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Stepfun Pro · $9/month 10 tokens / message Balanced

StepFun: Step 3.5 Flash · Stepfun

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 for maximum efficiency.

Efficient MoE architecture Extended 262K token context Advanced open-source model

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About StepFun: 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 for maximum efficiency.

Where it shines: Efficient MoE architecture · Extended 262K token context · Advanced open-source model.

How to use StepFun: Step 3.5 Flash

  1. 1

    Type or upload

    Type what you want in the box above — or upload the file if the tool asks for one.

  2. 2

    Generate

    Click the main button. Wait 2-30 seconds depending on the model and input size.

  3. 3

    Download or share

    Download the result or share the direct link. No watermark, ready to use.

Frequently asked questions

How much does it cost to use StepFun: Step 3.5 Flash?

StepFun: Step 3.5 Flash is a Pro model: it costs 10 tokens per use (~$0.05 real cost for us). You need a Pro plan ($9/month → 15,000 tokens) or a one-shot pack. If you already have tokens in the free account, you can also spend them directly.

How many uses of StepFun: Step 3.5 Flash are included in the Pro plan?

Pro ($9/month) gives you 15,000 recurring tokens. At 10 tokens per use of StepFun: Step 3.5 Flash, that's ~1,500 full uses per cycle. If you run out, one-shot packs (5,000 / 25,000 / 80,000 tokens) add to the balance without expiring before one year.

What makes StepFun: Step 3.5 Flash special?

Its concrete strengths are: moe efficient architecture, extensive context 262k tokens and advanced open-source model.

How fast does StepFun: Step 3.5 Flash respond?

StepFun: Step 3.5 Flash has a balanced speed: 5-15 seconds per response — neither the fastest nor the slowest in the catalog. The actual time also depends on the length of the prompt and the load of the datacenter — models with huge context take longer when you enter very long texts.

How do I use StepFun: Step 3.5 Flash in ia.gratis?

You can use StepFun: Step 3.5 Flash from /chat/ by selecting StepFun: Step 3.5 Flash in the picker, or via the REST API with `model=step-3-5-flash` in the POST body. Quick summary: step 3.5 Flash: Advanced AI model with MoE architecture and 262K token context. The internal model identifier is `step-3-5-flash` — useful when integrating via API.