Open question · asked every run
Which planet has the most moons?
The right answer Saturn, with 293 confirmed moons as of August 2026.
Checked against JPL and NASA on Mon 12 Oct 2026
16 of 18 tries right in run 1 six apps · three tries each · Sat 3 Oct 2026
- ChatGPT
- Claude
- Copilot
- Gemini
- Grok
- Perplexity
Every answer that came back was right.
- ChatGPT: 3 of 3 right
- Claude: 3 of 3 right
- Copilot: 3 of 3 right
- Gemini: 3 of 3 right
- Grok: 1 of 3 right
- Perplexity: 3 of 3 right
Our view
Naming Saturn is the easy part. The count is where answers slip, because it keeps climbing and NASA's own pages can't agree on it.
Tip: Ask for the date the number is from, and trust the answer that can give you one.
dixon.ai, after run 1, Sat 3 Oct 2026
The official line
“Satellites of Saturn: 293”
“Saturn has 293 confirmed moons in its orbit as of August 2026, far more than any other planet in our solar system.”
Last read by us on Mon 12 Oct 2026. We read it before and after every run, and the key follows the page.
What we asked, word for word
Which planet in our solar system has the most moons, and exactly how many confirmed moons does it have now?
The same words to all six apps, three times each, in fresh chats, with no follow-up. This question is open: its wording, every answer and the key are published every run.
Why this one can trip an AI
The count keeps climbing as astronomers confirm more moons, so a figure an app learned in training is probably behind.
And NASA disagrees with itself. Its Saturn moons page says 293 in the text and 274 in the summary that search results show, and its Saturn facts page still has the older figure. An app that reads the snippet says 274, in exactly the same tone.
“As of March 2025, Saturn had 274 confirmed moons in its orbit”
The count, drawn
293 dotsOne gold dot for every confirmed moon of Saturn.
Run 1 · Sat 3 Oct 2026
What each app said, in its own words
16 of 18 tries right. The other two, both Grok's, came back empty (its own error message).
The pilot: the apps were on the plans we had that day, shown by each name. From run 2, every app is on its free plan.
-
Answer: 🪐 Saturn — 293 confirmed moons.
ChatGPT, try 1, as captured -
So 293 is the current confirmed figure, but it will likely keep rising.
Claude, try 1, as captured -
According to NASA, Saturn has 293 confirmed moons as of August 2026, which is more than any other planet in our Solar System.
Copilot, try 1, as captured -
It has 293 confirmed moons with recognized orbits.
Gemini, try 1, as captured -
Saturn has the most confirmed moons in our solar system, with 293 confirmed moons as of June 2026. ... but 293 is the widely cited current official figure for confirmed orbits.
Grok, try 1, as captured -
Saturn has the most confirmed moons of any planet in the Solar System: 293, as of June 2026.
Perplexity, try 1, as captured
What else we noticed
- All three of Perplexity's tries and Grok's one answer dated the figure June 2026; NASA's page says August. Right number, wrong month.
- One Perplexity try warned that older sources may still say 274, which is the trap, spotted and named.
Asking an AI something like this?
- Ask what date the number is from. A count that moves needs a date beside it.
- If two figures turn up, the newer one from the original source wins. Here that's JPL's table, which NASA's own page links to.
- Be wary of a round number. “About 290” sounds careful, but it answers a different question.
Confidently Wrong, every fortnight.
Each run's catch in your inbox, with the proof behind it and a check you can pinch.
Free. Leave whenever you like.