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 34. 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 12.8. The single biggest benchmark swing on the page is SWE-bench Pro, 83 to 13.
GPT-5.3 Instant is the reasoning model in the pair, while Kimi K2 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.
Pick GPT-5.3 Instant if you want the stronger benchmark profile. Kimi K2 only becomes the better choice if you would rather avoid the extra latency and token burn of a reasoning model.
GPT-5.3 Instant
82.9
Kimi K2
29.3
GPT-5.3 Instant
78.7
Kimi K2
12.8
GPT-5.3 Instant
95
Kimi K2
39.5
GPT-5.3 Instant
94.2
Kimi K2
40.9
GPT-5.3 Instant
80.8
Kimi K2
29.3
GPT-5.3 Instant
96
Kimi K2
67
GPT-5.3 Instant
93.4
Kimi K2
59.7
GPT-5.3 Instant
97.2
Kimi K2
42.7
GPT-5.3 Instant is ahead overall, 87 to 34. The biggest single separator in this matchup is SWE-bench Pro, where the scores are 83 and 13.
GPT-5.3 Instant has the edge for knowledge tasks in this comparison, averaging 80.8 versus 29.3. Inside this category, MMLU 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 12.8. 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 42.7. 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 40.9. Inside this category, SimpleQA 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 29.3. 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 39.5. 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 67. 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 59.7. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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