# R1 | anthropic/claude-opus-5 | run 2

## Prompt

In what year was the Eiffel Tower completed, and how tall is it including antennas? Cite your sources.

## Response

The Eiffel Tower was completed in **1889**, and it currently stands **330 metres (1,083 feet)** tall to the tip of its antennas.

## Completion DateConstruction began in January 1887 and finished on 31 March 1889, taking two years, two months and five days. The tower's operator confirms the same timeline, with the first digging work starting on 26 January 1887 and the Tower completed on 31 March 1889 ([Tour Eiffel official history](https://toureiffel.paris/en/the-monument/history)). It opened to the public on May 6, 1889 for the Exposition Universelle.

## Current Height

The 330 m figure dates from a 2022 antenna installation. On 15 March 2022, the Tower grew to 330 meters (1,083 feet) with the installation of a 6-meter radio antenna by TDF in preparation for DAB+ digital radio broadcasting ([Tour Eiffel news](https://www.toureiffel.paris/en/news/events/eiffel-tower-grows-330-meters-tall)). The new antenna raised it from 324 meters (1,063 feet) to 330 meters ([AP via Courthouse News](https://www.courthousenews.com/the-eiffel-tower-grows-even-higher-thanks-to-new-antenna/)).

## Height Breakdown

| Measurement | Height |
|---|---|
| Architectural (iron structure) | 300 m (984 ft) |
| At 1889 inauguration, incl. flagpole | ~312 m (1,024 ft) |
| Top accessible floor | 276 m (906 ft) |
| Tip, including antennas (current) | 330 m (1,083 ft) |

Wikipedia's infobox lists the same architectural height of 300 m (984 ft), a tip height of 330 m (1,083 ft), and a top floor at 276 m (906 ft) ([Eiffel Tower](https://en.wikipedia.org/wiki/Eiffel_Tower)). Note that on its inauguration day the Tower was topped by a large flagpole flying the French flag, taking its height to a little more than 312 metres (1,024 feet) — which is why older sources cite figures of 312 m, 320.75 m, or 324 m depending on the antenna era.

Would you like the history of how each antenna addition changed the tower's official height?
