Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Step 3.5 Flash is clearly ahead on the aggregate, 66 to 54. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Step 3.5 Flash's sharpest advantage is in mathematics, where it averages 84.5 against 67.5. The single biggest benchmark swing on the page is MMMU-Pro, 64 to 40.
Pick Step 3.5 Flash if you want the stronger benchmark profile. Grok Code Fast 1 only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
Step 3.5 Flash
60.2
Grok Code Fast 1
55.7
Step 3.5 Flash
47.1
Grok Code Fast 1
32.8
Step 3.5 Flash
66.7
Grok Code Fast 1
50.4
Step 3.5 Flash
78.3
Grok Code Fast 1
63.7
Step 3.5 Flash
60.8
Grok Code Fast 1
48
Step 3.5 Flash
87
Grok Code Fast 1
79
Step 3.5 Flash
82.8
Grok Code Fast 1
73.7
Step 3.5 Flash
84.5
Grok Code Fast 1
67.5
Step 3.5 Flash is ahead overall, 66 to 54. The biggest single separator in this matchup is MMMU-Pro, where the scores are 64 and 40.
Step 3.5 Flash has the edge for knowledge tasks in this comparison, averaging 60.8 versus 48. Inside this category, MMLU is the benchmark that creates the most daylight between them.
Step 3.5 Flash has the edge for coding in this comparison, averaging 47.1 versus 32.8. Inside this category, LiveCodeBench is the benchmark that creates the most daylight between them.
Step 3.5 Flash has the edge for math in this comparison, averaging 84.5 versus 67.5. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.
Step 3.5 Flash has the edge for reasoning in this comparison, averaging 78.3 versus 63.7. Inside this category, MuSR is the benchmark that creates the most daylight between them.
Step 3.5 Flash has the edge for agentic tasks in this comparison, averaging 60.2 versus 55.7. Inside this category, BrowseComp is the benchmark that creates the most daylight between them.
Step 3.5 Flash has the edge for multimodal and grounded tasks in this comparison, averaging 66.7 versus 50.4. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Step 3.5 Flash has the edge for instruction following in this comparison, averaging 87 versus 79. Inside this category, IFEval is the benchmark that creates the most daylight between them.
Step 3.5 Flash has the edge for multilingual tasks in this comparison, averaging 82.8 versus 73.7. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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