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Step 5 Preview is StepFun's flagship multimodal model, a sparse mixture-of-experts (600B total, about 27B active parameters) with a 1M-token context window and text, image, and video input, released September 20, 2026 with open weights announced to follow. It is aimed at agentic coding, software engineering, and professional knowledge work, with particular strength in finance.
Claude Haiku 4.5 is Anthropic's fast, affordable small model in the Claude 4 generation, balancing strong instruction-following and coding ability with low latency. It is designed for high-throughput agentic and chat applications where speed and cost efficiency are priorities.
Benchmarks
Head-to-head scores across reasoning, coding, and agentic indices, plus per-domain rankings.
Intelligence
Claude Opus 5.5 (Max, Default Fallback)Claude Sonnet 5.5 (Max, Default Fallback)
