Elon Musk said Grok 4.7 will take a few more days to launch, slipping past the timeline he gave on Sept. 2, when he said the model would be released in 10 days, pointing to roughly Sept. 12. As release approached, xAI found that the model was ending too early on difficult tasks. Musk said it would sometimes give up before finishing tasks it was otherwise capable of completing, and its answer-checking was not strict enough.
He said the issue may stem from the reinforcement learning stage. One possible explanation, according to Musk, is that training penalized response length too heavily, pushing the model toward shorter answers and earlier stopping. That, in turn, may have compressed the reasoning needed for harder tasks. Musk also framed that explanation cautiously, saying it was a possible cause or something similar, which indicates xAI has not fully confirmed the root cause yet.
Elon Musk said Grok 4.7 needs a few more days before launch, missing the timing implied by his Sept. 2 comment that it would be released in 10 days, or around Sept. 12.
xAI found the model was stopping too early
As the release neared, xAI found that Grok 4.7 was wrapping up too early on difficult tasks. Musk said the model would sometimes quit before completing tasks it was actually capable of finishing, and that its answer-checking was not rigorous enough.
Reinforcement learning is one suspected cause
Musk said the problem may trace back to the reinforcement learning stage. In his description, training may have penalized response length too heavily, pushing the model toward shorter outputs and faster stopping. That may also have compressed the reasoning time needed for more complex tasks.
He also qualified the explanation with language such as “possible” and “or something similar,” showing that xAI has not fully pinned down the root cause.
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