Head-to-head comparison across 3benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Sonnet 4.6
83
GPT-5.4 Pro
91
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Claude Sonnet 4.6 only becomes the better choice if knowledge is the priority or you want the cheaper token bill.
Agentic
+24.0 difference
Knowledge
+24.7 difference
Multimodal
+16.6 difference
Claude Sonnet 4.6
GPT-5.4 Pro
$3 / $15
$30 / $180
44 t/s
74 t/s
1.48s
151.79s
200K
1.05M
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Claude Sonnet 4.6 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 83. 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 65.3. The single biggest benchmark swing on the page is HLE, 49% to 58.7%. Claude Sonnet 4.6 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 $3.00 input / $15.00 output per 1M tokens for Claude Sonnet 4.6. That is roughly 12.0x on output cost alone. GPT-5.4 Pro is the reasoning model in the pair, while Claude Sonnet 4.6 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 200K for Claude Sonnet 4.6.
GPT-5.4 Pro is ahead on BenchLM's provisional leaderboard, 91 to 83. The biggest single separator in this matchup is HLE, where the scores are 49% and 58.7%.
Claude Sonnet 4.6 has the edge for knowledge tasks in this comparison, averaging 73.7 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 65.3. Claude Sonnet 4.6 stays close enough that the answer can still flip depending on your workload.
GPT-5.4 Pro has the edge for multimodal and grounded tasks in this comparison, averaging 94 versus 77.4. Claude Sonnet 4.6 stays close enough that the answer can still flip depending on your workload.
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