LONG MEMORY · StepFun

Step 5 Preview

Step 5 Preview is a reasoning, tool-using model from StepFun in the StepFun family, living in Snow Country (long memory). It reads text, images and video and writes text, with a 1.05M-token context window and up to 64K tokens of output. On OpenRouter it costs $1.00 per million input tokens and $2.70 per million output tokens.

See Step 5 Preview in 3D Open in the Worktable View on OpenRouter

Specifications

Provider: StepFun
Family: StepFun
Province: Snow Country
Context window: 1.05M tokens
Maximum output: 64K tokens
Input / 1M tokens: $1.00
Output / 1M tokens: $2.70
Accepts: text, images, video
Produces: text
Reasoning: Yes
Tool use: Yes
Added to OpenRouter: 2026-10-08
Model ID: stepfun/step-5-preview
Price history: —All recorded prices

From the 2026-10-24 catalog snapshot. Prices are US dollars per million tokens.

Embed this model card

Paste this HTML into your own page to show the card. It always shows the current guide data.

HTML snippet

<iframe src="https://sekai-world.vercel.app/embed/model/stepfun-step-5-preview/" title="Step 5 Preview · SEKAI" width="360" height="236" loading="lazy" style="border:0;max-width:100%"></iframe>