Head-to-head comparison across 4benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.5
89
Qwen3.5-27B
65
Verified leaderboard positions: GPT-5.5 #2 · Qwen3.5-27B #12
Pick GPT-5.5 if you want the stronger benchmark profile. Qwen3.5-27B only becomes the better choice if knowledge is the priority or you want the cheaper token bill.
Agentic
+30.2 difference
Coding
+4.4 difference
Reasoning
+24.4 difference
Knowledge
+14.2 difference
GPT-5.5
Qwen3.5-27B
$5 / $30
$0 / $0
N/A
N/A
N/A
N/A
1M
262K
Pick GPT-5.5 if you want the stronger benchmark profile. Qwen3.5-27B only becomes the better choice if knowledge is the priority or you want the cheaper token bill.
GPT-5.5 is clearly ahead on the provisional aggregate, 89 to 65. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.5's sharpest advantage is in agentic, where it averages 81.8 against 51.6. The single biggest benchmark swing on the page is Terminal-Bench 2.0, 82.7% to 41.6%. Qwen3.5-27B does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
GPT-5.5 is also the more expensive model on tokens at $5.00 input / $30.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Qwen3.5-27B. That is roughly Infinityx on output cost alone. GPT-5.5 gives you the larger context window at 1M, compared with 262K for Qwen3.5-27B.
GPT-5.5 is ahead on BenchLM's provisional leaderboard, 89 to 65. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 82.7% and 41.6%.
Qwen3.5-27B has the edge for knowledge tasks in this comparison, averaging 80.6 versus 66.4. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Qwen3.5-27B has the edge for coding in this comparison, averaging 63 versus 58.6. GPT-5.5 stays close enough that the answer can still flip depending on your workload.
GPT-5.5 has the edge for reasoning in this comparison, averaging 85 versus 60.6. Qwen3.5-27B stays close enough that the answer can still flip depending on your workload.
GPT-5.5 has the edge for agentic tasks in this comparison, averaging 81.8 versus 51.6. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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