xAI Launches Grok 4 Fast with 2M Token Context Window, Boosting AI Efficiency

Elon Musk's xAI unveiled Grok 4 Fast, a breakthrough AI model featuring a two-million token context window—the largest publicly available. The architecture integrates reasoning and non-reasoning modes, allowing developers to optimize computational costs without compromising performance.

Benchmarks show Grok 4 Fast achieves comparable results to competitors while using 40% fewer tokens, slashing inference costs by 98%. Independent evaluators at Artificial Analysis confirm it delivers the best price-to-intelligence ratio among open-access models.

The system autonomously decides when to leverage external resources like web browsing or code execution. Early tests demonstrate rapid analysis of multimedia content and real-time information synthesis across platforms including X (formerly Twitter).