Traictory tracks 1 model from StepFun, based in CN. Its listed model, Step-3.5-Flash, was released in February 2026.
The strongest StepFun model in our data is Step-3.5-Flash, with an average benchmark score of 78.6% across 7 published results, including 74.0% on SWE-Bench and 97.0% on AIME 2025.
Step-3.5-Flash is priced at $0.10 per million input tokens and $0.40 per million output tokens. The largest context window is 66K tokens on Step-3.5-Flash. It is multimodal. StepFun publishes downloadable weights for it.
StepFun Models
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StepFun model catalog updated in 2026. See model comparisons and best models for coding.