Best AI for Data Analysis: Which Chatbots Actually Compute on Your File

The best AI for data analysis is ChatGPT or Claude, because both run real code on your spreadsheet instead of reading it and guessing. OpenAI says ChatGPT writes and runs Python "in a stateful Jupyter notebook environment". Anthropic says Claude's code execution is available on every plan, Free included. For work that never leaves a spreadsheet, the better pick is the AI built into it: Copilot in Excel or Gemini in Sheets.

Most rankings of AI data analysis tools skip the one mechanic that decides whether you can trust the number. Does the chatbot compute over the whole file, or read part of it and summarise? This guide answers that for ChatGPT, Claude, Gemini, Microsoft Copilot and Perplexity, with the spreadsheet size caps and what each free plan actually includes. Every limit and price below comes from the vendor's own help centre or pricing page, checked on 26 October 2026.

The Key Takeaways

• Best overall: ChatGPT and Claude both run Python on your file, so they compute the answer rather than estimate it.
• Best free: Claude Free includes code execution, on by default. ChatGPT Free gets data analysis as "Limited" and only 3 file uploads a day.
• The size trap: ChatGPT caps spreadsheets at about 50MB, not 512MB. Claude caps files at 30MB once its code environment handles them, not 500MB.
• Inside a spreadsheet: Copilot in Excel comes with Microsoft 365 from $9.99 a month. Gemini in Sheets needs a paid Google AI or Workspace plan.
• Read the fine print: Perplexity says that from a long file it "will extract the most important parts", which is reading, not computing.

What Is the Best AI for Data Analysis?

The best AI for data analysis is the one that runs code on your data, and today that means ChatGPT or Claude. Both turn a question like which region grew fastest? into a short Python program, run it on every row, and show you the result. A chatbot that only reads the file can produce a fluent answer from the rows it happened to look at. That is the difference between a calculated number and a plausible one.

The right choice still depends on where your data lives and what you will pay. For a CSV or Excel file in a chat, ChatGPT is the strongest: it runs Python, draws charts and, on Plus, makes them interactive. The best free AI for data analysis is Claude, because code execution is included on the Free plan.

When the data already sits in a workbook, use the AI inside it. Copilot in Excel edits the workbook directly and comes with paid Microsoft 365 plans. Gemini in Sheets builds formulas, pivot tables and charts in a Google Sheet. For company databases, Claude Dashboards writes a SQL query for each chart against Snowflake, BigQuery and other warehouses.

Best AI for Data Analysis Compared

ChatGPT and Claude are the only two of the five chatbots whose help centres say they run code on the file you upload in a normal chat. The table sets out what each vendor documents, as of 26 October 2026.

File caps are the ceiling, not a promise. OpenAI notes that a spreadsheet can upload and still be "too large, complex, image-heavy, or poorly structured for complete analysis". Our guide to what each chatbot accepts on upload covers the limits for every other file type.

Does the AI Compute or Just Read Your Data?

An AI that computes runs code over every row and returns the exact result. An AI that reads takes in some or all of the text of your file and answers from that. Reading is fine for what columns does this file have? and unreliable for what is the average order value?, because a language model predicting a number is not the same as a program adding up 40,000 cells.

The Chatbots That Compute

ChatGPT and Claude both document code execution for data work. OpenAI's data analysis help page says ChatGPT "writes and runs Python code in a stateful Jupyter notebook environment" and can show pandas DataFrames as interactive tables. Anthropic's code execution help page says Claude has "a private computing environment" where it writes and runs code for data analysis, charts and even machine learning models.

Computing does not make ChatGPT or Claude infallible. The code can use the wrong column or a filter you didn't ask for. The advantage is that you can open the code and check it, which you cannot do with a number that simply appeared in a paragraph.

The Chatbots That Read

Perplexity is explicit that it reads. Its file uploads help page says short files are analyzed "in their entirety". From a long file, Perplexity "will extract the most important parts to provide the most relevant response to your query". That is a sensible design for a research paper and the wrong one for a sales export, where the skipped row could be the one that changes the total.

Gemini is the unclear case, and Google's own wording leans towards reading. Its help page for uploading files to the Gemini app describes making and editing charts from an uploaded spreadsheet but says nothing about running code on the file. Its usage guide says spreadsheets "require that Gemini reads large blocks of data to create a response". It also warns that with a large upload, Gemini "may provide a response that misses connections or details throughout the content". Until Google says the Gemini app computes on an uploaded spreadsheet, ask Gemini to show its working and check one number by hand.

ChatGPT for Data Analysis

ChatGPT is the most complete data analysis tool of the five for a file dropped into a chat. It accepts XLSX, XLS, CSV and TSV spreadsheets, runs Python on them, and returns tables, charts and the code it used.

What ChatGPT Does With Your Spreadsheet

OpenAI lists five jobs: summarising rows, columns, trends and outliers; building tables for row-by-row review; making charts; running Python calculations, transformations and statistical analysis; and explaining assumptions and next steps. Charts come out as images by default. Bar, line, pie and scatter charts can switch to an interactive view.

Two limits matter in practice. The Python environment "cannot make external web requests or API calls", so ChatGPT cannot pull live exchange rates into your analysis unless you upload them. And OpenAI warns that scanned PDFs and image-based tables may not give exact values, so export a real spreadsheet when the numbers matter.

ChatGPT Plans and File Limits

ChatGPT's pricing page marks data analysis as Limited on Free ($0) and included on Go ($8 a month), Plus ($20) and Pro (from $100). Interactive tables and charts start at Plus. Free accounts can upload 3 files a day, and paid accounts up to 80 files every 3 hours, which OpenAI may lower at peak times. Spreadsheets are capped at roughly 50MB "depending on the size of each row", well under the 512MB headline for documents. If you hit a wall mid-analysis, our explainer on how ChatGPT's message limits reset covers the rest of the caps.

Claude for Data Analysis

Claude is the best free AI for data analysis, because Anthropic includes code execution on the Free plan. The feature, called code execution and file creation, is on by default for Free, Pro and Max accounts, and its switch lives in Settings, Capabilities.

What Claude Does With Your Data

Claude processes CSV, TSV and Excel files with Python, draws charts as PNG images and can train simple machine learning models on your data. Its strength is what comes out the other end. Anthropic's examples include turning a CSV into a quarterly sales report as a Word document or PDF. Another turns the same CSV into an Excel model with working formulas, plus a PowerPoint deck to present it. Without a data warehouse, you can also build a Claude dashboard from an uploaded CSV.

The 30MB Claude File Limit

Claude accepts files up to 500MB in a chat, but the code environment it uses for data analysis caps files at 30MB "for both uploads and downloads". Excel files need that environment: Anthropic says you must turn on code execution to upload XLSX at all. In practice, plan for 30MB as Claude's working ceiling for spreadsheets. File work also uses up your plan's allowance faster than ordinary chat, by Anthropic's own account. Claude Pro costs $20 a month billed monthly, and Max starts at $100.

Gemini for Data Analysis

Gemini takes the largest spreadsheets of the five, up to 100MB per file and 10 files per prompt, and draws editable charts from them. How much of that file Gemini can hold at once depends on the plan. Google lists a context window of 32,000 tokens without an AI plan, 128,000 on AI Plus ($4.99 a month) and 1 million on AI Pro ($19.99) and Ultra. A large export can upload to the free app and still be far bigger than the free context window. If tokens are new to you, our explainer on what AI tokens are puts those numbers in pages.

Gemini's real data analysis strength is Google Sheets. Gemini in Sheets creates tables and formulas, generates "data analysis and insights", builds charts and pivot tables, and applies conditional formatting and filters inside the sheet. It needs an eligible Google AI or Workspace plan. Google says it works best on native Sheets files, so convert an Excel file with File, Save as Google Sheets first.

Microsoft Copilot for Data Analysis in Excel

Copilot in Excel is the best AI for data analysis when your data already lives in an Excel workbook. It works in three modes: edit mode changes the workbook directly, plan mode proposes the steps first, and chat mode keeps answers in the side panel. It builds formulas, charts and PivotTables, and it can run on Claude or GPT models.

Microsoft's individuals pricing page lists Copilot in the Excel desktop app with every paid consumer plan: Personal at $9.99 a month, Family at $12.99 and Premium at $19.99. Premium adds limited agentic AI for "advanced research and analytics" and the model switcher. Edits need Excel's Calculation Options set to Automatic. Our breakdown of every Copilot plan and what it costs sorts out the consumer and business tiers.

Perplexity for Data Analysis

Perplexity is a research tool first, and it is the weakest of the five for calculating over a file. Uploads to a search thread are capped at 40MB per file, every plan has a rolling weekly upload allowance that Perplexity does not display, and long files are summarised by extraction rather than read in full.

Where Perplexity earns a place is research around your data: market sizes, competitor prices or public statistics to set beside your own numbers. Its asset creation feature can also build an XLSX spreadsheet, a document or a deck from that research, and it is built for Pro, Education Pro, Max and Enterprise subscribers.

The Best Free AI for Data Analysis

Claude Free is the best free AI for data analysis, because it runs code on your file without a subscription. ChatGPT Free runs data analysis too, but OpenAI labels it "Limited", allows 3 file uploads a day and keeps interactive charts for Plus. Gemini's free app accepts 100MB files and draws charts, with rolling limits. Copilot in Excel and Gemini in Sheets both need a paid plan.

For a wider comparison of what each free tier allows beyond data work, see our ranking of the best free AI chatbots.

AI Inside Excel and Google Sheets

The best AI for spreadsheet analysis is often an add-in, because it edits the live workbook instead of a copy you uploaded. Copilot in Excel is built into paid Microsoft 365, and Gemini in Sheets is Google's own panel with a paid Google AI or Workspace plan. Two third-party sidebars reach further.

ChatGPT for Excel and Google Sheets is a sidebar available on Free, Go, Plus and Pro. It cleans messy sheets, traces broken formulas and runs scenarios. Our guide to the ChatGPT Excel add-in explains what it costs to use. Claude for Google Workspace puts a Claude sidebar in Docs, Sheets and Slides, in beta for Pro, Max, Team and Enterprise. It writes and fixes formulas and cleans data in place, with every change recorded in version history.

For company data that never lands in a spreadsheet, there is Claude Dashboards, in beta on paid Claude plans. It connects to warehouses such as Amazon Redshift, BigQuery, ClickHouse, Databricks and Snowflake, writes a SQL query for each chart and shows that query beside the chart. If you are new to working this way, our step-by-step guide to using AI in Excel to create and edit spreadsheets covers the basics.

Prompts That Make Any AI Compute Instead of Guess

The fastest way to catch a guessed number is to make the chatbot count before it answers. These four prompts work in ChatGPT, Claude and Gemini. Paste them after you upload the file.

1. Check that it read the whole file:

Before answering anything, load the whole file with code and tell me: the number of rows and columns, the column names and types, how many cells are empty in each column, and any duplicate rows. Do not estimate. If you cannot run code on this file, say so.

2. Answer with the method attached:

Using code, calculate [total revenue by region for 2026]. Show the code you ran, the exact filters you applied, and the result as a table. List every assumption you made that I did not state.

3. Find problems before analysing:

Check this data for problems before any analysis: mixed date formats, numbers stored as text, outliers more than three standard deviations from the mean, and totals that do not match their line items. Report what you find and ask me how to handle each one.

4. Verify one number by hand:

Pick the single most important number in your answer and recalculate it a second, different way. If the two results differ, explain why.

If a chatbot answers prompt 1 with a round row count it could not have computed, treat every later number from that chat as unverified.

Analyze Spreadsheets With Several Models in One App

You don't have to pick one chatbot for your data. Fello AI puts GPT, Claude, Gemini and other leading models in one app. Drop the same Excel file into a chat and ask Claude to find the outliers. When the answer looks off, ask GPT the same question, without a second subscription or a second upload page.

Fello AI reads Excel files directly and calls out trends and unusual values across sheets. Its Excel skill goes the other way and builds a finished .xlsx workbook with working formulas. The summary you asked for arrives as a file, not a table to copy by hand. It runs on Mac, iPhone and iPad, has a free tier, and holds a 4.7-star rating from more than 27,000 reviews.

Which AI Should You Use for Data Analysis?

Use Claude if you want free data analysis that really computes, and ChatGPT Plus if you want interactive charts and the 50MB spreadsheet ceiling. Use Copilot in Excel or Gemini in Sheets when the data already lives in a workbook and you want the changes made in place. Keep Perplexity for the research around your numbers, not the arithmetic. Whichever you choose, make it show its code before you put a number in front of anyone.

A chart you cannot check is a guess with axes.

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