Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Mythos Preview
99
o1-pro
29
Verified leaderboard positions: Claude Mythos Preview #1 · o1-pro unranked
Pick Claude Mythos Preview if you want the stronger benchmark profile. o1-pro only becomes the better choice if knowledge is the priority.
Knowledge
+4.1 difference
Claude Mythos Preview
o1-pro
$25 / $125
$150 / $600
N/A
N/A
N/A
N/A
1M
200K
Pick Claude Mythos Preview if you want the stronger benchmark profile. o1-pro only becomes the better choice if knowledge is the priority.
Claude Mythos Preview is clearly ahead on the provisional aggregate, 99 to 29. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
o1-pro is also the more expensive model on tokens at $150.00 input / $600.00 output per 1M tokens, versus $25.00 input / $125.00 output per 1M tokens for Claude Mythos Preview. That is roughly 4.8x on output cost alone. Claude Mythos Preview gives you the larger context window at 1M, compared with 200K for o1-pro.
Claude Mythos Preview is ahead on BenchLM's provisional leaderboard, 99 to 29. The biggest single separator in this matchup is GPQA, where the scores are 94.5% and 79%.
o1-pro has the edge for knowledge tasks in this comparison, averaging 79 versus 74.9. Inside this category, GPQA is the benchmark that creates the most daylight between them.
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