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Favicon for stepfun

stepfun

Access 2 stepfun models through the OpenRouter unified API including Step 3.7 Flash and Step 3.5 Flash. Compare pricing, context windows, benchmarks, and capabilities between different stepfun models.

stepfun tokens processed on OpenRouter

  • Favicon for stepfun
    StepFun: Step 3.7 FlashStep 3.7 Flash
    20% off
    68.8B tokens

    Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating roughly 11B parameters per token. The model supports a 256K context window and exposes selectable reasoning levels (high/medium/low), letting callers trade off speed, cost, and depth of reasoning. Designed for coding, agentic workflows, structured outputs, and long-context productivity tasks.

    by stepfunMay 28, 2026262K context$0.16/M input tokens$0.92/M output tokens
  • Favicon for stepfun
    StepFun: Step 3.5 FlashStep 3.5 Flash
    2.07B tokens

    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. It is a reasoning model that is incredibly speed efficient even at long contexts.

    by stepfunJan 29, 2026262K context$0.10/M input tokens$0.30/M output tokens

Frequently asked questions

OpenRouter serves 2 stepfun models behind one OpenAI-compatible API. Create an OpenRouter API key, point your client at https://openrouter.ai/api/v1, and set the model to an ID such as stepfun/step-3.7-flash. The quickstart has request examples for every supported SDK.

Step 3.7 Flash has the largest context window of any stepfun model on OpenRouter, accepting up to 262,144 tokens per request.

Step 3.7 Flash is the most recently added stepfun model on OpenRouter, listed on May 28, 2026.