Head-to-head comparison across 5benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.5
80
GPT-5.2
83
Verified leaderboard positions: Claude Opus 4.5 #7 · GPT-5.2 unranked
Pick GPT-5.2 if you want the stronger benchmark profile. Claude Opus 4.5 only becomes the better choice if reasoning is the priority or you would rather avoid the extra latency and token burn of a reasoning model.
Agentic
+7.3 difference
Coding
+1.2 difference
Reasoning
+11.5 difference
Knowledge
+26.2 difference
Multimodal
+8.9 difference
Claude Opus 4.5
GPT-5.2
$null / $null
$2 / $8
46 t/s
73 t/s
1.01s
130.34s
200K
400K
Pick GPT-5.2 if you want the stronger benchmark profile. Claude Opus 4.5 only becomes the better choice if reasoning is the priority or you would rather avoid the extra latency and token burn of a reasoning model.
GPT-5.2 has the cleaner provisional overall profile here, landing at 83 versus 80. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
GPT-5.2's sharpest advantage is in knowledge, where it averages 92.4 against 66.2. The single biggest benchmark swing on the page is OSWorld-Verified, 66.3% to 47.3%. Claude Opus 4.5 does hit back in reasoning, so the answer changes if that is the part of the workload you care about most.
GPT-5.2 is the reasoning model in the pair, while Claude Opus 4.5 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-5.2 gives you the larger context window at 400K, compared with 200K for Claude Opus 4.5.
GPT-5.2 is ahead on BenchLM's provisional leaderboard, 83 to 80. The biggest single separator in this matchup is OSWorld-Verified, where the scores are 66.3% and 47.3%.
GPT-5.2 has the edge for knowledge tasks in this comparison, averaging 92.4 versus 66.2. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for coding in this comparison, averaging 65.9 versus 64.7. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for reasoning in this comparison, averaging 64.4 versus 52.9. GPT-5.2 stays close enough that the answer can still flip depending on your workload.
Claude Opus 4.5 has the edge for agentic tasks in this comparison, averaging 62.5 versus 55.2. Inside this category, OSWorld-Verified is the benchmark that creates the most daylight between them.
GPT-5.2 has the edge for multimodal and grounded tasks in this comparison, averaging 79.5 versus 70.6. Inside this category, CharXiv is the benchmark that creates the most daylight between them.
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