StepFun launches Step 5 Preview on OpenRouter with one-week free access in partner tools

AIStepFun's flagship model Step 5 Preview is free to use in Cline for one week. The quoted background says it scores ahead of Kimi K3 and GLM-5.3 on DeepSWE, positioning it among the strongest open-weights coding models.

AIStepFun is offering its flagship Step 5 Preview model free in OpenCode for one week, targeting agentic and professional work. The preview supports a 1M context window, multimodal input, and zero data retention.

AIOpenCode is offering free access to its Step 5 Preview for one week. The announcement highlights a 1M context window, multimodal support, and zero data retention.

AIOpenRouter announces that StepFun's Step 5 Preview is live on its platform, priced at $1.00 per million input tokens and $2.70 per million output tokens. Cache hits are 50% off at launch, bringing them to $0.05 per million. A week of free access is rolling out across partners including opencode, Cline, Nous Research, and Kilo Code.

AIStepFun's Step 5 Preview is now live on OpenRouter as the company's new flagship for agentic work. It uses a sparse MoE design with 27B active and 600B total parameters, a 1M context window, and accepts text, image, and video input. The post highlights strength in coding and professional knowledge work, especially finance.

AIStepFun's Step 5 Preview is now live on OpenRouter, with a week of free access rolling out across opencode, Cline, NousResearch, and Kilo Code. The company positions it as flagship-tier intelligence for agentic and professional work at substantially lower task cost, letting users keep their workflow while switching models.