Head-to-head comparison across 4benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Sonnet 4.5
68
Qwen3.5 397B
66
Verified leaderboard positions: Claude Sonnet 4.5 unranked · Qwen3.5 397B #10
Pick Claude Sonnet 4.5 if you want the stronger benchmark profile. Qwen3.5 397B only becomes the better choice if reasoning is the priority or you want the cheaper token bill.
Agentic
+0.9 difference
Coding
+16.9 difference
Reasoning
+49.6 difference
Knowledge
+18.2 difference
Claude Sonnet 4.5
Qwen3.5 397B
$3 / $15
$0 / $0
N/A
96 t/s
N/A
2.44s
200K
128K
Pick Claude Sonnet 4.5 if you want the stronger benchmark profile. Qwen3.5 397B only becomes the better choice if reasoning is the priority or you want the cheaper token bill.
Claude Sonnet 4.5 has the cleaner provisional overall profile here, landing at 68 versus 66. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Claude Sonnet 4.5's sharpest advantage is in knowledge, where it averages 83.4 against 65.2. The single biggest benchmark swing on the page is GPQA, 83.4% to 88.4%. Qwen3.5 397B does hit back in reasoning, so the answer changes if that is the part of the workload you care about most.
Claude Sonnet 4.5 is also the more expensive model on tokens at $3.00 input / $15.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Qwen3.5 397B. That is roughly Infinityx on output cost alone. Claude Sonnet 4.5 gives you the larger context window at 200K, compared with 128K for Qwen3.5 397B.
Claude Sonnet 4.5 is ahead on BenchLM's provisional leaderboard, 68 to 66. The biggest single separator in this matchup is GPQA, where the scores are 83.4% and 88.4%.
Claude Sonnet 4.5 has the edge for knowledge tasks in this comparison, averaging 83.4 versus 65.2. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Claude Sonnet 4.5 has the edge for coding in this comparison, averaging 77.2 versus 60.3. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Qwen3.5 397B has the edge for reasoning in this comparison, averaging 63.2 versus 13.6. Claude Sonnet 4.5 stays close enough that the answer can still flip depending on your workload.
Qwen3.5 397B has the edge for agentic tasks in this comparison, averaging 56.2 versus 55.3. Inside this category, VITA-Bench is the benchmark that creates the most daylight between them.
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