StepFun is a leading Chinese AI company in 2026, offering the StepFun AI chat platform powered by their flagship Step3 and Step 3.5 Flash models. Built on Mixture-of-Experts architecture with 321B total parameters and 38B active, StepFun excels in reasoning, coding, and multimodal tasks—achieving 74.4% on SWE-bench Verified and topping AIME 2025 benchmarks.

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