Step 3.5 Flash: pricing, specs, and how to use it (2026)
Step 3.5 Flash is an AI model from StepFun, available alongside ChatGPT, Claude, Gemini, and 300+ other models inside Admix on one subscription from $8.99/mo.
Quick specs
| Provider | StepFun |
| Model ID | stepfun/step-3.5-flash |
| Input price | $0.09 / 1M tokens |
| Output price | $0.30 / 1M tokens |
| Tier | starter |
| Accepts images | No |
| Category | Basic |
How to use Step 3.5 Flash in Admix
Open Admix, pick Step 3.5 Flash from the model list, and start chatting. You can also run the same prompt through Step 3.5 Flash and other frontier models like Claude, GPT-5, and Gemini side by side, then pick the best answer or spot disagreement. One subscription, no separate API key.
Compare Step 3.5 Flash with other AI models
These are popular comparisons to make alongside Step 3.5 Flash:
FAQ
What is Step 3.5 Flash?
Step 3.5 Flash is an AI model from StepFun, available inside Admix alongside 300+ other frontier and open-source AI models on one subscription.
How much does Step 3.5 Flash cost?
Step 3.5 Flash costs $0.09 per million input tokens and $0.30 per million output tokens. In Admix you use it inside one subscription starting at $8.99 per month, no separate API key required.
Can I compare Step 3.5 Flash with ChatGPT, Claude, or Gemini?
Yes. Admix lets you run the same prompt through Step 3.5 Flash and any of the other 300+ models in the catalog, then see the answers side by side.
Try Step 3.5 Flash in Admix
One subscription, 300+ AI models including Step 3.5 Flash. Compare any of them side by side from $8.99/mo.
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