Anthropic’s Opus 4.5 model is here to conquer Microsoft Excel

Hot on the heels of Google’s Gemini 3 Pro release, Anthropic has announced an update for its flagship Opus model. Now at version 4.5, the new system offers state-of-the-art performance in coding, computer use and office tasks. No surprise there, those have been some of Claude’s greatest strengths for a while. The good news is Anthropic is rolling out a handful of existing tools more broadly alongside Opus 4.5. It’s also releasing one new feature.

To start, the company’s Chrome extension, Claude for Chrome, is now available to all Max users. Anthropic is also introducing a feature called infinite chat. Provided you pay to use Claude, the chatbot won’t fall to context window errors, allowing it to maintain consistency across files and chats. According to Anthropic, infinite chat was one of the most requested features from its users. Then there’s Claude for Excel, which brings the chatbot to a sidebar inside of Microsoft’s app. The tool is now broadly available to all Max, Team and Enterprise users, with support for pivot tables, charts and file uploads built-in.

On the subject of Excel, Anthropic says early testers saw a 20 percent accuracy improvement on their internal evaluations and a 15 percent improvement in efficiency gains. As a complete Excel noob, I’m excited to for the company to trickle down that expertise to its more consumer-oriented models, Claude Sonnet and Haiku.

Elsewhere, Opus 4.5 also delivers improvements in agentic workflows, with the new model excelling at refining its own processes. More importantly, Anthropic is calling Opus 4.5 its safest model yet. It’s better at rejecting prompt injection style attacks, outpacing even Gemini 3 Pro, according to Anthropic’s own evaluations.

If you want to try Opus 4.5 for yourself, it’s available today through all of Anthropic’s apps and the company’s API. For developers, pricing for the new model starts at $5 per million tokens.