A user's full day impression of Grok 4.5 on Grok Build indicates it performs creative and task-driven work at Claude Opus quality, but is significantly faster and cheaper. The native integration of Grok API and X API for research and fact-checking within Grok Build eliminates additional costs. Grok 4.5 also performs as well as GPT 5.5 when integrated with a Hermes Agent, but with greater speed.