Head-to-head comparison across 4benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.8
93
GPT-5.5
91
Verified leaderboard positions: Claude Opus 4.8 #3 · GPT-5.5 #5
Pick Claude Opus 4.8 if you want the stronger benchmark profile. GPT-5.5 only becomes the better choice if agentic is the priority.
Agentic
+1.4 difference
Coding
+17.8 difference
Knowledge
+3.7 difference
Multimodal
+5.7 difference
Claude Opus 4.8
GPT-5.5
$5 / $25
$5 / $30
N/A
N/A
N/A
N/A
1M
1M
Pick Claude Opus 4.8 if you want the stronger benchmark profile. GPT-5.5 only becomes the better choice if agentic is the priority.
Claude Opus 4.8 has the cleaner provisional overall profile here, landing at 93 versus 91. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Claude Opus 4.8's sharpest advantage is in coding, where it averages 76.4 against 58.6. The single biggest benchmark swing on the page is OfficeQA Pro, 66.2% to 54.1%. GPT-5.5 does hit back in agentic, so the answer changes if that is the part of the workload you care about most.
GPT-5.5 is also the more expensive model on tokens at $5.00 input / $30.00 output per 1M tokens, versus $5.00 input / $25.00 output per 1M tokens for Claude Opus 4.8.
Claude Opus 4.8 is ahead on BenchLM's provisional leaderboard, 93 to 91. The biggest single separator in this matchup is OfficeQA Pro, where the scores are 66.2% and 54.1%.
Claude Opus 4.8 has the edge for knowledge tasks in this comparison, averaging 70.1 versus 66.4. 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 58.6. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
GPT-5.5 has the edge for agentic tasks in this comparison, averaging 81.5 versus 80.1. 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 70.4. Inside this category, OfficeQA Pro is the benchmark that creates the most daylight between them.
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