Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
GPT-5.3 Instant is clearly ahead on the aggregate, 87 to 71. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.3 Instant's sharpest advantage is in coding, where it averages 78.7 against 49.2. The single biggest benchmark swing on the page is LiveCodeBench, 75 to 44.
o3-pro gives you the larger context window at 200K, compared with 128K for GPT-5.3 Instant.
Pick GPT-5.3 Instant if you want the stronger benchmark profile. o3-pro only becomes the better choice if you need the larger 200K context window.
GPT-5.3 Instant
82.9
o3-pro
70.4
GPT-5.3 Instant
78.7
o3-pro
49.2
GPT-5.3 Instant
95
o3-pro
74.1
GPT-5.3 Instant
94.2
o3-pro
83.6
GPT-5.3 Instant
80.8
o3-pro
67.1
GPT-5.3 Instant
96
o3-pro
82
GPT-5.3 Instant
93.4
o3-pro
81.1
GPT-5.3 Instant
97.2
o3-pro
89
GPT-5.3 Instant is ahead overall, 87 to 71. The biggest single separator in this matchup is LiveCodeBench, where the scores are 75 and 44.
GPT-5.3 Instant has the edge for knowledge tasks in this comparison, averaging 80.8 versus 67.1. Inside this category, HLE is the benchmark that creates the most daylight between them.
GPT-5.3 Instant has the edge for coding in this comparison, averaging 78.7 versus 49.2. Inside this category, LiveCodeBench is the benchmark that creates the most daylight between them.
GPT-5.3 Instant has the edge for math in this comparison, averaging 97.2 versus 89. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.
GPT-5.3 Instant has the edge for reasoning in this comparison, averaging 94.2 versus 83.6. Inside this category, MRCRv2 is the benchmark that creates the most daylight between them.
GPT-5.3 Instant has the edge for agentic tasks in this comparison, averaging 82.9 versus 70.4. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
GPT-5.3 Instant has the edge for multimodal and grounded tasks in this comparison, averaging 95 versus 74.1. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
GPT-5.3 Instant has the edge for instruction following in this comparison, averaging 96 versus 82. Inside this category, IFEval is the benchmark that creates the most daylight between them.
GPT-5.3 Instant has the edge for multilingual tasks in this comparison, averaging 93.4 versus 81.1. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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