Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Grok 4 and Step 3.5 Flash finish on the same overall score, so this is less about a single winner and more about where the edge shows up. The headline says tie; the benchmark table is where the real choice happens.
Step 3.5 Flash gives you the larger context window at 256K, compared with 128K for Grok 4.
Treat this as a split decision. Grok 4 makes more sense if multimodal & grounded is the priority; Step 3.5 Flash is the better fit if instruction following is the priority or you need the larger 256K context window.
Grok 4
58.1
Step 3.5 Flash
60.2
Grok 4
43.1
Step 3.5 Flash
47.1
Grok 4
78.2
Step 3.5 Flash
66.7
Grok 4
77.4
Step 3.5 Flash
78.3
Grok 4
63.8
Step 3.5 Flash
60.8
Grok 4
82
Step 3.5 Flash
87
Grok 4
80.8
Step 3.5 Flash
82.8
Grok 4
85.1
Step 3.5 Flash
84.5
Grok 4 and Step 3.5 Flash are tied on overall score, so the right pick depends on which category matters most for your use case.
Grok 4 has the edge for knowledge tasks in this comparison, averaging 63.8 versus 60.8. Inside this category, HLE 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 43.1. Inside this category, LiveCodeBench is the benchmark that creates the most daylight between them.
Grok 4 has the edge for math in this comparison, averaging 85.1 versus 84.5. Inside this category, HMMT Feb 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 77.4. Inside this category, LongBench v2 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 58.1. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Grok 4 has the edge for multimodal and grounded tasks in this comparison, averaging 78.2 versus 66.7. 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 82. 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 80.8. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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