Anthropic launched Claude Opus 4.8 this week, and Artificial Analysis reports that it narrowly tops the independent Artificial Analysis Intelligence Index at 61.4, compared with 60.2 for GPT-5.5 (xhigh). In Anthropic’s announcement for the model, Opus 4.8 looks mostly like an incremental upgrade over 4.7, but the company noted that its heavily-promoted Mythos model would…
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