Mathew PaquetTemplate · 5 min read

The Model Choice Sheet

Decide which AI model does which job, test it on your own file, and know what to check before anyone switches Claude on in Gemini Enterprise.

01 Keep the desk, change the chair

On October 8, Google said its newest model beats Anthropic's Claude on a coding test. The same day, it let its own customers switch Claude on. Two things launched:

Live now: if your company pays for Gemini Enterprise (Google's AI subscription for businesses), your admin can let developers use Claude Opus 5.5 and Claude Sonnet 5.5 in Antigravity, Google's AI coding tools. No separate Anthropic account. Billed through Google, by usage. Off by default. Preview only: the Gemini agent, an AI for work that takes on whole jobs. Google says it picks the model for each job, Gemini or Claude, and you can override it. Private preview, no date for everyone else.

Google Cloud's CEO, Thomas Kurian, put the idea in one line:

"Gemini is the agent, and the model underneath it is a separate choice."

Think of a desk and a chair. The desk is the app: your files, your history, your instructions, who can see what. The chair is the model, the part that does the thinking. You keep the desk and change who sits in the chair, job by job. Microsoft put Claude next to OpenAI's models in Copilot, and Amazon sells OpenAI's open models. You don't need Gemini Enterprise for the rest of this sheet. It works with the AI tools your team already pays for.

02 Sort the job: three questions

For each job, ask: how hard is it? How often does it run? What data does it touch?

Job The answers The model
Weekly client report Every week, same pattern A fast, cheaper model
Pitch rewrite for your biggest prospect A few times a year, has to be good The top model. Or two: one drafts, a different one reviews
Spreadsheet of every client's revenue Sensitive client data First question: is this tool approved for that data?

In Kurian's words: "The best model for the task is not always the largest one." Copilot already does the two-model version: one model drafts the research, a different one reviews it.

Job sorter
Job: [NAME OF THE JOB]
How hard is it? [ROUTINE / HAS TO BE GOOD]
How often does it run? [DAILY / WEEKLY / A FEW TIMES A YEAR]
What data does it touch? [PUBLIC / INTERNAL / CLIENT DATA]
Is this tool approved for that data? [YES / NO / ASK]
Model for this job: [MODEL]
Owner: [NAME]
03 Test it the boring way

Same real file, same instructions, two models. A demo file tells you nothing. Your messiest spreadsheet tells you a lot.

Two-model scorecard
File: [YOUR REAL FILE]
Instructions: [THE SAME INSTRUCTIONS FOR BOTH]

Model A: [ ] Model B: [ ]
Followed my instructions? [YES / NO] [YES / NO]
Got the numbers right? [YES / NO] [YES / NO]
Would I send it unrewritten? [YES / NO] [YES / NO]
What did it cost? [COST] [COST]
04 Keep your context in files you own

The best model will keep changing. Kurian says the leading model "changes every few months." Keep what makes the output yours on your own drive, not inside one vendor's app. Then switching models is a setting, not a migration.

A brand voice document. How you write, in your words.
Ten of your best posts. Examples any model can match.
The instructions for each repeat job. Like the weekly report, written once.
All of it saved in your own drive. So you can plug any model into it.
05 If you're the admin

Google's docs give the path: in the Google Cloud console, go to Gemini Enterprise, click Settings, open the AI developer tools tab, then Antigravity authorized models. Before you touch it:

Leave Claude off until someone names the job it's for. Use the job sorter above.
Know the hidden step: overages. Paying past what the plan includes must be turned on before Claude can be enabled.
Set a spend cap on the project. A monthly spending limit. Claude's usage counts toward it.
Decide which models are allowed, and write down which jobs go to which one. So the next person doesn't have to guess.
Give the switch one owner. Somebody's decision, not everybody's.
Ask Google in writing
When our team uses Claude inside Gemini Enterprise:
1. Is our information sent to Anthropic to be processed?
2. How long is it kept?
3. We are on the [EDITION] edition. Does it include this setting?

Check the fine print. Claude runs in Google's global, U.S. and E.U. locations, not single-country regions. Google's docs say its coding tools don't support certifications like ISO 27001, an information security standard some clients require. For the Business edition, Google hasn't said.

Sources

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Write down your three most common AI jobs and answer for each: how hard, how often, and what data it touches.

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