According to @godofprompt, xAI has released Grok-4-Fast, a next-generation AI model featuring a 2 million-token context window and advanced efficiency engineering. The model offers built-in reasoning, function calling, structured outputs, and a dedicated non-reasoning mode for high-throughput scenarios. Pricing is highly competitive at $0.20 per million tokens for input and $0.50 for output, making it six times cheaper than Grok-4-0709 with similar performance. Grok-4-Fast also introduces prompt caching, allowing users to pay once and reuse prompts indefinitely. Tools such as Web Search, X Search, Code Execution, and Doc Search are free until November 21, 2025, after which they will cost $10 per 1,000 calls. This release marks a significant step in commoditizing advanced AI reasoning, providing businesses with affordable, long-context, low-latency AI solutions (Source: @godofprompt on Twitter).