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 38. 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 16.3. The single biggest benchmark swing on the page is LiveCodeBench, 75 to 11.
GPT-5.3 Instant is the reasoning model in the pair, while Grok 3 [Beta] 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. Grok 3 [Beta] 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
Grok 3 [Beta]
35.7
GPT-5.3 Instant
78.7
Grok 3 [Beta]
16.3
GPT-5.3 Instant
95
Grok 3 [Beta]
43.2
GPT-5.3 Instant
94.2
Grok 3 [Beta]
47.4
GPT-5.3 Instant
80.8
Grok 3 [Beta]
34
GPT-5.3 Instant
96
Grok 3 [Beta]
67
GPT-5.3 Instant
93.4
Grok 3 [Beta]
58.7
GPT-5.3 Instant
97.2
Grok 3 [Beta]
49.1
GPT-5.3 Instant is ahead overall, 87 to 38. The biggest single separator in this matchup is LiveCodeBench, where the scores are 75 and 11.
GPT-5.3 Instant has the edge for knowledge tasks in this comparison, averaging 80.8 versus 34. 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 16.3. 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 49.1. 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 47.4. 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 35.7. 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 43.2. 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 58.7. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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