After launching Claude Sonnet 4.5 in late September and Claude Haiku 4.5 in mid-October, Anthropic unveiled its newest frontier AI model on Monday: Claude Opus 4.5. This advanced model delivers state-of-the-art performance across various tasks, setting a new standard in coding, office productivity, and computer use. One highlight is the new Infinite Chat feature for paid subscribers, which addresses common complaints about context window limitations by enabling the AI to leverage memory for maintaining context and consistency across files.
Claude Opus 4.5 also excels at creating diverse file types, including documents, spreadsheets, and presentations, with consistent quality, professional polish, and domain-specific awareness. It supports intelligent agents capable of automating repetitive tasks through direct control of computers or browsers. The model achieves groundbreaking results in production code, complex computer use, and sophisticated AI agents, such as the Claude for Chrome extension, which is accessible to Max subscribers. Remarkably, these agents are self-improving, achieving peak performance after just four iterations, whereas rival agents struggle to match this quality even after ten cycles.
The model introduces exciting features on the developer platform, including Claude Code on desktop in research preview. It demonstrates advanced reasoning abilities by handling ambiguous coding issues as a senior engineer would, even across multiple systems to debug and fix problems. Claude Opus 4.5’s performance also shines in complex enterprise tasks, excelling at multi-step reasoning that integrates information retrieval, tool use, and deep analysis.
Anthropic emphasized the model’s capabilities in Excel, positioning it as their best for spreadsheet creation and financial tasks like modeling and forecasting. Claude Opus 4.5 integrates with Excel via a sidebar chat that assists users in real-time on their files. This model sets a new benchmark for Excel automation and financial modeling, improving accuracy by 20%, efficiency by 15%, and making previously challenging tasks feasible. Claude for Excel supports advanced features including pivot tables, charts, and file uploads and is available to Max, Team, and Enterprise users.
Overall, Claude Opus 4.5 is a major leap forward in AI intelligence, efficiency, and practical application, bringing powerful enhancements to coding, office tasks, and autonomous agent workflows at a more accessible price point.
