Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
DeepSeek V4 Flash Base
31
GPT-5.4
88
Verified leaderboard positions: DeepSeek V4 Flash Base unranked · GPT-5.4 #16
Pick GPT-5.4 if you want the stronger benchmark profile. DeepSeek V4 Flash Base only becomes the better choice if you would rather avoid the extra latency and token burn of a reasoning model.
Knowledge
+13.9 difference
DeepSeek V4 Flash Base
GPT-5.4
$null / $null
$2.5 / $15
N/A
74 t/s
N/A
151.79s
1M
1.05M
Pick GPT-5.4 if you want the stronger benchmark profile. DeepSeek V4 Flash Base only becomes the better choice if you would rather avoid the extra latency and token burn of a reasoning model.
GPT-5.4 is clearly ahead on the provisional aggregate, 88 to 31. 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 52.2.
GPT-5.4 is the reasoning model in the pair, while DeepSeek V4 Flash Base 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 DeepSeek V4 Flash Base.
GPT-5.4 is ahead on BenchLM's provisional leaderboard, 88 to 31.
GPT-5.4 has the edge for knowledge tasks in this comparison, averaging 66.1 versus 52.2. DeepSeek V4 Flash Base stays close enough that the answer can still flip depending on your workload.
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