Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5.4 Pro is clearly ahead on the aggregate, 94 to 88. 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 79. The single biggest benchmark swing on the page is HLE, 50 to 26.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $2.00 input / $8.00 output per 1M tokens for GPT-5.2-Codex. That is roughly 22.5x on output cost alone. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 400K for GPT-5.2-Codex.
Pick GPT-5.4 Pro if you want the stronger benchmark profile. GPT-5.2-Codex only becomes the better choice if you want the cheaper token bill.
GPT-5.4 Pro
88.8
GPT-5.2-Codex
81.7
GPT-5.4 Pro
89
GPT-5.2-Codex
79
GPT-5.4 Pro
98
GPT-5.2-Codex
96.8
GPT-5.4 Pro
96.7
GPT-5.2-Codex
92.7
GPT-5.4 Pro
97
GPT-5.2-Codex
92
GPT-5.4 Pro
97
GPT-5.2-Codex
91
GPT-5.4 Pro is ahead overall, 94 to 88. The biggest single separator in this matchup is HLE, where the scores are 50 and 26.
GPT-5.4 Pro has the edge for knowledge tasks in this comparison, averaging 88.8 versus 81.7. 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 79. 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 96.8. 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 92.7. Inside this category, BBH 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 92. 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 91. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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