Step Zenith unveiled Step5Preview, a next-gen flagship AI model optimized for programming, software engineering, and finance. Featuring a 600B sparse MoE architecture with 27B active parameters, it supports a 1 million token context window and native multimodal input. The model ranks in the global top three for open-source intelligence, offering performance comparable to Claude Opus5 at one-eighth the cost. It balances intelligence, cost, and efficiency for real-world Agentic tasks. Step5Preview is scheduled for official open-source release on October 15, targeting complex professional workflows and enhancing overall operational effectiveness.