StepFun Step 5 Preview appears on OpenRouter behind an OpenAI-compatible API | Model Release
StepFun's Step 5 Preview, a sparse Mixture of Experts model for agentic work, was released and made available on the OpenRouter unified API on October 8, 2026,…
Published on MyPrivateClaw
Oct 10, 2026, 3:22 AM UTC
Coverage date
Oct 9, 2026
Last updated
Oct 10, 2026, 3:22 AM UTC
News summary
StepFun's Step 5 Preview model, described as a sparse Mixture of Experts model (27B active / 600B total parameters) for agentic work, was released and made available on the OpenRouter unified API on October 8, 2026, behind the OpenAI compatible OpenRouter API. OpenRouter lists availability on a single provider. As listed by OpenRouter for the StepFun hosted endpoint, Step 5 Preview has a 1,000,000 token context window with up to 64,000 completion tokens, and costs $1.00/M input tokens and $2.70/M output tokens with cache read at $0.05/M. The endpoint accepts text, images, and video inputs while returning text, and supports tool calling and structured outputs via JSON schema. Why it matters The significance here is the access path and the agent facing interface rather than a performance ranking: the model is reachable through OpenRouter's OpenAI compatible API, and OpenRouter lists it as…