Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Mythos Preview
99
o1
57
Verified leaderboard positions: Claude Mythos Preview #1 · o1 unranked
Pick Claude Mythos Preview if you want the stronger benchmark profile. o1 only becomes the better choice if knowledge is the priority or you want the cheaper token bill.
Knowledge
+0.8 difference
Claude Mythos Preview
o1
$25 / $125
$15 / $60
N/A
98 t/s
N/A
32.29s
1M
200K
Pick Claude Mythos Preview if you want the stronger benchmark profile. o1 only becomes the better choice if knowledge is the priority or you want the cheaper token bill.
Claude Mythos Preview is clearly ahead on the provisional aggregate, 99 to 57. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Mythos Preview is also the more expensive model on tokens at $25.00 input / $125.00 output per 1M tokens, versus $15.00 input / $60.00 output per 1M tokens for o1. That is roughly 2.1x on output cost alone. Claude Mythos Preview gives you the larger context window at 1M, compared with 200K for o1.
Claude Mythos Preview is ahead on BenchLM's provisional leaderboard, 99 to 57. The biggest single separator in this matchup is GPQA, where the scores are 94.5% and 75.7%.
o1 has the edge for knowledge tasks in this comparison, averaging 75.7 versus 74.9. Inside this category, GPQA is the benchmark that creates the most daylight between them.
For engineers, researchers, and the plain curious — a weekly brief on new models, ranking shifts, and pricing changes.
Free. No spam. Unsubscribe anytime.