StepFun: Step 3.5 Flashstepfun
Bottom Line
StepFun: Step 3.5 Flash: $0.10/1M input, $0.30/1M output, 262K context, CPS grade B. Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
API Pricing (per 1M tokens)
| Input | $0.10 |
| Output | $0.30 |
| Cache Read | — |
| Cache Write | — |
| Blended (3:1) | $0.15 |
Specs & Performance
| Context Length | 262K |
| Max Output | 66K |
| Intelligence | 17 |
| Coding | 35 |
| Math | — |
| Speed | — |
| TTFT | — |
| CPS Grade | B |
| Input / Output Modalities | text → text |
More from stepfun
Looking for cheaper alternatives?
Find the cheapest model by task, or compare two models head-to-head.
FAQ
How much does the StepFun: Step 3.5 Flash API cost?
StepFun: Step 3.5 Flash costs $0.10/1M input tokens and $0.30/1M output tokens. Blended cost at a 3:1 ratio is about $0.15/1M tokens.
What is the context window of StepFun: Step 3.5 Flash?
StepFun: Step 3.5 Flash supports a 262K token context window with up to 66K output tokens.
Is StepFun: Step 3.5 Flash worth it?
StepFun: Step 3.5 Flash has a CPS grade of B (score 56), intelligence index 17, coding index 35. Use the compare page to benchmark against rivals.