What to know

  • Anthropic released Opus 4.5 on 24 November 2025 as its newest flagship Claude model.
  • The model surpasses 80% on the SWE-Bench Verified benchmark, marking a major leap in coding reliability.
  • New integrations bring Claude directly into Chrome for browser automation and into Excel for data and formula tasks.
  • Opus 4.5 improves long-context handling, tool use and introduces an “effort” parameter for deeper reasoning.

Anthropic’s release of Opus 4.5 signals a sharp shift toward AI that operates not just as a conversational assistant but as a hands-on agent embedded in tools you already use. The model arrives with stronger reasoning, expanded context capacity and more consistent multi-step execution, making it suited for real-world, high-complexity tasks. Its performance milestone on the SWE-Bench Verified benchmark highlights a reliability level that marks a practical step closer to autonomous coding support.

What makes Opus 4.5 stand out in the news is its tight integration with Chrome and Excel. By placing Claude directly inside your browser, Anthropic is positioning the model to navigate websites, fill forms, summarise pages, automate repetitive steps and support research flows without switching tabs. In Excel, Claude transforms into a spreadsheet-aware assistant capable of generating formulas, creating models, analysing trends and supporting data work where accuracy and structure matter.

These integrations matter because they move AI from being an external helper into becoming part of your daily workflow. Instead of manually juggling inputs, you can rely on Opus 4.5 to plan steps, execute them and refine results within the tools where the work happens. The model’s expanded long-context strengths mean it can follow lengthy instructions, maintain coherence across large files and handle sustained multi-stage tasks that previously required manual oversight.

This release is also making headlines because of Anthropic’s focus on agentic capability. Opus 4.5 is designed not only to answer questions but to interact with tools, coordinate processes and use structured reasoning to reach goals. The introduction of the “effort” parameter allows you to choose between quick responses and deeper, more deliberate analysis—bringing flexibility for everything from rapid drafting to detailed debugging or financial modelling.