Grok 4.5

Grok 4.5 is xAI's July 2026 frontier release, aimed more squarely at software engineering and multi-step agentic work than the original Grok 4. Trained on data spanning coding, science, engineering, and mathematics, it offers a 500K token context window and reasoning that can be switched on or off per request, and xAI introduced it as its smartest model yet for coding, agentic tasks, and knowledge work. Its strengths center on sustained coding sessions and tool-driven execution, with function calling, structured outputs, and vision input rounding out the agentic toolkit. It fits code assistants, autonomous engineering workflows, and research agents that alternate between careful reasoning and fast tool calls within one long-running context.