xAI Grok Imagine Image 2.0 — new image generation model with precise editing, Arena #2 ranking

xAI ships Grok Imagine Image 2.0 with precise editing capabilities and multi-reference input. Claims Arena #2 ranking. Part of xAI's expanding model portfolio. SpaceXAI branding and compute deal with Anthropic noted. This is a significant new model release in the image generation space, competing with DALL-E, Midjourney, etc. Track benchmark performance and ecosystem impact.