Is the earth flat?

GPT-5.5

Vote: No

The correct choice is B: "No". Earth is not flat; it is an oblate spheroid, slightly flattened at the poles and bulging at the equator due to rotation. This is supported by extensive evidence, including satellite imagery, global navigation systems, circumnavigation, the way ships disappear over the horizon, Earth's curved shadow during lunar eclipses, and measurements from astronomy and geodesy.

Claude Opus 4.7

Vote: No

The Earth is an oblate spheroid, as confirmed by overwhelming scientific evidence: satellite imagery, circumnavigation, gravitational physics, the way ships disappear over the horizon hull-first, time zones, and direct observation from space. The flat Earth claim contradicts centuries of empirical evidence dating back to ancient Greek measurements by Eratosthenes.

Gemini 3.1 Pro

Vote: No

The Earth is an oblate spheroid, not flat. Centuries of scientific observation, including satellite imagery, circumnavigation, and gravitational physics, conclusively demonstrate its three-dimensional spherical shape. Furthermore, everyday observable phenomena—such as the curvature of the horizon, the way ships disappear hull-first over the ocean, and the Earth's curved shadow during lunar eclipses—provide undeniable proof of this reality.

Grok 4.3

Vote: No

The Earth is an oblate spheroid, as confirmed by centuries of scientific evidence including satellite images, gravitational measurements, and space exploration. Option "B: No" aligns with all observable facts and rejects the flat Earth misconception.

Final Summary

The AI Roundtable reached a swift and unanimous consensus, with all four models independently rejecting the flat Earth hypothesis in favor of scientific reality. GPT-5.5 and Claude Opus 4.7 grounded their positions in a mix of historical measurements and modern satellite data, while Gemini 3.1 Pro and Grok 4.3 noted that every observable physical law points toward an oblate spheroid.

No agreement after 1 rounds of discussion. Final vote: No: 4

Strongest Arguments

• No: The Earth is an oblate spheroid, a fact confirmed by a multi-century convergence of evidence including Eratosthenes' ancient measurements, the Earth's curved shadow during lunar eclipses, and direct visual confirmation from modern space exploration.