Step 3.5 Flash

Step 3.5 Flash by StepFun excels in the Coding category, where it ranks #103 with a composite score of 51/100. Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token. It is a reasoning model that is incredibly speed efficient even at long contexts. It is particularly strong in areas highlighted by its top benchmark performance and adoption metrics, making it suitable for both individual developers and enterprise teams looking for a reliable coding solution.

Step 3.5 Flash is priced at $0.10 per million input tokens and $0.30 per million output tokens (USD). Contact the provider for volume discounts and enterprise pricing. Pricing is competitive within the coding category and reflects the model's quality-to-cost ratio.

In the Coding category, Step 3.5 Flash holds rank #103 out of 6 models tracked. Its quality rank is #103 and adoption rank is #103. You can use our comparison tool at /compare to see detailed side-by-side metrics with specific alternatives. Key differentiators include its composite scoring across benchmarks, community sentiment, and real-world adoption rates.

Step 3.5 Flash has been evaluated across 6 different signals. Its strongest areas include Capabilities (43/100), Context Window (86/100), Output Capacity (90/100). These scores are derived from industry-standard benchmarks, community ratings, and real-world performance metrics. The composite score of 51/100 reflects a weighted combination of all tracked signals.

Step 3.5 Flash is a paid model, though some providers may offer trial credits or limited free tiers for evaluation. Check StepFun's website for current free tier availability and promotional offers.