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The council recommends
On: "Is it better to rent or buy a flat in a mid-sized European city if I plan to stay seven years?"
Top pick
Buy conditionally: verify local price-to-rent metrics first
A seven-year horizon comfortably clears the 5-year mark needed to absorb standard European transaction costs of 7–12%. You should buy if the city's price-to-annual-rent ratio is below 20 and total monthly carrying costs do not significantly exceed rent. If local valuations are stretched or your timeline is volatile, renting and investing the deposit difference in an index fund is safer.
Runner-up
Rent and invest the down payment into broad market index funds to preserve mobility and avoid high exit frictions.
Wildcard
Purchase a high-demand 2-room flat near transit with the explicit intent to rent it out if your plans shift early.
Best time
Calculate the specific city's price-to-rent ratio and secure fixed-rate mortgage pre-approval before beginning property viewings.
75%
aligned
Average confidence 70%
All experts agree seven years sits right at or above the typical break-even point, favoring buying if local numbers align.
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Where they agree
✓Seven years generally clears the 5-year break-even threshold needed to absorb heavy upfront purchase fees.
✓Upfront European transaction costs (notary, taxes, agent) run steep at 5% to 12% of the property value.
✓Buying is only advantageous if the buyer stays the entire duration rather than moving out in under 5 years.
Where they diverge
↔Google recommends buying outright, whereas OpenAI and Anthropic make buying strictly conditional on local metrics.
↔Anthropic emphasizes city-level price-to-rent ratios (under 20), while OpenAI focuses on loan structure and deposits.
↔Google highlights retaining the flat as a rental exit strategy, whereas the others focus on liquidating after 7 years.
The 3 takes
GPT-5.6 TerraLens · Financial safeguards
Lean toward buying only with a 20% deposit, fixed mortgage rates, and all-in monthly costs near comparable rents.
72% confident
Claude Sonnet 5.5Lens · Valuation & local yield
Buy if the price-to-rent ratio is under 20 (yield above 5%); otherwise, rent and invest your capital in an index fund.
62% confident
Gemini 3.8 FlashLens · Asset equity & fallback yield
Buy a well-located 2–3 room apartment, as 84 months exceeds typical European transaction cost recoupment.
75% confident
InstinctJev · TypeSafeCostly to undoMostly facts
Instinct said rent (54%). The council chose buy instead.
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Synthesized from 3 independent expert passes. Treat as informed input, not a guarantee. Your own judgment is the final vote.