The 60-second AI chooser
Same brief, free model vs frontier model
Give a small free model and a frontier model the same agency task and the difference is not style, it is usefulness. The frontier model uses the brand rules, the data and the platform constraints you supplied. The free model writes something plausible and generic that someone then has to rewrite.
An illustrative example built from a typical agency request. The brief: "Using the attached brand book and last month's Instagram results, propose three posts for next week for a specialty coffee roaster. Our best post last month was a behind-the-scenes Reel of the roasting process. Tone: warm, expert, never pushy."
Post 1: "Start your morning right with our delicious coffee! ☕ #coffee #morning #coffeelover"
Post 2: "Did you know coffee is the second most traded commodity? Try ours today!"
Post 3: "Weekend vibes call for great coffee. Order now!"
Ignores the brand book and the data, and breaks the "never pushy" rule twice.
Post 1 (Reel, 30 s): Part two of the roasting series your audience loved: the first crack, filmed close. Caption explains what the sound means for flavour.
Post 2 (Carousel): "Three things your grinder setting is telling you", in the brand book's educational format.
Post 3 (Story): Poll on the next single origin to roast, feeding next month's content.
Builds on last month's winner, follows the format rules and stays warm and expert.
Illustrative example written by ZoomSphere to show the typical gap, not a benchmark. Run your own: take one real brief, give both models the same files, and compare how much editing each output needs.
Which AI should an agency buy?
Start from your existing stack. Google Workspace agencies get Gemini with business protections in their plan. Microsoft 365 agencies should evaluate Microsoft 365 Copilot. Agencies that want the strongest writing and the deepest connections to other software usually choose Claude Team or ChatGPT Business. Whatever you choose, choose the business plan, not a personal subscription.
| Option | Best for | Watch out for |
|---|---|---|
| Claude (Team, Enterprise) | Long documents, careful writing in the client's voice, projects with shared context, mature MCP connector support and agentic work | EU data residency is offered through cloud partners rather than the Team plan itself |
| ChatGPT (Business, Enterprise) | Broad all-rounder, image generation, large ecosystem, MCP connectors | EU data residency only on Enterprise and the API, not on Business |
| Gemini in Google Workspace | Agencies living in Gmail, Docs, Sheets and Drive; AI inside the files you already have | The free Gemini app is a different product with different data rules |
| Microsoft 365 Copilot | Agencies on Outlook, Teams and SharePoint; strong EU Data Boundary story | Value depends heavily on how organised your SharePoint and Teams data is |
Many agencies end up with two: the office suite AI for everyone, plus Claude or ChatGPT seats for the people who write, plan and run agents. That is a sensible pattern, as long as both are business plans.
The seven criteria that actually matter
- No training on your data, by contract. Not a toggle someone can forget, a clause in the terms.
- A data processing agreement. Without it you cannot lawfully put client personal data in the tool. See Level 2.
- Admin controls. Central billing, user management, ideally single sign-on, and the ability to remove access the day someone leaves.
- Shared projects or spaces. One place per client with the brand book and house rules, so every team member starts from the same context.
- Connectors and MCP. The AI must be able to reach your calendar, analytics and publishing tools, or it stays a smart notepad.
- Model quality on your real tasks. Test with three of your own briefs, not with benchmarks.
- Language quality. Test copy in every language you deliver in, including Czech, Slovak or Hungarian if those are your markets.
How much does it cost?
Business seats from the major vendors typically cost roughly 20 to 30 US dollars per user per month, with heavier usage tiers from about 100 dollars. One recovered hour per person per week pays for the seat many times over.
Example from an official price list: Claude Team costs $25 per standard seat per month ($20 billed annually), and premium seats with higher usage cost $125 ($100 billed annually), prices excluding VAT as of October 2026. Other vendors price business seats in the same range; check their current price pages, because they change often.
Source: claude.com/pricing ↗, checked Oct 5, 2026.
Do the maths for your own agency: seats × price, against hours saved × your internal hourly cost. If the AI saves a social media manager two hours a week on reporting and first drafts alone, the seat has paid for itself before the end of the first week of each month.
Who gets a licence first?
Do not buy 30 seats on day one. Give business seats to three to five people who will actually build workflows: typically a senior social media manager, a copywriter, an account manager and your AI champion. Let them document what works for 30 days (Level 3 has the plan), then roll out with templates instead of a blank chat window.