StepFun has not officially announced Step 5, but a preview version has already surfaced on Artificial Analysis. The listing describes Step 5 Preview as a multimodal reasoning model with roughly 600B total parameters, 27B active parameters per inference, image input support, and a 1 million-token context window. In Artificial Analysis’ latest Intelligence Index, the model scored 44, the same as Kimi K3 Max. On Terminal-Bench 4.0, Step 5 Preview posted 33% versus 13% for Kimi K3, while both models scored 59% on SciCode. Pricing on the page shows Step 5 Preview at $1 per million input tokens and $2.7 per million output tokens, compared with $3 and $15 for Kimi K3. That puts Step 5’s output cost at less than one-fifth of K3’s, while the cost of running the full Intelligence Index is about one-quarter of K3’s, based on Artificial Analysis figures. The report noted that Artificial Analysis had already completed its evaluation through the StepFun API, even though Step 5 has not yet been formally unveiled. The listed parameters and pricing were also described as not being the company’s final official figures.
StepFun has not formally unveiled Step 5, but a preview version has already appeared on Artificial Analysis.
According to the Artificial Analysis listing, Step 5 Preview is a multimodal reasoning model with about 600B total parameters and 27B active parameters per inference. It supports image input and a 1 million-token context window.
Benchmark results matched Kimi K3 Max on Intelligence Index
In the latest Intelligence Index, Step 5 Preview scored 44, matching Kimi K3 Max.
On Terminal-Bench 4.0, Step 5 Preview recorded 33%, while Kimi K3 posted 13%. On SciCode, both models scored 59%.
Pricing came in well below Kimi K3
Artificial Analysis listed Step 5 Preview at $1 per million input tokens and $2.7 per million output tokens. Kimi K3 was listed at $3 per million input tokens and $15 per million output tokens.
Based on those figures, Step 5’s output pricing is less than one-fifth of K3’s. Artificial Analysis’ cost to run the full Intelligence Index was also about one-quarter of K3’s.
Official launch has not happened yet
StepFun has not officially announced Step 5, but Artificial Analysis had already completed testing through the StepFun API. The report added that the currently listed parameters and pricing are not yet the company’s final official figures.
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