Elon Musk said on X that Anthropic’s Claude Opus 5.5 would be “not as good” as Grok 4.8, whose pretraining has now been completed. According to him, xAI is rewriting its software stack in C and C++ before a limited rollout of Grok 4.8 to Bot users later this week. Musk nevertheless predicted that Grok 5 could surpass Opus 5.5 in two or three months, without providing a firm release date or comparative scores. Anthropic reported that Opus 5.5 scored 66.4% on Terminal-Bench 4.0, compared with 57.9% for OpenAI’s GPT-6 Astra, while Musk has not published any results for Grok 4.8.
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