Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
GPT-5.2 Pro is clearly ahead on the aggregate, 90 to 49. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.2 Pro's sharpest advantage is in coding, where it averages 84.8 against 19.3. The single biggest benchmark swing on the page is SWE-bench Pro, 89 to 19.
GPT-5.2 Pro is the reasoning model in the pair, while Claude 3 Haiku 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 Pro gives you the larger context window at 400K, compared with 200K for Claude 3 Haiku.
Pick GPT-5.2 Pro if you want the stronger benchmark profile. Claude 3 Haiku only becomes the better choice if you would rather avoid the extra latency and token burn of a reasoning model.
GPT-5.2 Pro
85.9
Claude 3 Haiku
44
GPT-5.2 Pro
84.8
Claude 3 Haiku
19.3
GPT-5.2 Pro
96
Claude 3 Haiku
68.7
GPT-5.2 Pro
95.2
Claude 3 Haiku
59.6
GPT-5.2 Pro
81.5
Claude 3 Haiku
42.8
GPT-5.2 Pro
95
Claude 3 Haiku
76
GPT-5.2 Pro
93.4
Claude 3 Haiku
71.1
GPT-5.2 Pro
98.2
Claude 3 Haiku
62.2
GPT-5.2 Pro is ahead overall, 90 to 49. The biggest single separator in this matchup is SWE-bench Pro, where the scores are 89 and 19.
GPT-5.2 Pro has the edge for knowledge tasks in this comparison, averaging 81.5 versus 42.8. Inside this category, MMLU is the benchmark that creates the most daylight between them.
GPT-5.2 Pro has the edge for coding in this comparison, averaging 84.8 versus 19.3. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
GPT-5.2 Pro has the edge for math in this comparison, averaging 98.2 versus 62.2. Inside this category, HMMT Feb 2023 is the benchmark that creates the most daylight between them.
GPT-5.2 Pro has the edge for reasoning in this comparison, averaging 95.2 versus 59.6. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
GPT-5.2 Pro has the edge for agentic tasks in this comparison, averaging 85.9 versus 44. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
GPT-5.2 Pro has the edge for multimodal and grounded tasks in this comparison, averaging 96 versus 68.7. Inside this category, OfficeQA Pro is the benchmark that creates the most daylight between them.
GPT-5.2 Pro has the edge for instruction following in this comparison, averaging 95 versus 76. Inside this category, IFEval is the benchmark that creates the most daylight between them.
GPT-5.2 Pro has the edge for multilingual tasks in this comparison, averaging 93.4 versus 71.1. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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