Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Mythos Preview
99
Gemma 4 12B
53
Verified leaderboard positions: Claude Mythos Preview #1 · Gemma 4 12B unranked
Pick Claude Mythos Preview if you want the stronger benchmark profile. Gemma 4 12B only becomes the better choice if knowledge is the priority.
Coding
+11.8 difference
Knowledge
+2.9 difference
Multimodal
+23.3 difference
Claude Mythos Preview
Gemma 4 12B
$25 / $125
N/A
N/A
N/A
N/A
N/A
1M
256K
Pick Claude Mythos Preview if you want the stronger benchmark profile. Gemma 4 12B only becomes the better choice if knowledge is the priority.
Claude Mythos Preview is clearly ahead on the provisional aggregate, 99 to 53. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Mythos Preview's sharpest advantage is in multimodal & grounded, where it averages 92.4 against 69.1. The single biggest benchmark swing on the page is MMMU-Pro, 92.7% to 69.1%. Gemma 4 12B does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
Claude Mythos Preview gives you the larger context window at 1M, compared with 256K for Gemma 4 12B.
Claude Mythos Preview is ahead on BenchLM's provisional leaderboard, 99 to 53. The biggest single separator in this matchup is MMMU-Pro, where the scores are 92.7% and 69.1%.
Gemma 4 12B has the edge for knowledge tasks in this comparison, averaging 77.8 versus 74.9. Inside this category, HLE w/o tools is the benchmark that creates the most daylight between them.
Claude Mythos Preview has the edge for coding in this comparison, averaging 83.8 versus 72. Gemma 4 12B stays close enough that the answer can still flip depending on your workload.
Claude Mythos Preview has the edge for multimodal and grounded tasks in this comparison, averaging 92.4 versus 69.1. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
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