Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.5
78
DeepSeek V4 Pro Base
43
Verified leaderboard positions: Claude Opus 4.5 #9 · DeepSeek V4 Pro Base unranked
Pick Claude Opus 4.5 if you want the stronger benchmark profile. DeepSeek V4 Pro Base only becomes the better choice if you need the larger 1M context window.
Reasoning
+12.9 difference
Knowledge
+2.8 difference
Multilingual
+1.3 difference
Claude Opus 4.5
DeepSeek V4 Pro Base
$5 / $25
$null / $null
46 t/s
N/A
1.01s
N/A
200K
1M
Pick Claude Opus 4.5 if you want the stronger benchmark profile. DeepSeek V4 Pro Base only becomes the better choice if you need the larger 1M context window.
Claude Opus 4.5 is clearly ahead on the provisional aggregate, 78 to 43. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.5's sharpest advantage is in reasoning, where it averages 64.4 against 51.5. The single biggest benchmark swing on the page is SuperGPQA, 70.6% to 53.9%.
DeepSeek V4 Pro Base gives you the larger context window at 1M, compared with 200K for Claude Opus 4.5.
Claude Opus 4.5 is ahead on BenchLM's provisional leaderboard, 78 to 43. The biggest single separator in this matchup is SuperGPQA, where the scores are 70.6% and 53.9%.
Claude Opus 4.5 has the edge for knowledge tasks in this comparison, averaging 66.2 versus 63.4. Inside this category, SuperGPQA is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for reasoning in this comparison, averaging 64.4 versus 51.5. Inside this category, LongBench v2 is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for multilingual tasks in this comparison, averaging 85.7 versus 84.4. DeepSeek V4 Pro Base stays close enough that the answer can still flip depending on your workload.
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