Step 3.5 Flashon Krater.ai

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

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Released January 29, 2026

Specifications

Step 3.5 Flash at a glance

Context

262.1K tokens

Max output

65.5K tokens

Input

Text

Output

Text

Input price

$0.10 / 1M

Output price

$0.30 / 1M

Tool callingReasoning support

Capabilities

What it is good at

Catalog capabilities

  • Generates text responses
  • Supports tool calling

Good for

Long documentsUse with toolsDeep analysis

Benchmarks

Catalog data, not Krater benchmarks.

Intelligence index score

17

Step 3.5 Flash

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Compare Step 3.5 Flash

Step 3.5 Flash vs Step 3.7 Flash

Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model.

Open comparison

Step 3.5 Flash vs Step 5 Preview

Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters).

Open comparison

Step 3.5 Flash vs Step 3.5 Flash (free)

Step 3.5 Flash is StepFun's most capable open-source foundation model.

Open comparison

FAQ

Questions about Step 3.5 Flash

Clear answers based on the model catalog and Krater access.

Step 3.5 Flash supports a context window of 262,144 tokens.

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