Start with the job.
A custom spreadsheet can fit work that needs a structure you build and maintain. Model supplies a consistent engine and connected modules for repeatable underwriting.
Model, Spreadsheets, and AI Tools
Compare how Model, custom spreadsheets, and AI tools handle assumptions, calculations, scenario review, and handoff.
Model + your AI
- RequestAuthorized assistant
- CalculateModel's engine
- ReviewInputs and results
Custom spreadsheet + AI
- RequestAssistant or analyst
- CalculateWorkbook formulas
- ReviewFormulas and results
Workflow illustration. In Model, AI uses the calculation engine as a tool.
Choose the structure for the work.
Both approaches need clear assumptions and a careful review. The difference is how the model is built, maintained, and used.
Use AI where it helps.
An authorized AI assistant can organize assumptions and request scenarios through Model's MCP server. Model's engine performs the calculations.
Review the evidence.
Look at the inputs, equations, source dates, and checks. Neither a spreadsheet nor a tool removes the need to review the assumptions.
Side by side.
Compare calculation structure, scenario work, sources, and the handoff to another reviewer.
On a narrow screen, scroll the table horizontally. Feature names stay visible.
| Need | Model Workflow | In a custom or AI-assisted spreadsheet |
|---|---|---|
| Consistent calculations | Shared calculation engine | Depends on the workbook and how it is maintained. |
| Formula review | In-context explanations and live Excel export | Inspect the workbook formulas. |
| Scenarios | Saved plans and comparison | Build or maintain the comparison. |
| Data context | Source notes and dated assumptions entered with each input. | Record sources and refresh them in the workflow. |
| Review with others | Controlled links and workbook export | Share files or supported collaboration tools. |
| AI operation | Authorized MCP connection | Depends on tools and access. |
Reviewed . Workflows vary with the workbook, tools, and access you use.
Review the details.
Inspect the calculation, trace the source, or see how an AI request becomes a Model-calculated result.