Grok 4 Fast
Pushing the frontier of cost-efficient intelligence
Grok 4 Fast launched on September 21, 2025 with 358 votes, #67 of 8,160 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Grok 4 Fast is xAI's multimodal reasoning model designed for cost-efficient intelligence. It features a 2 million token context window and delivers strong price-to-performance metrics. The tool is available free in the Grok app, making it accessible for users seeking advanced AI capabilities without additional expense. It handles multiple types of input and is suited for productivity and intelligence tasks.
written from the facts on this page · September 2026
From the sources
Grok 4 Fast is xAI's latest multimodal reasoning model, setting a new standard for cost-efficient intelligence. With a 2M token context window, it achieves a SOTA price-to-performance ratio. It's now available for free in the Grok app.
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