xAI has officially launched Grok 4 Fast, a high-efficiency variant of its flagship Grok 4 model. Designed to deliver rapid responses without compromising core performance, Grok 4 Fast is built for users who prioritize speed, scalability, and cost-effectiveness in AI applications.
Unlike traditional setups that separate reasoning and non-reasoning tasks, Grok 4 Fast handles both within a single framework. This unified architecture reduces complexity for developers and streamlines deployment across platforms. It uses 40% fewer thinking tokens than Grok 4, yet maintains high accuracy—scoring 85.7% on GPQA Diamond, 92% on AIME 2025, and 93.3% on HMMT 2025.
One of the standout features of Grok 4 Fast is its pricing. At just $0.20 per million input tokens, it offers up to 98% cost savings compared to Grok 4. This makes it an attractive option for startups, researchers, and large-scale enterprises looking to scale AI usage without inflating budgets.
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Speed Without Sacrificing Utility
Grok 4 Fast is optimized for quick factual answers, simple code generation, and real-time interactions. It delivers responses up to 10x faster than Grok 4, making it ideal for chatbots, customer support, and productivity tools. While it may not match Grok 4’s depth in creative or complex reasoning tasks, its speed and efficiency make it a powerful tool for high-volume use cases.
Easy Access Across Platforms
Grok 4 Fast is now accessible via xAI’s website, mobile apps, OpenRouter, and Vercel AI Gateway. Some platforms are offering free access during launch, giving users a chance to test their capabilities before committing to full integration.
