xAI launches Grok 4 Fast with a 2M token context window

Elon Musk’s xAI has launched Grok 4 Fast its newest artificial intelligence model that boasts high-level reasoning at significantly lower ￰0￱ announced the launch of Grok 4 Fast in a blog post on Friday as its “latest advancement in cost-efficient reasoning models.” According to developers it uses frontier-level intelligence with accessibility to benefit both enterprise and consumer ￰1￱ model features a two-million token context window and introduces a unified architecture that integrates reasoning and non-reasoning ￰2￱ could help developers adjust the computational effort applied to their use cases without sacrificing performance. “2M context window!” CEO Elon Musk wrote on X

quoting the announcement for the new ￰3￱ 4 Fast has efficient tokens working on reduced prices xAI reported that Grok 4 Fast was trained end-to-end with reinforcement learning to autonomously decide when to use external resources such as code execution or web ￰4￱ tech company claimed it can move rapidly through links analyze multimedia on X and synthesize information in real ￰5￱ internal tests the system required 40% fewer tokens on average than Grok 4 to complete complex reasoning tasks

a 98% reduction in the cost of reaching comparable benchmark ￰6￱ density benchmark.