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 58. 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 mathematics, where it averages 97.2 against 23.1. The single biggest benchmark swing on the page is AIME 2024, 99 to 23.1.
GPT-5.3 Instant is also the more expensive model on tokens at $1.75 input / $14.00 output per 1M tokens, versus $0.40 input / $1.60 output per 1M tokens for GPT-4.1 mini. That is roughly 8.8x on output cost alone. GPT-5.3 Instant is the reasoning model in the pair, while GPT-4.1 mini 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-4.1 mini gives you the larger context window at 1M, compared with 128K for GPT-5.3 Instant.
Pick GPT-5.3 Instant if you want the stronger benchmark profile. GPT-4.1 mini only becomes the better choice if you want the cheaper token bill or you need the larger 1M context window.
GPT-5.3 Instant
82.9
GPT-4.1 mini
56.5
GPT-5.3 Instant
78.7
GPT-4.1 mini
28.8
GPT-5.3 Instant
95
GPT-4.1 mini
69.6
GPT-5.3 Instant
94.2
GPT-4.1 mini
80.9
GPT-5.3 Instant
80.8
GPT-4.1 mini
62.4
GPT-5.3 Instant
96
GPT-4.1 mini
88.5
GPT-5.3 Instant
93.4
GPT-4.1 mini
72
GPT-5.3 Instant
97.2
GPT-4.1 mini
23.1
GPT-5.3 Instant is ahead overall, 87 to 58. The biggest single separator in this matchup is AIME 2024, where the scores are 99 and 23.1.
GPT-5.3 Instant has the edge for knowledge tasks in this comparison, averaging 80.8 versus 62.4. Inside this category, GPQA 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 28.8. Inside this category, SWE-bench Pro 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 23.1. Inside this category, AIME 2024 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 80.9. Inside this category, LongBench v2 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 56.5. 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 69.6. 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 88.5. 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 72. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.
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