Model summary · Edition 1.0

Claude Opus 5High

These results come from one run: 7 fixed subjects, 5 rounds each, a 50-question limit, and reasoning setting high. They do not predict results on other subjects or settings.

This page always shows the model’s newest ranked run.

See all 35 rounds → All models

Every question, answer, guess, and source.

Rank: Rank 3of 18 models
Question score: 12.34 Lower is better. 95% confidence interval 11.41 to 13.27.
Rounds solved: 35 of 35 3 format errors
Guesser cost per round: $0.0705 Model time 1m 13s.

See how Claude Opus 5 (high) played. All 35 rounds, with every question, answer, guess, and source.

Observations

What stood out in this run.

Counts and ranks from this run only. A subject rank compares this model’s average on that subject with every other model in this edition. Each item links to its rounds.

Best ranks vs other models

Achilles: 2nd of 18 models, average 6.80 questions. round 1, round 2, round 3, round 4, round 5
Stephen King: 5th of 18 models, average 12.20 questions. round 1, round 2, round 3, round 4, round 5

Lowest ranks vs other models

Genghis Khan: 9th of 18 models, average 12.80 questions. round 1, round 2, round 3, round 4, round 5
Mario: 8th of 18 models, average 6.40 questions. round 1, round 2, round 3, round 4, round 5

Single rounds

Fewest questions in a solved round: 5, on Mario. round 2
Most questions in a solved round: 27, on Albert Schweitzer. round 5
Largest spread between rounds: Garfield, from 11 to 23 questions. round 1, round 2, round 3, round 4, round 5
3 wrong guesses in 35 rounds, never more than one per round. round 1

Failed rounds and format errors

3 format errors in 2 rounds. Each one before the question limit used a counted turn. Albert Einstein round 1, Genghis Khan round 4

Subjects

Results by subject.

Failed rounds count as 51 questions. Rank compares this subject's average with the other models in edition 1.0. Select a subject or a round to see the game.

Subject	Average questions	Subject rank	Solved	Rounds
Albert Einstein	9.60	6 of 18	5 of 5	14, 7, 10, 8, 9
Albert Schweitzer	24.60	6 of 18	5 of 5	23, 24, 24, 25, 27
Stephen King	12.20	5 of 18	5 of 5	13, 10, 12, 14, 12
Garfield	14.00	7 of 18	5 of 5	11, 23, 12, 11, 13
Achilles	6.80	2 of 18	5 of 5	7, 6, 7, 7, 7
Genghis Khan	12.80	9 of 18	5 of 5	12, 11, 14, 14, 13
Mario	6.40	8 of 18	5 of 5	6, 5, 8, 8, 5

Runs

Runs of this model.

Each edition ranks only the newest complete run of a model. Earlier runs are not ranked and their details are not published.

Current run in edition 1.0: BX-20260728-official-M0006-010, completed 28 Jul 2026.
Edition 1.1: rank 11 of 20, question score 18.07. Different rules and subjects, so scores are not comparable across editions.