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 35. 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 multilingual, where it averages 82.8 against 42. The single biggest benchmark swing on the page is MMLU-ProX, 81 to 42.
Step 3.5 Flash is also the more expensive model on tokens at $0.10 input / $0.30 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Mixtral 8x22B Instruct v0.1. That is roughly Infinityx on output cost alone. Step 3.5 Flash gives you the larger context window at 256K, compared with 64K for Mixtral 8x22B Instruct v0.1.
Pick Step 3.5 Flash if you want the stronger benchmark profile. Mixtral 8x22B Instruct v0.1 only becomes the better choice if you want the cheaper token bill.
Step 3.5 Flash
60.2
Mixtral 8x22B Instruct v0.1
31.8
Step 3.5 Flash
47.1
Mixtral 8x22B Instruct v0.1
40
Step 3.5 Flash
66.7
Mixtral 8x22B Instruct v0.1
35.5
Step 3.5 Flash
78.3
Mixtral 8x22B Instruct v0.1
38.6
Step 3.5 Flash
60.8
Mixtral 8x22B Instruct v0.1
53
Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.
Step 3.5 Flash
82.8
Mixtral 8x22B Instruct v0.1
42
Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.
Step 3.5 Flash is ahead overall, 66 to 35. The biggest single separator in this matchup is MMLU-ProX, where the scores are 81 and 42.
Step 3.5 Flash has the edge for knowledge tasks in this comparison, averaging 60.8 versus 53. Inside this category, FrontierScience 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 40. Inside this category, HumanEval 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 38.6. 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 31.8. 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 35.5. Inside this category, OfficeQA Pro 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 42. Inside this category, MMLU-ProX is the benchmark that creates the most daylight between them.
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