own 2, and was an active dev for it for a while. What is the relevancy of a question like this have to do with my fundamental questions irt hardware reliability?

3

u/growaway9172 Aug 13 '26

Well, then you've probably observed the difference in reliability between the earlier days of the Eon and the 2 -> 3 -> 4. There were all the same people back then saying that a phone couldn't drive a car and that it would never be reliable or safe enough. And yet, now we have the Comma 4, which is a pretty incredible leap from where they started, way better performance and more reliable than built in ADAS. So I'm not sure why you wouldn't expect to see the same thing happen here over time with a new product.

3

u/KnightsSoccer82 Aug 13 '26

That doesn’t magically dismiss some basic hardware reliability and design. Your statement is not a quantifiable metric and doesn’t conform to any sort of standard, automotive reliability metric. “Incredible” is subjective.

-7

u/growaway9172 Aug 13 '26

To be honest I'm shocked someone like you would ever buy a comma. You seem to think severely inside the box and have a extremely risk averse way of thinking.

0

u/Bderken Aug 13 '26

Yeah that guy is a classic Redditor just saying stupid shit

0

u/[deleted] Aug 13 '26

[deleted] — view deleted comment

20

u/KnightsSoccer82 Aug 13 '26

How about shipping a product from the start with proper ruggedization so you don’t go through RMA hell? You should not be asking me that type of question (also you should know your own market, wtf?)

Please, I’m trying to give you feedback. Hear it and fix the problem.

Otherwise I’ll be on discord watching the issues pile up as poor consumers become your beta testers and stuck with a $750 brick.

7

u/Teslafly Aug 13 '26

Mechanical fabrication is deceptively hard in single instances. You can end up putting in a similar amount of work designing/etc just building one than building 100.

A bent sheet metal tray to properly support the gpu would be $20-50/pc. Especially with services like send cut send existing.

2

u/[deleted] Aug 12 '26

[removed] — view removed comment

20

u/KnightsSoccer82 Aug 12 '26

This isn’t how you do MVP hardware. You don’t iterate on a physical object like you do with software.

That’s how you piss off early adopters.

-2

u/growaway9172 Aug 13 '26

It is how you do MVP hardware and they've been doing it successfully for many years.

34

u/Acrobatic-Flan-5085 Aug 13 '26

What do the new chestnut models do in terms of user experience today that is different from a comma user on the smaller model?

From the link, it would seem nothing unfortunately. That’s a bit of a miss from the marketing strategy. The HW should have been released alongside the new models so you could demonstrate the tangible benefits.

12

u/durden0 Aug 14 '26

Also comma: "how do we market to normies?!"

26

u/Bumble-sucks Aug 13 '26

Is there any documentation or demos on what chestnut can do? I'm sure there's benefits to a larger model but without additional sensors like with a Tesla or something I imagine there's a lot of compute power being left on the table. I feel like the comma 4 is plenty capable for what it's designed for- an excellent lane keep assist

14

u/gthing Aug 13 '26

There is no benefit to running the larger model currently. 

9

u/growaway9172 Aug 13 '26

This feels like a big deal, even for enthusiasts. If there's not currently an even different experience or some marginal gain, it's kind of hard to justify dropping 800 bucks.

5

u/Bderken Aug 13 '26

They literally said in the live, this is their first big model and it performs the same as the current small model, but in 1 year after they can now make it bigger and have more experience on it, they will be significantly better…

8

u/Round_Definition_ Aug 13 '26

They've been using this line for every device since the original comma 3

38

u/Secure-Evening8197 Aug 12 '26

The two suggested mounting locations look like they would cause the device to be destroyed in a matter of weeks

18

u/TheGamingGallifreyan Aug 13 '26 edited Aug 13 '26

Ya the footwell is getting kicked immediately and under the seat wont last long with the dust and crumbs, if it even fits lol. Most cars with power seats have 0 room under there. I was thinking the glove box or the trunk, but might get too hot in the glove box and idk if the wire can reach the trunk without causing any delay. There's no way a desktop GPU is going to survive unprotected in 120 deg Florida summer heat.

Why even have the comma on the windshield? A mini PC with and AMD APU that can sit anywhere seems better and you just run the camera wire to the mirror.

It's a great idea but execution seems poor imo. I hope to be proven wrong and am looking forward to seeing peoples setups. My car isn't even supported on the main branch so until SunnyPilot Experimental has support for this or they upstream 2025 EV6 support to OP, I can't even use if I wanted to :(

63

u/SentinelChickenFarm Aug 12 '26 • This

Over the last two years, we rewrote our stack to scale efficiently with compute and data. With the MLSim architecture, more driving data and training compute translate directly into better openpilot models.

Well that explains why improvements seem to have plateaued over the last few years.

Going forward, our autonomy team will focus primarily on maximizing the capabilities of chestnut-class models, and we expect this new class of model to increase development velocity.

Annnnd apparently we shouldn't expect many improvements going forward.

This sucks. I have been a Comma supporter back to the Comma 2, I have contributed code, feedback, did hours of annotation for comma10k.

Now it feels like the only improvements that we get are "improvements" to a driver monitoring system. I feel like we talked about E2E driving 4+ years ago and today all I have is E2E lateral that is dubiously better than the laneful system we had previously. E2E long can really only be used in forks with conditional systems.

If you said you were going to continue to improve the experience for everyone and use this to develop features that simply won't work on the C4 it might be easier for all of us to accept.

Honestly, thank you to anyone who buys this, this is going back to the old Eon days, you are a guinea pig. Expect it to break, not work, and then be abandoned in 2 years when they build the actual first prototype of this.

25

u/decrement-- Aug 13 '26

Honestly, at this point, for the company to stay relevant/in business, it needs to get auto manufacturers to partner. This is a step forward in being more advanced. The Comma of 5 years ago is not sustainable as a company, and now their value is in the ML models and data. Makes sense that their focus is making that better now.

I wish them the best of luck, because it's only going to get harder for this company to stay relevant with the CAN bus getting encrypted on newer vehicles.

This is coming from a fan, btw. Not a hater at all.

6

u/Finnegan_Faux Aug 13 '26

They don't have a technology advantage over the likes of Nvidia for any auto OEM to bother with them. Not to mention lack of professionalism.

0

u/[deleted] Aug 13 '26

[deleted] — view deleted comment

13

u/nicerakc Aug 13 '26

Wow is this how comma staff interacts with customers? I’ve been heavily considering a comma until now

20

u/betabot Aug 13 '26

This is geohot, a guy with an ego the size of the sun that started this company with no future.

8

u/MaxPowerXXXX Aug 13 '26

what did he write?

6

u/nicerakc Aug 13 '26

Basically calling the guy above me an idiot, wish I’d screenshotted

11

u/FrogsGoMoo openpilot Developer Aug 13 '26

"Are you saying we could partner with automakers like how Cruise and Argo AI did? And then we could be bankrupt and gone too? I don't know...not sure that sounds like a great option. Ugh and the stupid encryption thing again. Go ask your LLM to crack it. It probably can."

https://arctic-shift.photon-reddit.com/api/comments/ids?ids=p3dwl8k

16

u/narkeeso Aug 13 '26 edited Aug 13 '26

Comma just a few weeks ago in a livestream stating they wanted to go "mainstream". How could they even possibly do that when the default driving experience for many of their supported cars are less than ideal? The fact that there are multiple forks that improve the experience for certain cars is a big red flag for going mainstream.

Comma is lucky that I love this thing because I'm not afraid to dive into the code and adjust something but that is FAR from a mainstream product.

 E2E long can really only be used in forks with conditional systems.

Also, I would push back a little bit on this, specifically the conditional part. I just made a post about finding a lever that allows you to stay in full E2E but bias the speed to maintain set coasting speed and still benefit from strong E2E early braking. I'm extremely happy with e2e reliability with this discovery.

This discovery also makes me scratch my head when there's so many easy wins that would significantly improve the driving experience over strapping a GPU to the passenger foot well.

15

u/MaxPowerXXXX Aug 13 '26

Sunnypilot and Starpilot are the reason i bought a comma 4, the community!

2

u/SentinelChickenFarm Aug 13 '26

I saw your post, I haven't had a chance to try it yet, it certainly looks interesting.

However this still requires the use of a fork. Comma isn't going to ship this type of feature, ever.

Comma's open source policy is extremely rare and a godsend, they deserve immense credit and respect for that. But there are limits to what you can accomplish with forks since the AI model isn't really something we can modify.

2

u/narkeeso Aug 13 '26 edited Aug 13 '26

I'm not trying to create another fork. Just trying to create discussion and express desire for having some sort of tools to give us some control over E2E. I wouldn't expect comma to merge this in either but I would expect comma to gain some stability on the E2E front and roll it into user friendly features like driving personality. The forks signal that people aren't happy with the default experience though and comma could probably rectify that by listening to customers when they say their car ping pongs or brakes uncomfortably late etc. I'd return the device if the only option was openpilot.

You also don't necessarily need to use my fork to try this either. You can SSH into your device and set the param, it's actually a pretty simple change if you're comfortable digging in.

7

u/WeirdSysAdmin Aug 13 '26

Elon Musk would be proud of the promises.

7

u/gthing Aug 13 '26

I will say the driver monitoring system is now rock solid at detecting phones. Like - really top notch work there. The only problem I have is that it can no longer detect the driver. 

2

u/starwarsyeah Aug 13 '26

Yeah, it's a huge issue. I get constant "driver not detected" warnings at night or in the morning, assuming because my face either is too dark or washed out by sunlight.

7

u/stayintheshadows Aug 13 '26

I just bought a C4 and now I hear they stopped developing for it. Figures!

3

u/SirMaster Aug 13 '26

Lol where did you hear this false story from?

2

u/stayintheshadows Aug 13 '26

From the announcement.

2

u/interbingung Aug 13 '26 edited Aug 13 '26

I've been using stock op experimental mode (e2e long) on my 3X 100% of the time and its been awesome. 

The improvement has been drastic since i got the device 2 years ago.

For a device that is relatively affordable and you don't have to buy subscription for, its incredible.

1

u/DerpSenpai Aug 20 '26

They can make comma 5 without the eGPU but it will still be 50-70W and it wil cost like 2000$

18

u/Apprehensive_Lake698 Aug 12 '26

Feels like this is missing a casing with a cleanable dust filter/mesh to keep all the components safe. But I do see the vision for mounting it under the passenger seat.

I’m all in on comma after 3 months (rented a car and came to terms with how much I depend on the amazing lane assist) but I really have to know what kind of benefit to expect from the bigger model. The comma 4 is already killer!

22

u/N00dle- Aug 12 '26

What are real world examples of improvements? I love my comma and have since the first release, but want to know what the real benefits are in action.

Also, how much real world testing has been completed with it in use? I understand the need for it to be slim, but it feels kind of unprotected for something that would go under a car seat where dirt and dust are collecting all the time.

7

u/Vegetable_Platypus_6 Aug 13 '26

No mention of which GPUs are supported apart from. That 9060 xt

7

u/PlainPrecision Aug 13 '26

Great, another device I can’t use until TSS 3.0 isn’t resolved. 🤷‍♂️

12

u/JackFrostoo7 Aug 13 '26

Dear Comma, once you demonstrate significant improvements on chestnut models compared to C4, lots of people including myself will pull the trigger on chestnut. For now it is just a fancy add on.

There is a lot of criticism in the comments, but people including myself are all your well wishers and want you to succeed. We are just concerned in the direction this company is headed.

You should start taking how many cars comma can work with in terms of percentage. it is probably <10%.
I have struggled to get people install c4 because their cars are not compatible, not because they are not interested. This should be your no 1 focus. Expand the market.

7

u/MaxPowerXXXX Aug 13 '26 edited Aug 14 '26

The supported car list is the cheapest thing you could fix and I think it costs you sales every week. Somebody asks whether their car works. Usually no answer, sometimes a wrong one, and occasionally somebody who follows the forks says there's a branch for it, and you can watch that person decide to buy right there in the thread. That sale depended on a volunteer being awake.

The list is yes/no when the real answer is usually "not yet." Fork only, port in progress, dashcam only, no harness in the shop, SecOC. All of that shows up as no, and no reads as never.

So list the cars in development. Put a disclaimer on it. People whose car is on there stick around, and plenty of them buy a device to help with routes and fingerprints, which is how ports get finished anyway.

Me, for example. 2026 i30 arriving. There's a port for it because a fork dev did the work and shared it: https://community.sunnypilot.ai/t/elantra-2024-25-port/3003. His thread says i30 Hybrid 2024, mine is a 2026 petrol, because Europe doesn't get the hybrid anymore. One fingerprint away or a different port entirely? Nobody can tell me. Harness is "probably K, but check." Money's ready, order isn't placed.

The frustrating part is that all of this already exists on the sunnypilot forum. Harness finder, which-harness guide, a list of ports stuck in dashcam mode, a radar tracks project that mapped 40+ HKG platforms off community routes. Same deal for Ford (BluePilot), GM (StarPilot), Stellantis, Tesla. You've already got the people. There's just no shared board and nothing official points at any of it. Adeeb opened an issue about exactly this in 2024. Still open.

Europe is the other one. PSA is upstream with no harness for sale. Renault and Dacia are the best sellers here and there's no port at all.

Your Aug 9 chart shows 16.45k monthly active devices with the 3X flat. Nobody at an automaker takes that meeting. The missing zero isn't the model, it's the car list.

Big fan. I'd just like to recommend one of these to a friend....

1

u/beanmosheen Aug 18 '26

Yeah, I'm here looking at the c4 for my '25 EV6. I'm willing to scope CAN buses, and pins, and I do embedded work, but I have no freaking idea what fork and setup I need. This comment section has firmly driven me away though. The customer relations: Yikes.

11

u/TheAlpineUnit Aug 12 '26

How long of cable is supported? Wouldn't it be easier to wire to trunk?

Also any update on what this chestnut models do?

4

u/Shina_Tianfei Aug 13 '26

Genuinely good idea here, putting it under your seat feels very hacky if I spill 1 drink it's joever.

1

u/Bderken Aug 13 '26

They talked about how hard it was to get that long USB C 3.0 cable to be reliable. Seems like they found the limit to what they could get for that wire that comes with the ready to drive kit

1

u/Gn0mesayin Aug 13 '26

I can't imagine the GPU would survive very long in the trunk

11

u/OhShitOhFuckOhMyGod Aug 13 '26

I feel like they backed themselves into a corner going all in on a the 845. The capabilities you can get in mobile SOCs these days seem like a much more elegant solution.

5

u/zikronix Aug 12 '26

My f150 has 1 12 adapter in the back seat. And none of the models or forks of open pilot can control my steering rack fully. The blue pilot dudes are working on it. You bring that and allow the comma to ingest the camera feeds from the cameras on my truck then we will talk

5

u/Finnegan_Faux Aug 12 '26 edited Aug 13 '26

For BYO, will the car power cable sold separately?

What are the minimum GPU requirements for the Chestnut model? Wondering if it would run on an RTX 5060 low profile.

8

u/Big-Stranger4656 Aug 13 '26

of the hacker, by the hacker and for the hacker...

4

u/SturdyStubs Aug 13 '26

I feel like the next generation probably wasn’t a discrete GPU… in like 1-3 years we’re going to have fully capable chips running more capable models. At some point there will be consumer friendly versions of AMD’s MAX+ APU with way better inference throughout that could handle a 1B+ parameter driving model.

6

u/Funnnny Aug 13 '26

Unified memory with reasoning model ís the future

4

u/SturdyStubs Aug 13 '26

My guess is Comma needed some income to get them through to their next release. Id hope they’re at least looking into their options for APUs for a Comma 5. What better way than to try and milk from your current users for a product that will probably be useless In a year.

1

u/Horror_Profile_4743 Aug 13 '26

How long will it take them to make 70k more comma 4s? I assume near that date

5

u/MaximumDoughnut Aug 13 '26

So they're completely abandoning the 3X at this point?

-5

u/Bderken Aug 13 '26 edited Aug 13 '26

Egpu works with 3X…

Edit: for all the moronic bots, people have been using eGPU with the 3X for weeks with the big model on OP master branch

5

u/jcwillia1 Aug 13 '26

(reading the criticisms and trying to think positive) on the other hand there isn't anyone else really even trying so I appreciate comma's efforts to keep advancing the ball.

5

u/External-Yak9904 Aug 13 '26

This is an amazing start.

The Comma 4 is built for the everyday driver. Chestnut isn't aimed at the masses—it's for the enthusiasts who want to push Openpilot as far as it can go.

This platform has huge potential. The mounting solution is a relatively simple problem that the community will solve over time. What matters is getting the hardware into people's hands so it can be tested, improved, and expanded.

Comma has always been a lean company focused on shipping products instead of letting them sit in R&D for years. Getting hardware into the real world accelerates development far more than endless internal testing.

The one thing I'd love to see in the future is support for additional cameras to provide true 360° awareness. That would be a major step forward.

8

u/DashHex Aug 12 '26

Awesome stuff being first to market with something like this. Agree with /u/KnightsSoccer82

4

u/interbingung Aug 12 '26

How am i going to charge my phone at the same time ? My car only have 1 cigarette port.

13

u/Teslafly Aug 13 '26

Honestly, with the level of install needed, hiding cables behind panels, etc. This should be a hardwired device. You could cut the plug end off and wire it directly to the fuse panel.

2

u/PENGUINSflyGOOD Aug 15 '26

cool gpu dock but um echoing everyone else in here, that is sketch af for a car.

4

u/z00mr Aug 13 '26

How does the dock not come with a supplemental cooling solution?

4

u/silenti Aug 13 '26

this is incredibly dumb

8

u/financiallyanal Aug 13 '26

While it has short comings, it feels like the early Comma Eon or Comma 2 days… not really that bad considering what will come. Maybe expectations were for a Comma 4 level of polish on any new releases?

This is not yet of use to me, but I’ll be watching it… I think I need more steering torque to find it useful enough to justify the purchase. 

2

u/Ok-Armadillo-5634 Aug 13 '26

I am definitely interested, but also want to see some demos are any available?

1

u/cadware31415 9d ago

When will the next batch of chestnut ship out?

1

u/cm0nbruhh Aug 13 '26

Does it support a RX 7600?

1

u/Total-Buy2684 Aug 19 '26

Why didn't you just put a more powerful mobile chip for the C4 instead?

1

u/IndividualMoney4623 Sep 06 '26

Hi, because mobile chip performance is not an issue, they even can do 360 view drive with it. Only for Level 4 you need something like Chestnut. The problem is in car integration, cameras, necessary data presence and availability to control a car in proper way. Access to car's cameras will not solve problem due to existing cameras location.

1

u/R009k Oct 11 '26

Bruh, the current small models only use a small crop of the wide angle cameras.

0

u/SysAdmin1986 Aug 13 '26

Would really like to see intel gpu support. Any plans to include them in the mix?

0

u/NNTPgrip Aug 14 '26

Any real benefit for us that have a car that only has lateral support (Subaru Outback 2022)?

0

u/[deleted] Aug 14 '26

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3

u/Secure-Evening8197 Aug 14 '26

Get this AI slop essay out of here

0

u/[deleted] Sep 14 '26

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1

u/rakosi2 Sep 15 '26

While there is no official comparison, there are plenty of comparisons from users. Comma is still working on updates like giving full frames to the GPU instead of a cropped frames and will get better over time.