AI has fundamentally changed how people work with Excel. In 2026, you can describe what you want in plain English and get working formulas, VBA macros, data cleaning scripts, and full analysis workflows generated in seconds. But not all AI tools are equal — each has different strengths, weaknesses, and pricing.
I have tested every major AI tool with real Excel tasks — formula writing, data analysis, macro generation, debugging, and automation. This guide ranks the 7 best options based on practical testing, not marketing claims. For a deeper head-to-head comparison, see my detailed ChatGPT vs Claude vs Copilot vs Gemini for Excel comparison.
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Learn moreHow I Tested These Tools
Each tool was tested on the same set of real-world Excel tasks:
- Formula writing — XLOOKUP, nested IFs, SUMIFS with multiple criteria, dynamic arrays, LAMBDA functions
- Data analysis — summarising sales data, finding trends, identifying outliers
- Macro generation — VBA scripts for formatting, data processing, and automation
- Debugging — fixing broken formulas, diagnosing #SPILL! errors, explaining unexpected results
- Explanation quality — how clearly the tool explains what the formula does and why
1. ChatGPT — Best for End-to-End Analysis
ChatGPT remains the most versatile AI tool for Excel work in 2026. Its Code Interpreter can open .xlsx files directly, run formulas, create charts, and return processed files — making it the only tool that can handle the complete analysis workflow without you needing to copy-paste anything.
Strengths
- File uploads — upload your Excel file and ChatGPT analyses it directly. No need to describe your data layout; it reads the actual spreadsheet.
- Code Interpreter — runs Python behind the scenes to process data, create visualisations, and return modified files.
- Formula writing — handles everything from basic VLOOKUP to complex nested XLOOKUP, dynamic arrays, and LAMBDA functions.
- VBA generation — produces clean, functional macros for most common automation tasks.
Limitations
- The free tier has limited Code Interpreter access. Full functionality requires a Plus or Team subscription.
- For very complex nested formulas, ChatGPT occasionally makes logical errors that are not immediately obvious. Always review AI-generated formulas before deploying them.
Best for: Users who want to upload files and get complete analysis back. The strongest choice for data analysis, chart creation, and end-to-end workflows.
Pricing: Free tier available. ChatGPT Plus for full features.
Detailed guide: How to Use ChatGPT to Write Excel Formulas (With Real Examples)
2. Claude — Best for Complex Formulas and Debugging
Claude by Anthropic is the strongest option for pure formula logic. When you need a deeply nested formula with multiple conditions, error handling, and precise array operations, Claude consistently produces more accurate results than any other tool I have tested.
Strengths
- Formula precision — Claude excels at complex nested formulas where small logical errors compound. It gets multi-criteria lookups, conditional aggregations, and array formulas right more often than competitors.
- Explanation quality — Claude provides the clearest step-by-step explanations of how formulas work. Excellent for learning.
- Debugging — give Claude a broken formula and your data description, and it will diagnose the issue accurately. See How to Fix Excel Formula Errors with Claude AI.
- VBA and macros — produces clean, well-commented VBA code. See How to Use Claude AI to Write Excel Macros.
Limitations
- Cannot open Excel files directly (no Code Interpreter equivalent). You need to describe your data or paste it as text.
- The free tier has usage limits. Claude Pro is needed for heavy use.
Best for: Users who need precise, complex formulas and clear explanations. The top choice for formula debugging and learning.
Pricing: Free tier available. Claude Pro for extended use.
Detailed guide: How to Use Claude AI to Write Excel Formulas Instantly
3. Microsoft Copilot — Best for In-App Automation
Microsoft Copilot is the only AI tool on this list that works directly inside Excel. It sits in the ribbon, reads your workbook, and can add formula columns, create charts, format data, and build summaries without leaving your spreadsheet.
Strengths
- In-app integration — no copy-pasting, no switching windows. Tell Copilot what you want and it modifies your workbook directly.
- Data context — because it reads your actual tables, it understands your column headers, data types, and structure without you needing to explain them.
- Chart and summary creation — ask for a chart or summary and Copilot creates it directly in your worksheet.
- Agent Mode — the latest addition chains multiple operations autonomously. See Agent Mode in Excel: What It Does, What It Can't.
Limitations
- Requires a Microsoft 365 Copilot subscription — the most expensive option on this list.
- Formula accuracy is inconsistent. Copilot sometimes generates formulas that look right but have subtle logic errors. Review before trusting.
- Only works with data formatted as Excel Tables. See Format Data for Copilot in Excel.
Best for: Power users who spend hours daily in Excel and want AI built directly into their workflow. Best combined with an external tool like ChatGPT or Claude for complex formula writing.
Pricing: Requires Microsoft 365 Copilot subscription.
Detailed guide: How to Set Up and Use Microsoft Copilot in Excel (2026)
4. Google Gemini — Best Free Option
Google Gemini is completely free and handles Excel formula generation surprisingly well. It is the strongest choice for users who want capable AI assistance without any subscription.
Strengths
- Completely free — no subscription needed for formula writing, explanation, and debugging.
- Strong formula generation — handles XLOOKUP, SUMIFS, dynamic arrays, and LAMBDA functions accurately.
- Google Sheets integration — if you use both Excel and Sheets, Gemini works natively with Google Sheets through Workspace.
- Multimodal — you can take a screenshot of your Excel data and ask Gemini to write a formula for it.
Limitations
- Cannot open .xlsx files directly for analysis (unlike ChatGPT Code Interpreter).
- For deeply complex nested formulas, it is slightly less reliable than Claude.
Best for: Budget-conscious users who want free AI formula help. Excellent for Google Sheets users who also work with Excel.
Pricing: Free.
Detailed guide: How to Use Google Gemini to Write Excel Formulas for Free
5. Google Gemma 4 — Best Free Local AI
Gemma 4 is Google's open-weight model that you can run locally for free using Ollama or LM Studio. It handles Excel formulas with surprising competence for a model running on your own hardware.
Strengths
- Completely free and private — runs on your machine. Your data never leaves your computer.
- No internet required — works offline once downloaded.
- Surprisingly capable — for standard formulas, Gemma 4 matches or beats paid AI models on many tasks.
Limitations
- Requires decent hardware (8GB+ RAM for the smaller model, 16GB+ for the full model).
- Weaker than Claude and ChatGPT on deeply complex nested formulas.
- No file upload or Code Interpreter capabilities.
Best for: Users who need privacy, work offline, or want free AI without any subscription or usage limits.
Pricing: Free and open-weight.
Detailed guides: Gemma 4 vs GPT-4o vs Llama 4 for Excel Formulas | Gemma 4 for Data Analysis
6. Excel's Built-In COPILOT Function
The COPILOT function in Excel is a new formula function that calls AI directly from a cell. You write =COPILOT("summarise this column") and it returns an AI-generated result in the cell.
Strengths
- Lives in formulas — no need to open a chat panel. AI results appear directly in cells.
- Dynamic — results update when source data changes, just like any other formula.
- Good for text tasks — summarising, categorising, extracting information from text columns.
Limitations
- Requires Microsoft 365 Copilot subscription.
- Results can be inconsistent — the same prompt may return slightly different results each time.
- Not suitable for precise numerical calculations — use traditional formulas for that.
Best for: Text processing tasks within spreadsheets — categorising feedback, extracting entities, summarising text columns.
Pricing: Requires Microsoft 365 Copilot subscription.
7. Python in Excel
Python in Excel lets you run Python code directly in Excel cells using the PY function. Combined with Copilot, you can ask AI to write Python code that runs inside your workbook for tasks Excel formulas cannot handle.
Strengths
- Handles complex analysis — statistical modelling, machine learning, advanced visualisation via Python libraries.
- Combined with Copilot — ask Copilot to write Python code that runs inside your worksheet. See Copilot in Excel With Python.
- No Python installation needed — runs in the cloud through Microsoft's infrastructure.
Limitations
- Requires internet connection (code runs in the cloud).
- Learning curve if you do not know Python.
- Limited library support compared to a full Python environment.
Best for: Advanced users who need statistical analysis, forecasting, or data science capabilities beyond what Excel formulas can provide.
Pricing: Included with Microsoft 365 (Python execution). Copilot assistance requires Copilot subscription.
Comparison Table
| Tool | Formula Writing | Data Analysis | In-App | File Upload | Price |
|---|---|---|---|---|---|
| ChatGPT | Excellent | Excellent | No | Yes | Free / Plus |
| Claude | Best | Good | No | No | Free / Pro |
| Copilot | Good | Good | Yes | N/A | Subscription |
| Gemini | Good | Good | No | No | Free |
| Gemma 4 | Solid | Limited | No | No | Free / Local |
| COPILOT Function | N/A | Text Only | Yes | N/A | Subscription |
| Python in Excel | N/A | Advanced | Yes | N/A | M365 / Copilot |
My Recommendation
After testing all these tools extensively, here is the combination I recommend for most Excel users in 2026:
- Claude or ChatGPT for writing and debugging complex formulas. Claude for precision, ChatGPT for file-based analysis. Both are excellent.
- Microsoft Copilot for in-app automation if your organisation already has the subscription. It saves significant time on repetitive formatting, charting, and summary tasks.
- Google Gemini as your free fallback for quick formula questions when you do not need a paid tool.
- Gemma 4 locally if you need privacy or work with sensitive data that cannot be sent to external AI services.
No single AI tool is the best at everything. The strongest workflow combines an external tool for complex formula writing with an in-app tool for everyday automation. And regardless of which tool you use, always review AI-generated formulas before relying on them.
Learn More
I write extensively about using AI with Excel. Here are the best starting points:
- 60 ready-to-use prompts: 60 AI Prompts for Excel That Actually Work
- Complete AI comparison: ChatGPT vs Claude vs Copilot vs Gemini for Excel in 2026
- Formula review checklist: How to Review AI-Generated Excel Formulas Before You Trust Them
- Getting started with Copilot: How to Set Up and Use Microsoft Copilot in Excel
Sources & Further Reading
Related Posts
- ChatGPT vs Claude vs Copilot vs Gemini for Excel in 2026
- 60 AI Prompts for Excel That Actually Work (Copy, Paste, Get Results)
- Agent Mode in Excel: What It Does, What It Can't, and Who Should Use It
- Gemma 4 vs GPT-4o vs Llama 4: Which Free AI Model Is Best for Excel?
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