Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Mythos Preview
99
Mistral Medium 3.5 128B
79
Verified leaderboard positions: Claude Mythos Preview #1 · Mistral Medium 3.5 128B unranked
Pick Claude Mythos Preview if you want the stronger benchmark profile. Mistral Medium 3.5 128B only becomes the better choice if you want the cheaper token bill.
Coding
+6.2 difference
Claude Mythos Preview
Mistral Medium 3.5 128B
$25 / $125
$1.5 / $7.5
N/A
N/A
N/A
N/A
1M
256K
Pick Claude Mythos Preview if you want the stronger benchmark profile. Mistral Medium 3.5 128B only becomes the better choice if you want the cheaper token bill.
Claude Mythos Preview is clearly ahead on the provisional aggregate, 99 to 79. 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 coding, where it averages 83.8 against 77.6. The single biggest benchmark swing on the page is SWE-bench Verified, 93.9% to 77.6%.
Claude Mythos Preview is also the more expensive model on tokens at $25.00 input / $125.00 output per 1M tokens, versus $1.50 input / $7.50 output per 1M tokens for Mistral Medium 3.5 128B. That is roughly 16.7x on output cost alone. Claude Mythos Preview gives you the larger context window at 1M, compared with 256K for Mistral Medium 3.5 128B.
Claude Mythos Preview is ahead on BenchLM's provisional leaderboard, 99 to 79. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 93.9% and 77.6%.
Claude Mythos Preview has the edge for coding in this comparison, averaging 83.8 versus 77.6. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
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