Step 3.5 Flash
AffordableStepFun's fast and efficient language model.
Optimized for quick, cost-effective responses with strong Chinese and English support.
▼
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
Specifications
Performance
Providers
Misc
Compare with
GPT 6 Astravs Step 3.5 FlashGPT 5.6 Lunavs Step 3.5 Flash
Claude Fable 5.1vs Step 3.5 FlashClaude Opus 5vs Step 3.5 FlashClaude Sonnet 5vs Step 3.5 FlashClaude Haiku 4.5vs Step 3.5 Flash
Gemini 3.8 Flashvs Step 3.5 FlashGemini 3.5 Flashvs Step 3.5 FlashGemini 3.5 Flash-Litevs Step 3.5 FlashGemma 4 31Bvs Step 3.5 Flash
Grok 4.6vs Step 3.5 FlashGrok Build 0.1vs Step 3.5 FlashGrok 4.1 Fastvs Step 3.5 Flash
Muse Spark 1.3vs Step 3.5 Flash
DeepSeek V4 Pro (0813)vs Step 3.5 FlashDeepSeek V4 Flashvs Step 3.5 Flash
MiniMax M3vs Step 3.5 Flash
GLM 5.3vs Step 3.5 FlashGLM 5.3 Flashvs Step 3.5 Flash
Qwen3.8 Max (0902)vs Step 3.5 FlashQwen3.7 Plusvs Step 3.5 FlashQwen3 Coder Nextvs Step 3.5 Flash
Nemotron 3 Ultravs Step 3.5 FlashFrequently Asked Questions about Step 3.5 Flash▼
When was Step 3.5 Flash released?
▼
Step 3.5 Flash was released on January 29, 2026.
Who created Step 3.5 Flash?
▼
Step 3.5 Flash was created by StepFun.
How much does Step 3.5 Flash cost?
▼
Step 3.5 Flash costs $0.10/M input tokens and $0.30/M output tokens.
What is Step 3.5 Flash API pricing?
▼
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?
▼
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?
▼
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?
▼
No, Step 3.5 Flash does not support audio input.
What is the context window of Step 3.5 Flash?
▼
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?
▼
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?
▼
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.