Anthropic is raising the bar in AI competition once again.
The company on Monday announced Claude Opus 4.5, which it calls its most advanced AI model to date, just three months after its previous release.
Anthropic says the latest version includes significant improvements in the generation of computer code and workplace documents such as Excel spreadsheets and PowerPoint presentations. It also includes new features for creating more advanced, long-running AI agents.
“This is the most intelligent model in the world for the things we really care about,” Alex Albert, head of developer relations at Anthropic, told Business Insider.
Following recent updates to the Sonnet and Haiku models, this release completes the Claude 4.5 family. Opus models are built for advanced reasoning and complex problem solving, while Sonnet and Haiku are optimized for speed and efficiency. This also comes a week after Google announced its Gemini 3 model.
Anthropic’s Claude model is primarily designed for business users. Anthropic currently leads in enterprise AI adoption, capturing 32% of the market, according to a July report from Menlo Ventures. This is higher than OpenAI, which held 25% (about half of its share two years ago). Google followed with 20%, followed by Meta in fourth place with 9%. (Menlo Ventures is an investor in Anthropic).
Albert declined to make direct comparisons with competitors, but said Opus 4.5 is designed for “the most difficult tasks” and “the most intellectually demanding experiences.” For example, the model can now produce “expert-quality” spreadsheets 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, a popular coding evaluation test set.
“This theme is moving very fast right now and it’s about continuing to put out the best models possible,” Albert said.
Google did not respond to a request for comment from Business Insider about Gemini 3 Pro’s performance in SWE-Bench Verified compared to Opus.
Last week, Anthropic announced plans to spend $30 billion to secure access to Nvidia chips through Microsoft’s cloud platform. As part of the agreement, Nvidia has committed to investing up to $10 billion in Anthropic, and Microsoft has committed to investing up to $5 billion. The partnership has raised concerns that circular investments among AI companies could artificially inflate valuations.
Anthropic is in talks to raise new funding from Google, and Business Insider previously reported that the deal could value the company at $350 billion. This brings the company’s $138 billion valuation to more than double the $13 billion it raised in September.
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