Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5.4 Pro is clearly ahead on the aggregate, 94 to 49. 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 27.7. The single biggest benchmark swing on the page is LiveCodeBench, 86 to 18.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $0.15 input / $0.60 output per 1M tokens for Gemini 2.5 Flash. That is roughly 300.0x on output cost alone. GPT-5.4 Pro is the reasoning model in the pair, while Gemini 2.5 Flash 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 1M for Gemini 2.5 Flash.
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Gemini 2.5 Flash 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
Gemini 2.5 Flash
42.7
GPT-5.4 Pro
89
Gemini 2.5 Flash
27.7
GPT-5.4 Pro
98
Gemini 2.5 Flash
51.9
GPT-5.4 Pro
96.7
Gemini 2.5 Flash
56.3
GPT-5.4 Pro
97
Gemini 2.5 Flash
79
GPT-5.4 Pro
97
Gemini 2.5 Flash
74
GPT-5.4 Pro is ahead overall, 94 to 49. The biggest single separator in this matchup is LiveCodeBench, where the scores are 86 and 18.
GPT-5.4 Pro has the edge for knowledge tasks in this comparison, averaging 88.8 versus 42.7. Inside this category, GPQA 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 27.7. 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 51.9. Inside this category, HMMT Feb 2023 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 56.3. 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 79. 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 74. Inside this category, MGSM is the benchmark that creates the most daylight between them.
Get notified when new models drop, benchmark scores change, or the leaderboard shifts. One email per week.
Free. No spam. Unsubscribe anytime. We only store derived location metadata for consent routing.