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It delivers frontier-level performance across software engineering and professional knowledge work, with particular strength in finance. Step 5 Preview is a sparse Mixture-of-Experts (MoE) model with 600B total parameters and 27B active parameters. It supports up to 1 million tokens of context and accepts text, images, and video, enabling sustained reasoning and tool use across complex tasks. Key Capabilities Software Engineering Step 5 Preview supports repository-level software engineering, frontend and visual development, and programming for devices. It can navigate large codebases, coordinate changes across files, run and verify code, and iterate on the results. Long-Horizon Agentic Execution Step 5 Preview can carry out tasks that require repeated tool calls, execution, verification, and revision, drawing on long-context information throughout the workflow. 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