Go beyond ChatGPT with the raw OpenAI API: o-series for deep reasoning on math and finance, GPT-5 for general tasks, and function-calling for deterministic workflows. ExcelGPT exposes every model with sensible defaults.
At a Glance
o-Series Reasoning
o3 / o4-mini think step-by-step on hard math, statistics and financial problems before answering.
Function Calling
Define deterministic steps (fetch exchange rates, run a stored proc) and let OpenAI orchestrate the flow.
Structured Output
Force JSON or tabular responses that fit straight back into your worksheet — no regex parsing needed.
Vision Understanding
GPT-5 with vision reads screenshots, PDFs and photos and converts them to structured rows.
Everything you can do with OpenAI for Excel & Google Sheets.
o-Series Reasoning
o3 / o4-mini think step-by-step on hard math, statistics and financial problems before answering.
Function Calling
Define deterministic steps (fetch exchange rates, run a stored proc) and let OpenAI orchestrate the flow.
Structured Output
Force JSON or tabular responses that fit straight back into your worksheet — no regex parsing needed.
Vision Understanding
GPT-5 with vision reads screenshots, PDFs and photos and converts them to structured rows.
Batch Mode
Run thousands of row-level operations in one API call — cheaper and faster than per-row chat.
Model Picker
Switch between GPT-5, GPT-4o, o3 and o4-mini per prompt — ExcelGPT remembers your last pick.
Real workflows where OpenAI shines.
Use Case
01
Quantitative finance
Use o-series to derive option Greeks, run VaR simulations, or validate complex DCF logic.
Use Case
02
Automated reporting pipelines
Chain function calls to pull live data, compute KPIs, and push a formatted report to a sheet.
Use Case
03
Bulk data enrichment
Enrich thousands of rows with classifications, entity extraction or translations using batch mode.
See what changes when you add AI to your spreadsheets.
| Feature | Excel alone | Excel + OpenAI |
|---|---|---|
| Natural language formulas | ||
| Auto data cleaning | ||
| Multi-sheet analysis | ||
| Plain-English explanations | ||
| Pivot & chart suggestions | ||
| VBA macro generation |
Results based on typical user workflows. Actual performance varies with data complexity.
ChatGPT for Excel uses GPT-4o / GPT-5 in chat mode. OpenAI for Excel exposes the full API surface — o-series reasoning, function calling, batch mode, vision — for power users who want fine-grained control.
No — ExcelGPT proxies the API on your behalf under your Pro or Team plan. Bring-your-own-key is supported on Enterprise.
Yes. o-series models are specifically strong at multi-step math and finance — they think through the problem before writing a formula.
Get Started
Free to start. No credit card required. Works with Excel, CSV, and Google Sheets.
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