Grok 4 Fast: Elon Musk-Run xAI Launches Multimodal AI Model With 2 Million Token Context Window, Available on Web, iOS and Android

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

Introducing 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 https://t.co/AnXpIEOhOD, https://t.co/53pltypvkw, iOS and Android apps, and OpenRouter.https://t.co/3YZ1yVwueV

— xAI (@xai) September 19, 2025

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(The above story first appeared on LatestLY on Sep 20, 2025 05:57 PM IST. For more news and updates on politics, world, sports, entertainment and lifestyle, log on to our website latestly.com).