xAI Debuts Grok 4.5 With 1.5T-Parameter MoE

xAI has released Grok 4.5, built on a 1.5-trillion-parameter mixture-of-experts architecture with a 500K token context window. The model offers native real-time access to the web and X, strong reasoning and coding, and highly competitive pricing at $2 input and $6 output per million tokens, positioning it as a value leader among frontier closed models.