Head-to-head comparison across 2benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Sonnet 5
94
GPT-5.4 Pro
90
Pick Claude Sonnet 5 if you want the stronger benchmark profile. GPT-5.4 Pro only becomes the better choice if agentic is the priority or you need the larger 1.05M context window.
Agentic
+7.5 difference
Knowledge
+8.4 difference
Claude Sonnet 5
GPT-5.4 Pro
$3 / $15
$30 / $180
N/A
74 t/s
N/A
151.79s
1M
1.05M
Pick Claude Sonnet 5 if you want the stronger benchmark profile. GPT-5.4 Pro only becomes the better choice if agentic is the priority or you need the larger 1.05M context window.
Claude Sonnet 5 is clearly ahead on the provisional aggregate, 94 to 90. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Sonnet 5's sharpest advantage is in knowledge, where it averages 57.4 against 49. The single biggest benchmark swing on the page is BrowseComp, 84.7% to 89.3%. GPT-5.4 Pro does hit back in agentic, 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 $3.00 input / $15.00 output per 1M tokens for Claude Sonnet 5. That is roughly 12.0x on output cost alone. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 1M for Claude Sonnet 5.
Claude Sonnet 5 is ahead on BenchLM's provisional leaderboard, 94 to 90. The biggest single separator in this matchup is BrowseComp, where the scores are 84.7% and 89.3%.
Claude Sonnet 5 has the edge for knowledge tasks in this comparison, averaging 57.4 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 81.8. Inside this category, BrowseComp is the benchmark that creates the most daylight between them.
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