stepfun

StepFun 发布 Step 5 Preview 开放权重版本，采用稀疏 MoE 架构（600B 总参数、27B 激活参数），支持 100 万 token 上下文窗口及原生文本与视觉输入，面向长程智能体任务。

A user open-sourced a prompt that can generate a rotatable, interactive 3D miniature island scene, claiming that any agent or model can produce it with one click. They also mentioned that the new Chinese model Step 5 Preview topped OpenRouter’s Trending chart on its second day on the platform, delivering results comparable to Opus 5.5 at a lower price.

阶跃星辰发布旗舰基座模型 Step 5 Preview，登陆 OpenRouter 热榜第一，主打 AI 编程与软件工程，支持 1M token 上下文。用户实测将其接入 Claude Code，用 Three.js 生成可交互 3D 小岛，效果媲美 Opus 5.5 且成本更低。

StepFun's Step 5 Preview模型登上OpenRouter Trending榜首，用户实测用一张截图即生成完整可运行的Web应用，成本低于50美分，并展示了自主修复代码与自写测试的能力。

StepFun's Step 5 Preview, a mixture-of-experts model with a 1M-token context window, has been listed on OpenRouter for API access, making it available to developers across providers.

StepFun 宣布旗舰级新模型 Step 5 Preview 上线 OpenRouter，首周免费提供访问，面向 agentic 与专业工作场景，任务成本显著更低。

分享者介绍了如何用Step 5 Preview模型实现全屏滚动网站效果的工作流，并称赞其多模态与编码能力，该模型现已上线OpenRouter。

StepFun's new Step 5 Preview model is tested as a coding agent, demonstrating competitive performance with models like GLM 5.3 and excelling in long-horizon tasks due to its effective stopping behavior.

StepFun, a Chinese AI lab, has released Step 5 Preview, which matches the performance of Kimi K3 at one-third the cost, marking its entry into the AI frontier.

Stepfun's new AI model, Step 5 Preview, has been leaked, showing a significant version jump from 3.7 to 5.0 with major performance improvements.

The Stepfun Open Platform has launched a new step plan package, offering a 15-day free trial. Both new and existing users can participate, and inviting friends can extend the trial period.

Pull request adding support for StepFun 3.5 MTP model in llama.cpp.

Stepfun 3.7 Flash model generates a Sonic-like platformer game from a single prompt, demonstrating impressive control and speed.

StepFun_ai highlights a thoughtful take on the Step 3.7 Flash model and its implications for agent efficiency.

Stepfun 3.7 Flash is a compact vision model that achieves aesthetics close to GLM 5.1 and 80% of its 3D world understanding, while using only 25% of the parameters, making it highly RAM-efficient.

StepFun releases Step-3.7-Flash, a new large vision-language MoE model with 198B parameters (11B active), 256K context, and up to 400 tokens/sec inference speed.

StepFun releases GGUF quantizations of their 198B-parameter sparse MoE vision-language model Step-3.7-Flash, enabling local deployment with up to 256K context and selectable reasoning levels.

Nous Research announces that Step 3.5 Flash from StepFun will be available for free on the Nous Portal for the next 15 days.