Head-to-head comparison across 4benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.8
93
GPT-5.4
89
Verified leaderboard positions: Claude Opus 4.8 #3 · GPT-5.4 #15
Pick Claude Opus 4.8 if you want the stronger benchmark profile. GPT-5.4 only becomes the better choice if you want the cheaper token bill or you need the larger 1.05M context window.
Agentic
+3.1 difference
Coding
+18.7 difference
Knowledge
+4.0 difference
Multimodal
+3.4 difference
Claude Opus 4.8
GPT-5.4
$5 / $25
$2.5 / $15
N/A
74 t/s
N/A
151.79s
1M
1.05M
Pick Claude Opus 4.8 if you want the stronger benchmark profile. GPT-5.4 only becomes the better choice if you want the cheaper token bill or you need the larger 1.05M context window.
Claude Opus 4.8 is clearly ahead on the provisional aggregate, 93 to 89. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.8's sharpest advantage is in coding, where it averages 76.4 against 57.7. The single biggest benchmark swing on the page is OfficeQA Pro, 66.2% to 53.2%.
Claude Opus 4.8 is also the more expensive model on tokens at $5.00 input / $25.00 output per 1M tokens, versus $2.50 input / $15.00 output per 1M tokens for GPT-5.4. GPT-5.4 gives you the larger context window at 1.05M, compared with 1M for Claude Opus 4.8.
Claude Opus 4.8 is ahead on BenchLM's provisional leaderboard, 93 to 89. The biggest single separator in this matchup is OfficeQA Pro, where the scores are 66.2% and 53.2%.
Claude Opus 4.8 has the edge for knowledge tasks in this comparison, averaging 70.1 versus 66.1. Inside this category, HLE w/o tools is the benchmark that creates the most daylight between them.
Claude Opus 4.8 has the edge for coding in this comparison, averaging 76.4 versus 57.7. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Claude Opus 4.8 has the edge for agentic tasks in this comparison, averaging 80.1 versus 77. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.
Claude Opus 4.8 has the edge for multimodal and grounded tasks in this comparison, averaging 76.1 versus 72.7. Inside this category, OfficeQA Pro is the benchmark that creates the most daylight between them.
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