Grok 4.5 is a proprietary mixture-of-experts reasoning model positioned for coding, agent tasks, and general knowledge work rather than narrow chat. According to DataCamp, Cursor reports that SpaceXAI co-trained the model on trillions of tokens drawn from developer and agent interactions, which shapes its emphasis on multi-step tool use and long task chains rather than single-turn conversation. The same source describes it as SpaceXAI's MoE reasoning model in production, with the consumer Grok assistant and the Grok Build coding environment both defaulting to it.</paragraph-content-not-here>

On real-world professional work, Grok 4.5 showed its strongest case in Snorkel's independent evaluation. Snorkel ran the model on a roughly the listed price,000-task sample of the GDPval+ dataset of expert-authored workplace deliverables, and reported that Grok 4.5 delivered the strongest overall performance against GPT 5.5 and Claude Opus 4.8 on that benchmark. For practitioners, that signal matters most when tasks look like end-to-end professional work, such as producing documents, spreadsheets, and presentations, where reasoning, tool calling, and structured output converge. The combination of MoE capacity, agent-flavored training data, and a top placement on a grounded expert-built evaluation suggests Grok 4.5 is best suited to users who want a reasoning-first model for coding assistants and office workflows rather than lightweight chat.