Elon Musk-run xAI Grok Fast has 2 million token context window, which has surpassed other AI models from providers like Meta, Google, Anthropic, OpenAI, and more. Grok-4 Fast now offers a wider memory range for processing large volumes of text.  In comparison, Meta's Llama 4, Google’s Gemini 2.5 Pro, and Anthropic’s Claude 4 Sonnet each offer a 1 million token window. OpenAI’s GPT-5 supports 400,000 tokens. As per a post of (@cb_doge) shared on X (formerly Twitter) on September 28, 2025, and said, said, "Grok-4 Fast sets a new bar in AI with a 2,000,000 token context window, double the context window of Claude, Gemini, and Meta, and 5× that of ChatGPT." Will Elon Musk’s X Be Dropped by UK Government? Energy Minister Ed Miliband Calls Musk a ‘Dangerous Person’ and Accuses Him of ‘Inciting Violence’, Says Exit ‘Possible’: Report.

‘Grok-4 Fast Sets a New Bar in AI With a 2,000,000 Token Context Window’

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