Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
DeepSeek V4 Flash (Max)
77
GPT-5.4 Pro
91
Verified leaderboard positions: DeepSeek V4 Flash (Max) #12 · GPT-5.4 Pro unranked
Pick GPT-5.4 Pro if you want the stronger benchmark profile. DeepSeek V4 Flash (Max) only becomes the better choice if knowledge is the priority or you want the cheaper token bill.
Agentic
+26.0 difference
Knowledge
+11.0 difference
DeepSeek V4 Flash (Max)
GPT-5.4 Pro
$0.14 / $0.28
$30 / $180
N/A
74 t/s
N/A
151.79s
1M
1.05M
Pick GPT-5.4 Pro if you want the stronger benchmark profile. DeepSeek V4 Flash (Max) 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 77. 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 63.3. The single biggest benchmark swing on the page is HLE, 34.8% to 58.7%. DeepSeek V4 Flash (Max) 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 $0.14 input / $0.28 output per 1M tokens for DeepSeek V4 Flash (Max). That is roughly 642.9x on output cost alone. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 1M for DeepSeek V4 Flash (Max).
GPT-5.4 Pro is ahead on BenchLM's provisional leaderboard, 91 to 77. The biggest single separator in this matchup is HLE, where the scores are 34.8% and 58.7%.
DeepSeek V4 Flash (Max) has the edge for knowledge tasks in this comparison, averaging 60 versus 49. Inside this category, HLE is the benchmark that creates the most daylight between them.
GPT-5.4 Pro has the edge for agentic tasks in this comparison, averaging 89.3 versus 63.3. Inside this category, BrowseComp is the benchmark that creates the most daylight between them.
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