Step 3.5 Flash
AffordableStepFun's fast and efficient language model.
Optimized for quick, cost-effective responses with strong Chinese and English support.
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Step 3.5 Flash is somewhat expensive at $0.10/M tokens input and $0.30/M tokens output. The model supports extended reasoning, a 262K context window.
Benchmarks
This model hasn't been evaluated by Artificial Analysis yet. Benchmark scores will appear once they're published.
Specifications
Performance
Providers
Misc
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Mistral Small 4vs Step 3.5 FlashFrequently Asked Questions about Step 3.5 Flash▼
When was Step 3.5 Flash released?
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Step 3.5 Flash was released on January 29, 2026.
Who created Step 3.5 Flash?
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Step 3.5 Flash was created by StepFun.
How much does Step 3.5 Flash cost?
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Step 3.5 Flash costs $0.10/M input tokens and $0.30/M output tokens.
What is Step 3.5 Flash API pricing?
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The Step 3.5 Flash API is priced at $0.10 per million input tokens and $0.30 per million output tokens. You can access Step 3.5 Flash through idapt.app alongside 200+ other AI models in one workspace.
Is Step 3.5 Flash a reasoning model?
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Yes, Step 3.5 Flash is a reasoning model. It can think step-by-step through complex problems before providing an answer, often yielding better results on difficult tasks like math, coding, and multi-step logic.
Does Step 3.5 Flash support image or vision input?
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No, Step 3.5 Flash does not currently support image or vision input. It is a text-only model.
Does Step 3.5 Flash support audio?
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No, Step 3.5 Flash does not support audio input.
What is the context window of Step 3.5 Flash?
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Step 3.5 Flash has a context window of 262K tokens, meaning it can process approximately 196,608 words of context at once.
Is Step 3.5 Flash open source?
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Step 3.5 Flash is a proprietary model developed by StepFun. The model weights and training data are not publicly available.
Where can I use Step 3.5 Flash?
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You can chat with Step 3.5 Flash on idapt.app — no separate API key required. idapt is an AI workspace with 200+ models, agents, computers, and tasks. You can also access Step 3.5 Flash through StepFun's own API or platform.