Gemini 3.1 Pro vs GPT-5.4

Pick Gemini 3.1 Pro if you want the stronger benchmark profile. GPT-5.4 only becomes the better choice if you need the larger 1.05M context window or you want the stronger reasoning-first profile.

Gemini 3.1 Pro has the cleaner provisional overall profile here, landing at 92 versus 89. It is a real lead, but still close enough that category-level strengths matter more than the headline number.

Gemini 3.1 Pro's sharpest advantage is in multimodal & grounded, where it averages 82.8 against 72.7. The single biggest benchmark swing on the page is MMMU-Pro, 83.9% to 81.2%.

GPT-5.4 is also the more expensive model on tokens at $2.50 input / $15.00 output per 1M tokens, versus $2.00 input / $12.00 output per 1M tokens for Gemini 3.1 Pro. GPT-5.4 is the reasoning model in the pair, while Gemini 3.1 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 3.1 Pro.