Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Mistral Medium 3.5 128B
78
o3-mini
55
Pick Mistral Medium 3.5 128B if you want the stronger benchmark profile. o3-mini only becomes the better choice if you want the cheaper token bill.
Coding
+28.3 difference
Mistral Medium 3.5 128B
o3-mini
$1.5 / $7.5
$1.1 / $4.4
N/A
160 t/s
N/A
7.12s
256K
200K
Pick Mistral Medium 3.5 128B if you want the stronger benchmark profile. o3-mini only becomes the better choice if you want the cheaper token bill.
Mistral Medium 3.5 128B is clearly ahead on the provisional aggregate, 78 to 55. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Mistral Medium 3.5 128B's sharpest advantage is in coding, where it averages 77.6 against 49.3. The single biggest benchmark swing on the page is SWE-bench Verified, 77.6% to 49.3%.
Mistral Medium 3.5 128B is also the more expensive model on tokens at $1.50 input / $7.50 output per 1M tokens, versus $1.10 input / $4.40 output per 1M tokens for o3-mini. Mistral Medium 3.5 128B gives you the larger context window at 256K, compared with 200K for o3-mini.
Mistral Medium 3.5 128B is ahead on BenchLM's provisional leaderboard, 78 to 55. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 77.6% and 49.3%.
Mistral Medium 3.5 128B has the edge for coding in this comparison, averaging 77.6 versus 49.3. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
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