Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5.4 Pro is clearly ahead on the aggregate, 94 to 71. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.4 Pro's sharpest advantage is in coding, where it averages 89 against 52. The single biggest benchmark swing on the page is LiveCodeBench, 86 to 39.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 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. GPT-5.4 Pro is the reasoning model in the pair, while Qwen3.5 397B is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 128K for Qwen3.5 397B.
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Qwen3.5 397B only becomes the better choice if you want the cheaper token bill or you would rather avoid the extra latency and token burn of a reasoning model.
GPT-5.4 Pro
88.8
Qwen3.5 397B
67.7
GPT-5.4 Pro
89
Qwen3.5 397B
52
GPT-5.4 Pro
98
Qwen3.5 397B
81.9
GPT-5.4 Pro
96.7
Qwen3.5 397B
80
GPT-5.4 Pro
97
Qwen3.5 397B
82
GPT-5.4 Pro
97
Qwen3.5 397B
82
GPT-5.4 Pro is ahead overall, 94 to 71. The biggest single separator in this matchup is LiveCodeBench, where the scores are 86 and 39.
GPT-5.4 Pro has the edge for knowledge tasks in this comparison, averaging 88.8 versus 67.7. Inside this category, HLE is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for coding in this comparison, averaging 89 versus 52. Inside this category, LiveCodeBench is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for math in this comparison, averaging 98 versus 81.9. Inside this category, MATH-500 is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for reasoning in this comparison, averaging 96.7 versus 80. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for instruction following in this comparison, averaging 97 versus 82. Inside this category, IFEval is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for multilingual tasks in this comparison, averaging 97 versus 82. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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