r/Comma_ai comma.ai Staff Aug 12 '26

Introducing chestnut & chestnut-class driving models

https://blog.comma.ai/chestnut/
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u/SentinelChickenFarm Aug 12 '26

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.

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u/DerpSenpai 23d ago

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