AI startup Anthropic released “Claude for Excel” on Monday, a new tool that challenges its partner and rival, Microsoft, inside the world’s most popular spreadsheet software. It places Anthropic’s AI assistant directly into Excel to automate complex financial tasks for professionals.
The move targets the high-stakes finance industry with specialized agent skills and live market data from providers like LSEG and Moody’s. As a direct competitor to Microsoft’s own Copilot features, this launch heats up the battle for control of enterprise AI by meeting finance workers inside the program they use daily.
In a move that pits it directly against its most important partner, Anthropic has launched its AI assistant as an add-in that lives in an Excel sidebar.
From there, it can read, analyze, modify, and create new workbooks using natural language prompts. Crucially, the tool is designed for the high-stakes world of finance. It provides cell-level citations and explanations for every change it makes, preserving the complex web of formulas that underpin financial models.
We’re expanding Claude for Financial Services, with an Excel add-in, new connectors to real-time data and market analytics, and pre-built Agent Skills, including cash flow models and initiating coverage reports. pic.twitter.com/KfpD0losgr
— Anthropic (@AnthropicAI) October 27, 2025
A fascinating competitive dynamic is created by this launch. Microsoft has spent the last year aggressively embedding its own AI, Copilot, into its flagship productivity suite. Its efforts started with the in-cell `=COPILOT()` function in August and culminated in ‘Agent Mode’ for Excel just last month, which uses OpenAI’s GPT-5 to execute complex, multi-step tasks from a single prompt.
Now, Anthropic’s Claude is competing for the same screen real estate, offering a rival agentic experience inside Microsoft’s own application.
Its relationship with Microsoft is complex because the Redmond giant is also a key partner. Microsoft officially integrated Claude as a user-selectable alternative to OpenAI for certain M365 Copilot features in September.
While Microsoft’s in-app Agent Mode relies on OpenAI, its chat-based Office Agent for creating new documents from scratch is powered by Anthropic. This dual strategy of partnership and competition is now playing out directly within the cells and columns of Excel.
For now, Claude for Excel is available as a beta research preview for users on Anthropic’s paid Max, Team, and Enterprise plans.
Excel Becomes the New AI Battleground
By embedding its AI within the lingua franca of finance, Anthropic is making a strategic play for the lucrative enterprise market. The company isn’t just offering a generic assistant; it’s building a specialized tool designed to win over Wall Street.
A key part of this strategy is creating a competitive “data moat” by connecting Claude to the proprietary information that powers the financial industry.
Its announcement includes new connectors to a roster of financial data giants. These include LSEG (the London Stock Exchange Group) for live market data, Moody’s for credit ratings and company research, Aiera for real-time earnings call transcripts, and Chronograph for private equity portfolio data.
Having direct access to high-quality, real-time information gives Claude an advantage over general-purpose models trained on public web data, a critical edge in a sector where accuracy is paramount.
Already, this focus on specialized data and tooling is winning over major financial institutions. According to a report from VentureBeat, early adopters are seeing massive productivity gains.
Peter Zaffino, CEO of AIG, reported that the tool has “compressed the timeline to review business by more than 5x in our early rollouts while simultaneously improving our data accuracy from 75% to over 90%.”
This specific datapoint, improving accuracy from 75% to over 90%, highlights the tangible business impact these tools can have.
Similarly, a spokesperson for RBC Capital Markets praised the partnership, stating, “Working with Anthropic goes beyond deploying another AI tool—it’s about partnering with a company that understands the complexity that financial services requires.”
A Data Moat Built on Wall Street’s Information Infrastructure
Financial analysts, long accustomed to manual data wrangling, are being offered a new class of tools that go far beyond simple formula generation.
Anthropic is packaging Claude’s capabilities into pre-built “Agent Skills” designed to automate the daily grind of junior and mid-level analysts.
These skills can build entire discounted cash flow (DCF) models, perform comparable company analysis, process due diligence documents from data rooms, and even draft initiating coverage reports from scratch.
Powering this agentic capability is what Anthropic calls a “private computer environment,” a secure space where Claude can write and execute code to perform analysis and generate ready-to-use files.
It represents a significant evolution in spreadsheet AI, moving from a passive assistant that answers questions to an active collaborator that performs complex, multi-step projects.
Beyond Formulas: The Rise of the Agentic Spreadsheet
Despite the impressive capabilities, the financial industry remains cautious. A risk of AI “hallunciations” or cascading errors is a significant concern for finance leaders.
Anthropic is keenly aware of these risks and emphasizes the importance of human oversight. Jonathan Pelosi, the company’s Global Head of Industry for Financial Services, stressed that “the platform… is not intended for autonomous financial decision-making or to provide stock recommendations that users follow blindly.”
The tool is designed to be a powerful assistant, not an autonomous decision-maker.
This reflects a broader industry sentiment of cautious optimism. Financial institutions are eager to harness AI’s productivity gains but are moving carefully to manage the associated risks.
As Ian Glasner, HSBC’s Group Head of Emerging Technology, recently commented, “As an industry, we are very well prepared to manage risk. Let’s not overcomplicate this. We just need to be focused on the business use case and the value associated.”
Anthropic is betting that by providing a transparent, auditable, and data-rich tool directly within Excel, it can build the trust required to make AI an indispensable part of the financial world.
