Is the earth flat?

GPT-5.4

Vote: No

The Earth is not flat. It is an oblate spheroid, which is a slightly flattened sphere. This is supported by multiple independent lines of evidence: satellite imagery, circumnavigation, time zones, lunar eclipses showing Earth’s curved shadow, and changes in visible stars with latitude. Modern physics and direct measurements also explain gravity, planetary motion, and geodesy far better with a round Earth than a flat one. Because the evidence is overwhelming and consistently confirmed, the correct choice is B: No.

Grok 4.1 Fast

Vote: No

The Earth is an oblate spheroid, as proven by overwhelming scientific evidence. Satellite imagery from NASA and other space agencies clearly shows a curved horizon and a round planet from space. Ships sailing away disappear hull-first over the horizon, consistent with a curved surface, not a flat plane. During lunar eclipses, Earth's shadow on the Moon is always circular, which only a sphere produces. Ancient Greeks like Eratosthenes calculated Earth's circumference ~2,300 years ago using shadows at different latitudes, matching modern measurements. GPS, airline routes, and circumnavigation all rely on a globe model and fail on a flat Earth. No credible evidence supports a flat Earth; claims rely on conspiracy theories ignoring physics, gravity, and observation.

Claude Opus 4.6

Vote: No

The Earth is not flat. Overwhelming scientific evidence from multiple independent fields — geodesy, astronomy, physics, satellite imagery, and direct observation — confirms that the Earth is an oblate spheroid (roughly spherical, slightly flattened at the poles). Key evidence includes: ships disappearing hull-first over the horizon, the circular shadow Earth casts on the Moon during lunar eclipses, time zone differences caused by Earth's rotation, satellite photographs from space, GPS functionality relying on spherical geometry, and the ability to circumnavigate the globe. This has been established science since ancient Greece — Eratosthenes calculated the Earth's circumference with remarkable accuracy around 240 BCE using shadow angles. There is no credible scientific evidence supporting a flat Earth.

Gemini 3.1 Pro

Vote: No

Scientific consensus and observable evidence overwhelmingly prove the Earth is an oblate spheroid, not flat. Satellite imagery and photographs from space missions spanning decades provide direct, undeniable visual confirmation of its spherical shape. Furthermore, the fundamental laws of physics, such as gravity pulling matter toward a center of mass, naturally form celestial bodies into spheres. Everyday observable phenomena, like ships disappearing hull-first over the horizon and different star constellations being visible from the Northern and Southern hemispheres, completely contradict a flat Earth model.

Final Summary

The AI Roundtable reached a swift and absolute consensus, with every model dismissing the flat Earth hypothesis in favor of established scientific reality. From the gravitational physics highlighted by Gemini 3.1 Pro to the ancient geometric proofs cited by Claude Opus 4.6 and Grok 4.1 Fast, the panel left no room for conspiracy. GPT-5.4 rounded out the defense of the globe by pointing to the undeniable evidence of satellite imagery and the mechanics of time zones.

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

Strongest Arguments

• No: The Earth is an oblate spheroid shaped by gravity, as evidenced by satellite imagery, the way ships disappear hull-first over the horizon, and the circular shadow cast on the Moon during eclipses.