Stepfun于2026年9月18日发布了Step 5 Preview大模型。1该模型采用600亿参数架构，在Artificial Analysis Intelligence Index评测中获得44分，远超同价位竞品的中位数25分。1在性能、成本与速度的综合表现上，Step 5 Preview处于具有竞争力的位置。
从定价角度看，该模型的输入价格为每百万tokens 1.00美元，输出价格为每百万tokens 2.70美元，均明显低于同价位中位数的1.88美元和10.00美元。1在处理效率上，Step 5 Preview的吞吐量达到每秒99.8个tokens，超过中位数的65.0 tokens/秒，首字符延迟为2.96秒，略优于中位数的3.61秒。1该模型支持100万tokens的上下文窗口，并提供多模态能力，接受文本和图像输入，生成文本输出。1
根据评测数据，Step 5 Preview在测试中生成了1.6亿个输出tokens，超过同价位中位数的9000万tokens，总评测成本为918.34美元。1
Stepfun unveiled Step 5 Preview on September 18, 2026, a 60 billion-parameter reasoning model that achieved a score of 44 on the Artificial Analysis Intelligence Index, substantially exceeding the median score of 25 for models in the same price tier 1. The model demonstrates strong positioning across multiple performance dimensions relative to comparable offerings.
The Step 5 Preview operates at competitive pricing levels, with input costs set at $1.00 per million tokens against a tier median of $1.88, and output costs at $2.70 per million tokens compared to the median of $10.00 1. The model processes tokens at 99.8 tokens per second, outpacing the tier median of 65.0 tokens per second, while achieving a first-token latency of 2.96 seconds versus the median of 3.61 seconds 1. The model supports a context window of 1 million tokens and operates in multimodal mode, accepting text and image inputs while generating text outputs 1. During evaluation, the model generated 160 million output tokens at a total cost of $918.34, compared to the tier median of 90 million tokens 1.
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