阶跃星辰（StepFun）是中国头部大模型公司，创始人为前微软全球副总裁姜大昕。旗下 Step 系列模型覆盖多模态与推理，开源了 Step-1、Step-2 系列权重，登顶多项中文大模型榜单。2025 年发布推理模型 Step R-mini 与多模态模型 Step-3，Agent 能力与中文理解突出。 🔗 文章: /post/best-free-ai-apis-in-2026-10-providers-compared-for-developers-20260723
StepFun is a leading Chinese LLM company founded by Jiang Daxin, former Microsoft VP. Its Step model family covers multimodal and reasoning, with open-sourced Step-1/Step-2 weights topping Chinese LLM leaderboards. In 2025 it released reasoning model Step R-mini and multimodal Step-3, excelling in agentic ability and Chinese understanding. 🔗 Article: /post/best-free-ai-apis-in-2026-10-providers-compared-for-developers-20260723