5d • General discussion
xAI has released Grok 4 Fast, featuring a 2M token context window and a 98% cost reduction.
A recent advancement in xAI's Grok 4 model has introduced a high-efficiency variant, which is designed to deliver extensive context handling and superior reasoning capabilities at a significantly reduced cost. This development marks xAI's most substantial contribution to the enterprise foundation model market to date. The model's defining characteristic is its 2 million token context window, enabling the processing of entire codebases or extensive document collections within a single prompt. Additionally, it demonstrates enhanced efficiency, utilizing 40% fewer tokens than the original Grok 4 for complex logical operations. Industry analysis indicates that this model now leads in terms of price-to-intelligence ratio, offering competitiveness with leading models such as GPT-5 and Claude 4.1 Opus, while maintaining a considerably lower operational cost. During its launch, the model is available free of charge on platforms such as OpenRouter and Vercel AI Gateway. This release has the potential to significantly alter the economic landscape of large-scale agentic system development. For agencies, it renders previously cost-prohibitive automations commercially viable, enabling the provision of services such as "Full-Stack Codebase Analysis" and the development of "Deep Document RAG" systems for legal or financial clients. The model's capacity to ingest hundreds of documents simultaneously facilitates comprehensive responses without incurring high costs. Grok 4 Fast represents a significant disruption in the price-performance dynamics of frontier models, offering builders a tool with both extensive scale and exceptionally low operational costs.
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xAI has released Grok 4 Fast, featuring a 2M token context window and a 98% cost reduction.
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