StepFun: Step 3.5 Flash
StepFunOpen weights
StepFun: Step 3.5 Flash by StepFun costs $0.10 per 1M input tokens and $0.30 per 1M output tokens, with a 262K-token context window.
Pricing
Input (per 1M tokens)
$0.10
Output (per 1M tokens)
$0.30
Cached input (per 1M)
$0.02
| Provider | Input / 1M | Output / 1M |
|---|---|---|
| StepFun | $0.10 | $0.30 |
| openrouter | $0.10 | $0.30 |
| StepFun (China) | $0.10 | $0.30 |
Specifications
- Provider
- StepFun
- Context window
- 262K tokens
- Parameters
- —
- Released
- Jan 2026
- Open weights
- Yes
- Frontier model
- No
- Hugging Face
- stepfun-ai/Step-3.5-Flash
Benchmarks
Speed & latency
Time to first token
0.47s
Output speed
22 tok/s
Fastest host: deepinfra (via hf-router).
Compare StepFun: Step 3.5 Flash with…
FAQ
How much does StepFun: Step 3.5 Flash cost?
StepFun: Step 3.5 Flash is priced at $0.10 per 1M input tokens and $0.30 per 1M output tokens. Output tokens cost more than input.
What is StepFun: Step 3.5 Flash's context window?
StepFun: Step 3.5 Flash supports a context window of 262K tokens — the maximum prompt plus response length it can handle in a single request.
Is StepFun: Step 3.5 Flash open weight?
Yes — StepFun: Step 3.5 Flash has openly available weights.
Data as of 2026-10-14. Source: Pricing via OpenRouter API, openrouter.ai. Pricing is per 1M tokens (USD); confirm with the provider before production use.