xAI Introduces Grok 4 Fast: A Cost-Effective, High-Performance AI Model

Elon Musk-backed xAI has launched Grok 4 Fast, an optimized version of its Grok 4 artificial intelligence system, aimed at delivering high performance at lower operational costs. The new model is built to cater to both enterprise and consumer applications, combining reasoning and non-reasoning capabilities within a single, unified framework. This integration reduces the need for separate models, cutting latency and simplifying deployment.

According to xAI, Grok 4 Fast consumes 40% fewer “thinking tokens” on average compared to its predecessor, without compromising accuracy. Independent analysis by Artificial Analysis confirmed a significant improvement in cost efficiency, estimating that Grok 4 Fast requires up to 98% less spending to achieve results comparable to Grok 4.

Benchmark results highlight the model’s strong capabilities. Grok 4 Fast scored 85.7% on the GPQA Diamond test, 92% on AIME 2025, and 93.3% on HMMT 2025, closely mirroring Grok 4’s performance. The model ...