SpaceXAI released Grok 4.6 for multi-step agents, coding, knowledge work, and interactive visual projects. It says the model matches GPT-5.6 Sol on the Artificial Analysis Intelligence Index and is live in Cursor, Grok Build, the SpaceXAI API, and partners such as OpenRouter, Vercel, and Cloudflare. Pricing starts at $2 per million input tokens and $6 per million output tokens, with a faster variant at twice that rate and double included usage in Cursor and Grok Build for week one. That matters as labs compete on agent endurance. The caveat is that several headline scores remain vendor-reported.