xAI launches Grok 4 Fast in early access beta with up to 10x speed

xAI recently introduced Grok 4 Fast, a new addition to their lineup, now available for users on the Grok web interface via the model selector. This model can be accessed by enabling a new toggle in the Subscription settings, marked as early access beta. Grok 4 Fast is notable for its speed, with users reporting it is up to 10 times quicker than the standard Grok 4. The main difference is that this version is optimized to respond rapidly by spending minimal processing time on complex tasks. For example, if prompted to create a robot SVG, the output will be intentionally basic, reflecting the model’s priority on speed over sophistication.

This approach benefits users who value immediate results for straightforward queries or tool use, such as generating simple code, automations, or factual answers. The model’s limitations are most apparent in creative or highly nuanced requests, where depth and detail are sacrificed for prompt delivery. This trade-off aligns with broader trends in AI product strategy, where providers like xAI aim to segment their offerings by speed, accuracy, or creativity to cater to diverse use cases. The introduction of the Grok 4 Fast model follows previous tests under the name Sonoma on Arena, suggesting a period of quiet experimentation before broader release.

Currently, Grok 4 Fast is labelled as early access and is likely to be extended to free users, potentially replacing the ageing Grok 3. This would mark a substantial jump in capability and speed for users on the free tier, especially given the model’s improved reliability with tool integrations.

xAI has also rolled out a dedicated changelog section on the Grok web, providing transparency around ongoing updates, a move that fits the company’s pattern of iterative, user-informed development. As Grok 4 Fast is poised to reach mobile apps as well, its rapid and utility-driven approach could soon become the default experience for a wide segment of the user base.