DeepSeek V4 Pro vs Gemini 3.5 Flash

Pick Gemini 3.5 Flash if you want the stronger benchmark profile. DeepSeek V4 Pro only becomes the better choice if coding is the priority or you want the cheaper token bill.

Gemini 3.5 Flash is clearly ahead on the provisional aggregate, 88 to 70. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Gemini 3.5 Flash's sharpest advantage is in agentic, where it averages 77.2 against 59.1. The single biggest benchmark swing on the page is HLE, 7.7% to 40.2%. DeepSeek V4 Pro does hit back in coding, so the answer changes if that is the part of the workload you care about most.

Gemini 3.5 Flash is also the more expensive model on tokens at $1.50 input / $9.00 output per 1M tokens, versus $1.74 input / $3.48 output per 1M tokens for DeepSeek V4 Pro. That is roughly 2.6x on output cost alone. Gemini 3.5 Flash is the reasoning model in the pair, while DeepSeek V4 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.