What is Step-3.5-Flash's Neura Intelligence Index score?▾
Step-3.5-Flash by StepFun scores 73.0 out of 100 on the Neura Intelligence Index, ranking #55 among tracked AI models. This composite score is computed from 3 individual benchmarks across coding, math, reasoning, and language categories.
How much does Step-3.5-Flash cost to use?▾
Step-3.5-Flash costs $0.1/1M input tokens and $0.4/1M output tokens via API. At a typical 3:1 input-to-output ratio with 1M tokens/day usage, the estimated monthly cost is approximately $5.
Is Step-3.5-Flash open source?▾
Yes, Step-3.5-Flash has open weights available under the apache_2_0 license. You can download and self-host the model.
What is Step-3.5-Flash's context window?▾
Step-3.5-Flash supports a context window of 66K tokens, allowing it to process moderate-length documents and conversations in a single request.
What benchmark does Step-3.5-Flash perform best on?▾
Step-3.5-Flash achieves its highest score on AIME 2025 with a score of 97.3%. This benchmark evaluates american invitational mathematics examination 2025 — competition-level math problems.