Elon Musk's AI venture, SpaceXAI (formerly known as xAI), has unveiled its latest artificial intelligence model, Grok 4.5, a direct competitor to OpenAI's GPT-5.6 and Anthropic's Claude Opus 4.7 models. SpaceXAI describes Grok 4.5 as its most advanced AI model to date, specifically designed for software development and AI agents, claiming it uses tokens twice as efficiently as other leading AI systems. The model has been trained on tens of thousands of NVIDIA GB300 GPUs, with an emphasis on improving training data quality. It is available through SpaceXAI's coding platform, Grok Build, and via an API key through the SpaceXAI Console, having been developed in collaboration with Cursor, an AI coding start-up that SpaceX acquired in a massive $60 billion all-stock deal in June. SpaceXAI has priced Grok 4.5 at $2 per million input tokens and $6 per million output tokens, making it a more affordable option compared to Anthropic's Opus 4.7, which costs $5 per million input tokens and $25 per million output tokens. The launch comes as OpenAI gears up to publicly launch its GPT-5.6 family of models after a brief delay due to US government national security reviews.