Anthropic unveils new Claude Opus 4.5, its ‘most intelligent’ model

• Anthropic launched Claude Opus 4.5, calling it its most advanced and intelligent AI model to date.
• Claude Opus 4.5 excels at generating code, spreadsheets, and workplace documents for users.
• Anthropic is seeking new funding from Google, potentially raising its valuation to $350 billion.

Anthropic is once again raising the bar in the AI race.

On Monday, the company unveiled Claude Opus 4.5, which it calls its most advanced AI model yet, just three months after its previous release.

Anthropic says the latest version delivers major improvements in generating computer code and workplace documents, such as Excel spreadsheets and PowerPoint presentations. It also includes new capabilities for creating more sophisticated, long-running AI agents.

"It's the most intelligent model in the world for the things that we really care about," Alex Albert, Anthropic's head of developer relations, told Business Insider.

The launch completes the Claude 4.5 family, following recent updates to the Sonnet and Haiku models. Opus models are built for advanced reasoning and complex problem-solving, while Sonnet and Haiku are optimized for speed and efficiency. It also comes a week after Google debuted its Gemini 3 model.

Anthropic's Claude models are primarily designed for business users. A July report from Menlo Ventures found that Anthropic now leads in enterprise AI adoption, capturing 32% of the market. That puts it ahead of OpenAI, which holds 25%—about half of its share from two years ago. Google followed with 20%, and Meta came in fourth at 9%. (Menlo Ventures is an investor in Anthropic).

While Albert declined to make direct comparisons to competitors, he said Opus 4.5 was designed for the "hardest tasks" and the "most intelligence-demanding experiences." The model, for instance, can now generate spreadsheets of "expert human-level quality" similar to those used by financial analysts, he said.

Anthropic said the new model scored higher than Google Gemini 3 Pro and OpenAI's GPT 5.1 on SWE-Bench Verified, the popular coding evaluation test set.

"The theme is operating at a very high velocity right now and continuing to put out the best models we can," Albert said.

Google did not respond to a request for comment from Business Insider on the performance of Gemini 3 Pro on SWE-Bench Verified compared to Opus.

Last week, Anthropic unveiled plans to spend $30 billion to secure access to Nvidia chips through Microsoft's cloud platform. As part of the arrangement, Nvidia committed up to $10 billion in investments in Anthropic, while Microsoft pledged as much as $5 billion. The deal has fueled concerns about circular investments among AI companies that could artificially inflate valuations.

Anthropic is in talks to raise new funding from Google, a deal that could value the company at $350 billion, Business Insider previously reported. That would more than double its $138 billion valuation from September, when it raised $13 billion.

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