September 15th, ElonMuskIts xA The company launched new members of its product matrix -Grok 4 Fast model. Currently, the model can be used by the user through a model selector at the Grok webend, with an additional switch to be enabled in the Subscription Settings, labelled as " Early access test version " (early access Beta)。
According to 1AI, the core strength of Grok 4 Fast is speed, with feedback from users indicating that it can respond 10 times as fast as the standard Grok 4. The main difference between the two is that Grok 4 Fast has been tailored to optimize rapid response by reducing processing time for complex missions. For example, if the model is given a command to generate robotic SVG images, the output results will be deliberately in the form of a simplified base, a design that fully reflects the core positioning of the model's “velocity over complexity”。
This design approach is very helpful to users who seek immediate results, and a high-speed response from Grok 4 Fast can significantly increase efficiency. However, the limitations of the model are also evident in a given scenario: in order to guarantee the speed of response in the face of creative needs or tasks that need to be carefully addressed, the model compromises the depth of content and the richness of detail。
It is worth noting that Grok 4 Fast was not the first time that the model had been internally measured on the Arena platform under the name "Sonoma" test, indicating that XAI had completed low-key experiments and optimization for some time before the model was officially launched。
Grok 4 Fast is still in the “early access” phase, and may be open to free users in the future and may even replace the old Grok 3。
In addition, XAI has added a dedicated "update log" section to the Grok page to make the iterative progress of the product available in real time. It is known that Grok 4 Fast will be adapted for mobile end applications。