Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
DeepSeek V4 Flash (High)
71
GPT-5.4 mini
69
Verified leaderboard positions: DeepSeek V4 Flash (High) #23 · GPT-5.4 mini unranked
Pick DeepSeek V4 Flash (High) if you want the stronger benchmark profile. GPT-5.4 mini only becomes the better choice if agentic is the priority.
Agentic
+10.2 difference
Knowledge
+0.2 difference
DeepSeek V4 Flash (High)
GPT-5.4 mini
$0.14 / $0.28
$0.75 / $4.5
N/A
201 t/s
N/A
3.85s
1M
400K
Pick DeepSeek V4 Flash (High) if you want the stronger benchmark profile. GPT-5.4 mini only becomes the better choice if agentic is the priority.
DeepSeek V4 Flash (High) has the cleaner provisional overall profile here, landing at 71 versus 69. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
GPT-5.4 mini is also the more expensive model on tokens at $0.75 input / $4.50 output per 1M tokens, versus $0.14 input / $0.28 output per 1M tokens for DeepSeek V4 Flash (High). That is roughly 16.1x on output cost alone. DeepSeek V4 Flash (High) gives you the larger context window at 1M, compared with 400K for GPT-5.4 mini.
DeepSeek V4 Flash (High) is ahead on BenchLM's provisional leaderboard, 71 to 69. The biggest single separator in this matchup is HLE, where the scores are 29.4% and 41.5%.
GPT-5.4 mini has the edge for knowledge tasks in this comparison, averaging 57.4 versus 57.2. Inside this category, HLE is the benchmark that creates the most daylight between them.
GPT-5.4 mini has the edge for agentic tasks in this comparison, averaging 65.6 versus 55.4. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.
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