DeepSeek V4 Pro vs GPT-5.4 Pro

Pick GPT-5.4 Pro if you want the stronger benchmark profile. DeepSeek V4 Pro only becomes the better choice if knowledge is the priority or you want the cheaper token bill.

GPT-5.4 Pro is clearly ahead on the provisional aggregate, 91 to 71. 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 agentic, where it averages 89.3 against 59.1. The single biggest benchmark swing on the page is HLE, 7.7% to 58.7%. DeepSeek V4 Pro does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.

GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $1.74 input / $3.48 output per 1M tokens for DeepSeek V4 Pro. That is roughly 51.7x on output cost alone. GPT-5.4 Pro 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. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 1M for DeepSeek V4 Pro.