Step 3.5 Flash pricing & price history
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.
Price history
No price changes since tracking began on 2026-09-24. We check every 10 minutes.
Cost calculator
Cheaper alternatives to Step 3.5 Flash
| Model | Input | Output | Context | Intel. | |
|---|---|---|---|---|---|
 GLM 5.3 Flash Z.ai (Zhipu) | $0.0399 | $0.0784 | 1M | 27.8 | compare |
 DeepSeek V4 Flash 0731 DeepSeek | $0.0434 | $0.30 | 1M | — | compare |
DeepSeek V4.1 Flash DeepSeek | $0.022 | $0.40 | 1M | — | compare |
DeepSeek V4.1 Flash 1017 DeepSeek | $0.098 | $0.29 | 1M | 28.6 | compare |
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About Step 3.5 Flash
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....
FAQ
How much does Step 3.5 Flash cost?
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. A typical request with 2,000 input and 500 output tokens costs about $0.0003.
What is the context window of Step 3.5 Flash?
Step 3.5 Flash supports up to 262,144 tokens of context and up to 65,536 output tokens per request.
Has Step 3.5 Flash’s price changed?
No price changes recorded since ModelBank started tracking it on 2026-09-24.
Is Step 3.5 Flash being deprecated?
No retirement date has been announced for Step 3.5 Flash as of 2026-11-12.
What are cheaper alternatives to Step 3.5 Flash?
Cheaper options include GLM 5.3 Flash ($0.0399/$0.0784), DeepSeek V4 Flash 0731 ($0.0434/$0.30), DeepSeek V4.1 Flash ($0.022/$0.40), DeepSeek V4.1 Flash 1017 ($0.098/$0.29).