Posts
Elon Musk
@elonmusk · May 28, 2026
SpaceX has almost finished writing V1.0 of an in-house AI training stack in C that exact-maps to 220k GB300s with 800G NICs, making heavy use of pipeline parallelism and getting as close to bare metal as possible.
The potential speed improvement vs JAX for large training runs is
Elon Musk
@elonmusk · May 28, 2026
Next will be writing the inference stack in C for simultaneous high-speed RL across a large block of GB300s.
(We do use a little C++ tbh, but not much)
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Elon Musk
@elonmusk · May 28, 2026
Next will be writing the inference stack in C for simultaneous high-speed RL across a large block of GB300s.
(We do use a little C++ tbh, but not much)
Elon Musk
@elonmusk · May 28, 2026
Note, I am posted this to encourage those who enjoy getting incredible performance out of hardware to join SpaceX
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Elon Musk
@elonmusk · May 28, 2026
Grok Build improvements
skcd@skcd42· May 28, 2026Bug fixes shipping to Grok Build 0.2.7 (release notes will be available in the TUI)
• Wrap around on Up/Down in slash menu and history search
• Restore subagent UI and replay on session resume
• Fix Ctrl+Delete on windows
• Windows drag-and-drop screenshot images +
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John Carter
@martianwyrdlord · May 28, 2026
The official line was that Nowak was so badly wounded that he would have died no matter what the officers did.
That's a very convenient line.
Release the video, and release the identities of the officers.
Hampshire Police@HantsPolice· May 28, 2026Today, a man has been convicted of the murder of student Henry Nowak in Southampton. Throughout the trial, we have not discussed this case publicly to ensure that justice could be done but now we can share a message from DCC Robert France.
Elon Musk
@elonmusk · May 28, 2026
Yes
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Trans Nepo Baby
@SharkeyAli94062 · May 28, 2026
Fired. Suspended is not enough.
Fired, then prosecuted
Elon Musk
@elonmusk · May 28, 2026
Absolutely, since that is what happened in the George Floyd case!
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hardmaru
@hardmaru · May 27, 2026
For over a decade, we’ve accepted that end-to-end backprop is the only way to train deep networks. But holding the entire network in memory all at once is why AI training is hitting a resource wall.
We found a new way to break the network into blocks and train them
Sakana AI@SakanaAILabs· May 27, 2026Introducing DiffusionBlocks: Block-wise Neural Network Training via Diffusion Interpretation
What if we didn’t have to hold an entire neural network in memory to train it?
Standard neural net training optimizes all parameters jointly. As a result, the
Elon Musk
@elonmusk · May 28, 2026
Interesting
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the tiny corp
@__tinygrad__ · May 28, 2026
tinygrad will write that C for you. Our new driver compiles all interaction with the GPU to C, so once it's running the CPU does next to nothing.
Elon Musk@elonmusk· May 28, 2026SpaceX has almost finished writing V1.0 of an in-house AI training stack in C that exact-maps to 220k GB300s with 800G NICs, making heavy use of pipeline parallelism and getting as close to bare metal as possible.
The potential speed improvement vs JAX for large training runs is
Elon Musk
@elonmusk · May 28, 2026
Agreed, the CPU cores on the GB300 should be tasked with agentic jobs. Very little of their compute is needed for GPU management.
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DonaldBest.CA * DO NOT COMPLY
@DonaldBestCA · May 28, 2026
ust not be banned. Instead, all good citizens must have the right to possess and carry defensive weapons.
The police will not be there to protect you or your children.
Criminals will always be armed because they don't care about the law.
Only a good armed citizen can prot
Elon Musk
@elonmusk · May 28, 2026
Yes, allow the people to defend themselves
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Tim Pool
@Timcast · May 28, 2026
So tell me
Why has this not been stopped?
Why is this just going to keep happening?
New York Post@nypost· May 28, 2026Four stabbed by knifeman shouting 'Allahu Akbar' at Switzerland train station in front of terrified children
Elon Musk
@elonmusk · May 28, 2026
When is enough enough?
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Whole Mars Catalog
@wholemars · May 28, 2026
Pure C > C++
Modern C++ is an abomination
Elon Musk
@elonmusk · May 28, 2026
I agree
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Colin Wright
@SwipeWright · May 27, 2026
ANNOUNCEMENT: WE’RE SAVING SCIENCE!
We’re often told that science is “self-correcting.”
But that’s not really true.
Science doesn’t correct itself like a thermostat adjusting the temperature in your house. Science is a human institution run by human beings. And human beings
Elon Musk
@elonmusk · May 28, 2026
True
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MichaeloKeeffe
@Mick_O_Keeffe · May 28, 2026
🚨🇮🇪 BREAKING
Asylum seeker arrested after woman was murdered in Galway this morning.
The woman who was working at an IPAS centre, was stabbed multiple times in the neck.
Elon Musk
@elonmusk · May 28, 2026
!!
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Matthew Prince 🌥
@eastdakota · May 28, 2026
There’s a ton of headroom to better optimize AI training and inference.
Elon Musk@elonmusk· May 28, 2026SpaceX has almost finished writing V1.0 of an in-house AI training stack in C that exact-maps to 220k GB300s with 800G NICs, making heavy use of pipeline parallelism and getting as close to bare metal as possible.
The potential speed improvement vs JAX for large training runs is
Elon Musk
@elonmusk · May 28, 2026
Yes.
It’s not that we’ve discovered some magic bullet, but rather that JAX, or at least the open source version of it, is mostly optimized for small to medium-sized training runs on Google TPUs, whereas we need to massive training runs on Nvidia GPUs.
Pipeline parallelism is essential and crushes fully-sharded data parallelism at scale.
And C will compile to the most efficient binary short of assembly. Maybe we will do a little assembly too.
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maharshi
@maharshii · May 28, 2026
they made an in-house AI training stack from scratch in C as a hobby project
Elon Musk@elonmusk· May 28, 2026SpaceX has almost finished writing V1.0 of an in-house AI training stack in C that exact-maps to 220k GB300s with 800G NICs, making heavy use of pipeline parallelism and getting as close to bare metal as possible.
The potential speed improvement vs JAX for large training runs is
Elon Musk
@elonmusk · May 28, 2026
It’s essential or we simply cannot be competitive
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Robert Jenrick
@RobertJenrick · May 28, 2026
Sorry isn’t good enough.
We need to see the body-worn footage and these officers need to face consequences.
The treatment of this murdered student, in his dying moments, is a national scandal.
Elon Musk
@elonmusk · May 28, 2026
Absolutely
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Kazim Raza
@KazimAIZJU · May 28, 2026
Makes sense for shaving latency in tight RL loops. Curious how you handle memory safety in C without the C++ guardrails
Elon Musk
@elonmusk · May 28, 2026
With great {malloc} power comes great responsibility
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Claude
@claudeai · May 28, 2026
Introducing Claude Opus 4.8: it builds on Opus 4.7 with sharper judgment, more honesty about its own progress, and the ability to work independently for longer than its predecessors.
Available today at the same price.
Elon Musk
@elonmusk · May 28, 2026
Nice work
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Basil the Great
@BasilTheGreat · May 28, 2026
🚨BREAKING: HAMPSHIRE POLICE APOLOGISE FOR ARRESTING HENRY NOWAK AS HE DIED IN STREET
Robert France, temporary deputy chief constable for Hampshire Police has said he's "sorry" his officers arrested Henry in the moments before he died
NOT GOOD ENOUGH
They must pay for their
Elon Musk
@elonmusk · May 28, 2026
Not even close to good enough. Those officers committed a serious crime.
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ApoStructura
@ApoStructura · May 28, 2026
I love that SpaceX is becoming the classic tech megacorp from sci fi.
The only thing missing is a badass hq tower
Elon Musk@elonmusk· May 28, 2026SpaceX has almost finished writing V1.0 of an in-house AI training stack in C that exact-maps to 220k GB300s with 800G NICs, making heavy use of pipeline parallelism and getting as close to bare metal as possible.
The potential speed improvement vs JAX for large training runs is
Elon Musk
@elonmusk · May 28, 2026
We do kinda have that at Starbase
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Tommy Robinson 🇬🇧
@TRobinsonNewEra · May 28, 2026
So @HantsPolice laughed as Henry Nowak was dying, they took his and his dad's phones to search for "racism" in a sickening attempt to justify his murder!
Elon Musk
@elonmusk · May 28, 2026
Those hateful police are accessories to murder
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