Elon Musk said xAI’s Grok 4.8 would be “not as good” as Anthropic’s Claude Opus 5.5. He said Grok 4.8 had finished pretraining but was still undergoing reinforcement learning, and he expected a limited rollout to Bot users after a rewrite of xAI’s software stack. He did not publish Grok 4.8 scores that would show the size of the gap.
Musk predicted Grok 5 could surpass Opus 5.5 in two or three months, but gave no comparison scores or firm release date.
