Dario Amodei, co-founder and CEO of artificial intelligence startup Anthropic.
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Anthropic on Monday announced Claude Opus 4.5, its latest artificial intelligence model that the startup says excels at coding, using computers and assisting users with complex enterprise tasks.
Claude Opus 4.5 marks Anthropic’s third major model launch in two months, and it serves as the latest example of the nonstop pace of development within the AI industry. The startup unveiled its Claude Sonnet 4.5 model in late September, followed by its Claude Haiku 4.5 model in October.
“The amount that we’re releasing to the market and the feedback loops that we’re generating from it just make me so unbelievably excited,” Scott White, product leader for Claude.ai at Anthropic, told CNBC in an interview.
Anthropic is an AI startup that was founded by a group of former OpenAI researchers and executives in 2021. Microsoft and Nvidia announced multi-billion-dollar investments in Anthropic last week, boosting the AI lab’s valuation to about $350 billion.
The company is best known for developing a family of AI models called Claude. It assigns new numbers to the models as they advance across generations, but the largest model in the family is typically called Opus, the midsized model is called Sonnet and the smallest model is Haiku.
The last Opus model, which Anthropic released in August, was called Claude Opus 4.1.
The ideal users for Claude Opus 4.5 will be professional software developers and knowledge workers like financial analysts, consultants and accountants, White said. People who are “excited to push their own creativity, build new things, expand their professional purview” will also find the model useful, White added.
The new model is “meaningfully better” at everyday tasks like working with spreadsheets and slides and conducting deep research, Anthropic said in a blog.
Claude Opus 4.5 is also state-of-the-art for agentic coding, outperforming rival models like Google’s Gemini 3 Pro, which was announced last week, and OpenAI’s GPT-5.1, according to SWE-bench Verified, a test set that measures an AI system’s software coding abilities.
Anthropic said it tested Claude Opus 4.5 on a difficult take-home exam that it gives to prospective performance engineers, and the model scored higher than any human candidate ever had.
Claude Opus 4.5 will be available everywhere, and it will be the default model for Anthropic’s Pro, Max and Enterprise offerings.
In addition to the model launch, Anthropic announced several other product and feature updates on Monday.
Claude for Chrome, the startup’s extension that allows Claude to take action across browser tabs, is expanding to all Max users, the company said. Claude for Excel, which can understand and edit spreadsheets, is now generally available to all Max, Team and Enterprise users.
Anthropic is also bringing Claude Code to its desktop app and adding new capabilities to its developer platform.
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