In a post on X, Elon Musk (@elonmusk) says Grok 4.8 is a 2.5T model trained with a new C++ software stack. He says its training will finish this week, after which the model will start RL. The post does not explain what “RL” refers to in this training plan.
What Musk’s post says about Grok 4.8
The post provides four details:
Grok 4.8 is described as a 2.5T model.
It was trained with a new C++ software stack.
Its training is expected to finish this week.
It is then expected to start RL.
The post does not say whether training has since finished.
What the 2.5T size and C++ stack mean here
The post gives a reported size for Grok 4.8 and identifies the software stack used during training. It does not say whether 2.5T refers to the number of parameters or another measure of model size. It also does not provide technical details about the C++ stack or describe how the stack affects training.
Those details do not establish how Grok 4.8 will perform. The post includes no benchmark results, capability descriptions or comparison with earlier models.
What happens after training, according to the post
Musk says Grok 4.8 will start RL after its current training phase. The post does not define what “RL” means in this particular plan, so it does not establish the methods, objectives or duration of that stage.
It also does not say when that stage will end or whether it will be followed by a public release.
What remains unknown about Grok 4.8
The supplied post does not establish:
Grok 4.8’s capabilities or benchmark performance
A launch date or availability
How the new C++ software stack is designed or used
What “RL” means in this training plan
Whether the reported 2.5T size has been independently verified
For now, the update is a narrowly scoped description of Grok 4.8’s reported size, training software and expected next training phase—not a capability announcement or release confirmation.
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