GoKawiilStepFun's Step 5 Preview MoE model appears on OpenRouter with 1M context
StepFun has released Step 5 Preview, a sparse Mixture-of-Experts model with 27B active and 600B total parameters, now listed on OpenRouter. The model targets agentic workflows, supporting a 1-million-token context window for handling large codebases and documents. StepFun highlights its strength in software engineering, professional knowledge work, and finance-related tasks.
GoKawiil's interpretation of the reporting above, not reported fact.
The large context window and MoE design suggest StepFun is positioning Step 5 for multi-step, tool-using agents that need to reason over extensive material without losing track of earlier context. Its appearance on OpenRouter could make it easier for developers to test and compare against other agentic models like Claude or GPT variants. The emphasis on finance and professional knowledge work hints at StepFun targeting enterprise use cases rather than general consumer applications.
- Step 5 Preview is a sparse MoE model with 27B active and 600B total parameters.
- It supports a 1-million-token context window aimed at agentic, multi-step tasks.
- The model is now accessible via OpenRouter, with claimed strengths in coding, knowledge work, and finance.
Source: openrouter.ai, 2026-10-08
Published there as: “Step 5 Preview, a 1M-context MoE from StepFun, shows up on OpenRouter”
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