Gemini 2.5 Pro vs GPT-5.4

Pick GPT-5.4 if you want the stronger benchmark profile. Gemini 2.5 Pro only becomes the better choice if coding is the priority or you want the cheaper token bill.

GPT-5.4 is clearly ahead on the provisional aggregate, 89 to 64. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

GPT-5.4's sharpest advantage is in knowledge, where it averages 66.1 against 40.8. The single biggest benchmark swing on the page is HLE, 18.8% to 52.1%. Gemini 2.5 Pro does hit back in coding, so the answer changes if that is the part of the workload you care about most.

GPT-5.4 is also the more expensive model on tokens at $2.50 input / $15.00 output per 1M tokens, versus $1.25 input / $10.00 output per 1M tokens for Gemini 2.5 Pro. GPT-5.4 is the reasoning model in the pair, while Gemini 2.5 Pro 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 gives you the larger context window at 1.05M, compared with 1M for Gemini 2.5 Pro.