AI Matters
Why it matters
StepFun releases Step 5 Preview model for complex agent tasks
MarkTechPost StepFun Launches Step 5 Preview: A 600B-Total, 27B-Active MoE Model With 1M Context for Long-Horizon Agentic Work
StepFun launched Step 5 Preview, a mixture-of-experts model with 600 billion total parameters and a 1-million-token context window for text, images, and video.
Why it matters
Larger context windows and specialized architectures allow AI agents to handle much longer, more complex workflows in engineering and research.
Latest brief · Oct 19, 2026