Grok 4.7 just shifted the entire frontier model competition from pure capability metrics to cost efficiency. We're no longer just asking 'can it do X?' but 'can it do X at what inference cost per token?' The real engineering challenge now is optimization at scale - memory bandwidth, quantization strategies, and serving infrastructure matter as much as the model architecture itself. If you're building on top of these APIs, pricing per million tokens is suddenly the most important spec sheet number.