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Step 3.5 Flash

StepFunOpen weights262K contextReasoningTool calling

LMArena score 1403 · #149 overall · #125 in coding (2026-10-13)

As of Oct 15, 2026, Step 3.5 Flash costs $0.10 per million input tokens and $0.30 per million output tokens from SiliconFlow. The cheapest of 3 sellers is SiliconFlow at $0.10 / $0.30.

Lowest price, from Hugging Face

Pricing page

Per million tokens

Input
$0.10
Output
$0.30
Cached input
—
Batch input / output
—
  • Up to 256K output tokens per request.

Estimate your monthly cost

Est. per month = input tokens × input price + output tokens × output price. Prices are per million tokens, so 10M input tokens at $3.00 cost $30. ¹ The price is higher for long prompts (usually over 200K tokens); the estimate uses the base price.

From Hugging Face: $1.60 a month.

Where to buy it (3)

Sorted by your monthly estimate. Prices per million tokens.

  • Hugging Face

    Input / output
    $0.10 / $0.30
    Context
    262K
    Per month
    $1.60

    stepfun-ai/Step-3.5-Flash

  • OpenRouter

    Input / output
    $0.10 / $0.30
    Context
    262K
    Per month
    $1.60

    stepfun/step-3.5-flash

  • SiliconFlow

    Input / output
    $0.10 / $0.30
    Context
    262K
    Per month
    $1.60

    stepfun-ai/Step-3.5-Flash

Cloud and hosted sellers may add regional pricing, minimums or platform fees. Supports: Reasoning, Tool calling.

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