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121 xAI debuts a faster and more cost-effective version of Grok 4

Engadget
Jackson Chen @ Engadget · 09/20/2025 15:28 EDT

xAI debuts a faster and more cost-effective version of Grok 4

A few months after the release of Grok 4 and an extremely problematic antisemitic meltdown of its chatbot, xAI is already trying to move on with its latest AI model. Elon Musk's xAI announced the release of Grok 4 Fast, a faster, more efficient reasoning model compared to its recent predecessor. According to xAI, Grok 4 Fast offers similar performance to Grok 4 while using 40 percent fewer thinking tokens on average.
Along with faster results, xAI said Grok 4 Fast "results in a 98% reduction in price to ach

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