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 69. 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 42.8. The single biggest benchmark swing on the page is LiveCodeBench, 75 to 37.
Pick GPT-5.3 Instant if you want the stronger benchmark profile. GPT-5 mini only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
GPT-5.3 Instant
82.9
GPT-5 mini
65.7
GPT-5.3 Instant
78.7
GPT-5 mini
42.8
GPT-5.3 Instant
95
GPT-5 mini
83.8
GPT-5.3 Instant
94.2
GPT-5 mini
81.8
GPT-5.3 Instant
80.8
GPT-5 mini
62.8
GPT-5.3 Instant
96
GPT-5 mini
82
GPT-5.3 Instant
93.4
GPT-5 mini
80.1
GPT-5.3 Instant
97.2
GPT-5 mini
87.2
GPT-5.3 Instant is ahead overall, 87 to 69. The biggest single separator in this matchup is LiveCodeBench, where the scores are 75 and 37.
GPT-5.3 Instant has the edge for knowledge tasks in this comparison, averaging 80.8 versus 62.8. 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 42.8. 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 87.2. Inside this category, MATH-500 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 81.8. 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 65.7. Inside this category, OSWorld-Verified 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 83.8. 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 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 80.1. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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