Grok 4.5 is now officially live on Cursor. With a 256k ultra-long context paired with Agentic Coding mode, the goal is to tackle complex programming tasks that require extended runtime. Musk claims its performance rivals Claude 3 Opus, but it's faster and more cost-effective. BridgeBench testing is currently underway, and if it can maintain Opus-level logical quality on production environment code, Cursor's development experience will undergo a transformative upgrade.