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 nano
60
Pick Claude Sonnet 4.6 if you want the stronger benchmark profile. GPT-5.4 nano only becomes the better choice if you want the cheaper token bill or you need the larger 400K context window.
Agentic
+22.2 difference
Knowledge
+20.5 difference
Multimodal
+11.3 difference
Claude Sonnet 4.6
GPT-5.4 nano
$3 / $15
$0.2 / $1.25
44 t/s
191 t/s
1.48s
3.64s
200K
400K
Pick Claude Sonnet 4.6 if you want the stronger benchmark profile. GPT-5.4 nano only becomes the better choice if you want the cheaper token bill or you need the larger 400K context window.
Claude Sonnet 4.6 is clearly ahead on the provisional aggregate, 83 to 60. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Sonnet 4.6's sharpest advantage is in agentic, where it averages 65.1 against 42.9. The single biggest benchmark swing on the page is OSWorld-Verified, 72.1% to 39%.
Claude Sonnet 4.6 is also the more expensive model on tokens at $3.00 input / $15.00 output per 1M tokens, versus $0.20 input / $1.25 output per 1M tokens for GPT-5.4 nano. That is roughly 12.0x on output cost alone. GPT-5.4 nano 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 nano gives you the larger context window at 400K, compared with 200K for Claude Sonnet 4.6.
Claude Sonnet 4.6 is ahead on BenchLM's provisional leaderboard, 83 to 60. The biggest single separator in this matchup is OSWorld-Verified, where the scores are 72.1% and 39%.
Claude Sonnet 4.6 has the edge for knowledge tasks in this comparison, averaging 73.7 versus 53.2. Inside this category, HLE is the benchmark that creates the most daylight between them.
Claude Sonnet 4.6 has the edge for agentic tasks in this comparison, averaging 65.1 versus 42.9. Inside this category, OSWorld-Verified is the benchmark that creates the most daylight between them.
Claude Sonnet 4.6 has the edge for multimodal and grounded tasks in this comparison, averaging 77.4 versus 66.1. GPT-5.4 nano stays close enough that the answer can still flip depending on your workload.
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