Claude Opus 4.5 (November 1, 2025 version) is Anthropic's most advanced hybrid reasoning model, featuring breakthrough chain-of-thought capabilities. It excels in coding, content generation, data analysis, and planning, supports a 200K token context window (approximately 150K English words), and integrates image understanding and computer use functions, making it suitable for complex multi-step tasks and visual reasoning. Compared to previous models, it leads on graduate-level reasoning (GPQA) and undergraduate knowledge (MMLU) benchmarks, with 2x faster reasoning speed, making it the ideal choice for daily productivity and professional development.