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 79. 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 66.1. The single biggest benchmark swing on the page is HLE, 44 to 27.
Pick GPT-5.3 Instant if you want the stronger benchmark profile. GPT-5 (high) only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
GPT-5.3 Instant
82.9
GPT-5 (high)
75.2
GPT-5.3 Instant
78.7
GPT-5 (high)
66.1
GPT-5.3 Instant
95
GPT-5 (high)
89.4
GPT-5.3 Instant
94.2
GPT-5 (high)
85.7
GPT-5.3 Instant
80.8
GPT-5 (high)
71.1
GPT-5.3 Instant
96
GPT-5 (high)
91
GPT-5.3 Instant
93.4
GPT-5 (high)
86.4
GPT-5.3 Instant
97.2
GPT-5 (high)
94
GPT-5.3 Instant is ahead overall, 87 to 79. The biggest single separator in this matchup is HLE, where the scores are 44 and 27.
GPT-5.3 Instant has the edge for knowledge tasks in this comparison, averaging 80.8 versus 71.1. 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 66.1. 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 94. 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 85.7. 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 75.2. 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 89.4. Inside this category, OfficeQA 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 91. 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 86.4. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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