The standard account of the Great Sphinx is well known: it was built around 4,500 years ago during the Fourth Dynasty, under the rule of Pharaoh Khafre, and its face is his likeness. The statue was carved from a limestone ridge that remained after quarrying for the nearby pyramids, with the body of a lion and the head of a king, serving as a guardian monument within the Giza complex. This version of events has been repeated in textbooks, documentaries, and guidebooks for generations.

For years, that settled the question. More recently, however, a different inquiry was made. The AI system Grok, developed by Elon Musk’s company xAI, was asked who actually built the Sphinx. The system was given access to decades of research on the monument – erosion studies, laser surveys, climatic reconstructions, geological readings, and photographs from expeditions spanning a century. It was not instructed to support any particular theory or defend a specific date. It was asked to analyze the evidence and report what the data indicated.

The first significant finding concerned erosion. The Sphinx sits in a deep enclosure cut into the bedrock. The walls of this enclosure show deep, wavy vertical channels. Grok compared this pattern against known erosion signatures for wind-blown sand, salt crystallization, and rainfall. It concluded with 94.7% confidence that the erosion pattern matched rainfall, not wind or sand. The system also calculated how many years of sustained rainfall would have been needed to produce such wear, and estimated that the stone was exposed to heavy rain for many centuries. The last period when such rain fell on the Giza plateau ended roughly 7,000 years before Khafre’s reign, according to the analysis. This suggests the Sphinx may have already existed and been carved when those rains occurred.

The system then examined the proportions of the monument. The head is noticeably smaller than the body, a point that has been observed informally for years. Grok’s measurements concluded that the head is significantly out of proportion with the massive body, raising the possibility that the original head was larger and was later recarved. Erosion patterns on the head and neck differ from those on the body, with the head showing signs of dry, wind-driven weathering while the body shows the water-driven erosion described above. One engineer who reviewed the analysis noted that when a large carving is reduced to a smaller one, the sculptor is limited by the amount of stone available to remove. A smaller head, in this view, would be the remnant of something larger.

The system also considered astronomical alignments. The Sphinx faces due east, toward the point on the horizon where the sun rises at the spring equinox. The slow drift of the constellations means the background sky changes over thousands of years. Grok calculated when the constellation Leo would have risen at that exact point during the equinox dawn. The answer fell in a window between approximately 10,500 and 8,000 years before the present, a period known as the Age of Leo. An astronomer who reviewed the alignment said the probability of such a match occurring randomly was extremely low. This raises one of two possibilities: either a very unusual coincidence, or a monument deliberately oriented to mark a specific celestial era.

Beyond the Sphinx itself, the system was given data on other ancient structures around the world – terraces in the Andes, standing stones on a European plain, temple complexes on hillsides. When plotted on a map, these sites reportedly showed repeated geometric relationships and shared angles. The system also compared construction precision across these sites over time and found that the oldest structures were the most precisely built, with the finest joints and the most accurate alignments. Later construction showed declining accuracy, as though successive generations were replicating techniques without fully understanding them. One engineer reviewing this analysis said the pattern suggested a model was being followed, implying an original source for the design.

The system also noted an anomaly beneath the Sphinx itself. Ground-penetrating surveys have detected voids and chambers beneath the monument for decades. One such void, located below the paws, sits almost exactly on the equinox axis. The exact nature of this feature has not been confirmed.

Taken together, these findings point to a chronological contradiction. The mainstream attribution to Khafre is supported by proximity to his pyramid and the general timeline of the Old Kingdom. But the erosion evidence, the proportional issues, the astronomical alignment, and the global geometric patterns all suggest the structure may be significantly older than the official dating. None of this proves the existence of a lost civilization, and it does not confirm that the textbooks are wrong. It does, however, indicate that the monument has a more complex history than the standard explanation allows, and that parts of the structure may predate the civilization traditionally credited with its construction.

The geological record indicates that around 12,000 years ago, the region underwent significant climatic and environmental changes. Whatever structures may have existed before that time are difficult to identify with certainty, having been affected by rising seas and subsequent changes. The monuments that remain from the period after this transition may be attempts to preserve knowledge in durable form, carved into stone and aligned with the sky.

The Sphinx itself remains in the desert, facing the same horizon it has watched for millennia. It has not changed, and it has not hidden anything. The interpretation of its origins depends heavily on how the evidence is read and which chronological framework is applied. The current attribution to Khafre is firmly established, but the questions raised by the data have not been resolved. The monument can reasonably be described as older than some accounts suggest, but the full picture has yet to be determined. Whatever the original purpose of the structure, it will likely continue to be studied and debated for some time. The building technique, the alignment, and the erosion all remain subjects of active research. The full history of the monument is not yet known, and different scholarly approaches continue to produce different conclusions.