Elon Musk-run xAI had introduced the Grok 4 Fast model. The company announced the launch in a post on X (formerly Twitter), and said, “Grok 4 Fast, a multimodal reasoning model with a 2M context window that sets a new standard for cost-efficient intelligence. Available for free on grok.com, grok.x.com, iOS and Android apps, and OpenRouter.” The model is said to offer smarter performance, combining high efficiency with strong reasoning capabilities for various tasks. Grok 4 Fast features web and X search capabilities with 2 million token context window, and has a unified architecture that blends reasoning and non-reasoning modes in one model. In a blog post, xAI said, "Grok 4 Fast was trained end-to-end with tool-use reinforcement learning (RL). It excels at deciding when to invoke tools like code execution or web browsing." Grok New Feature Update: Elon Musk-Run xAI Introduces ‘Read Aloud’ Feature With Natural Human-Like Voice.

Grok 4 Fast AI Model

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