According to CoinMeta and OneMillion.AI, a preview version of Step 5 has already appeared in artificial intelligence analyses. The performance of AA matches that of Kimi K3, with an output price of less than one-fifth of K3. Step 5 is a multimodal reasoning model, labeled with approximately 600B parameters in total, activating 27B per inference, and supporting image input as well as 1 million token contexts. In the latest intelligence index, the preview version of Step 5 scored 44, tying with Kimi K3 Max. Based on terminal-bench 4.0, the preview version of Step 5 scored 33%, while in scicode both scored 59%. Step 5 charges $1 per million inputs and outputs $2.7, whereas Kimi K3 charges $3 and $15 respectively. AA has completed evaluations through Stepfun API, but its parameters and prices have not yet been officially confirmed.