Forem: John_Stepfun

Step 3.5 Flash Series New Release! Available to All Step Plan Users!

John_Stepfun — Thu, 02 Apr 2026 10:07:39 +0000

StepFun's latest model, Step 3.5 Flash 2603, is now live. Open to all Step Plan users — welcome to try it!

This model is an optimized version of Step 3.5 Flash. Building on the Flash series' strengths of high response speed and low cost, it brings the following improvements:

Added low think mode, which further reduces token consumption and improves output efficiency in relevant scenarios.
Optimized training for Coding frameworks and Agent frameworks, enhancing experience, stability, and token efficiency.

From our testing, Step 3.5 Flash 2603 in default reasoning mode (high) achieves roughly the same reasoning scores while reducing token consumption by 14%; switching to low think mode results in a slight drop in reasoning scores, but token consumption drops by 56%.

We've noticed that OpenClaw users interact with AI differently — especially in Agent scenarios, where a large number of tasks are high-frequency but not particularly complex. Savvy users are already "allocating on demand": using heavyweight models for complex steps, and lightweight models for intermediate and high-frequency tasks. Not every request needs to "think deeply."

Based on this observation, we've further improved reasoning efficiency and flexibility on top of the already fast Step 3.5 Flash — making it "faster on top of fast," without sacrificing intelligence.

Feedback from early test users confirms this:

The intelligence actually improved — when handling complex tasks, it proactively fixes errors rather than just reporting them.

In a model evaluation conducted by an Agent ecosystem partner, Step 3.5 Flash showed a clear speed advantage in high-frequency Agent scenarios, with total time spent at just half that of competing models.

Get Started Now

Step 3.5 Flash 2603 is now available to all Step Plan users.
After subscribing to Step Plan, you can use this model in the usual way — simply switch the model to step-3.5-flash-2603. Below are examples of configuring thinking intensity using the OpenAI Chat Completions API and the Anthropic Messages API.

openai-style

{
  "model": "step-3.5-flash-2603",
  "messages": [
    {
      "role": "system",
      "content": "You are a helpful assistant. Be concise, accurate, and structured."
    },
    {
      "role": "user",
      "content": "Please explain why in enterprise-level AI applications, latency, stability, and cost are often more important than the peak capability of a single response."
    }
  ],
  "temperature": 0,
  "max_tokens": 250000,
  "reasoning_effort": "low"
}

anthropic-style

{
  "model": "step-3.5-flash-2603",
  "max_tokens": 250000,
  "thinking": {
    "type": "enabled",
    "budget_tokens": 10000
  },
  "output_config": {
    "effort": "low"
  },
  "messages": [
    {
      "role": "user",
      "content": "Please give a brief introduction to StepFun."
    }
  ]
}

We welcome everyone to try Step 3.5 Flash 2603!

platform.stepfun.com/step-plan/

You can also scan the QR code below to join our developer community and connect with our team and fellow developers~

OpenClaw StepFun Plugin Integration Guide

John_Stepfun — Tue, 31 Mar 2026 10:14:42 +0000

We have integrated StepFun into OpenClaw as a standalone plugin. Specifically, we have released an official plugin on ClawHub. Once users install this plugin, they can see StepFun models in the login menu.

This is the decoupled model configuration pattern recommended by OpenClaw. In this mode, model providers can independently maintain their model catalogs, authentication entries, and related configurations without being restricted by OpenClaw's main version release and review cycles.

After installing the plugin with a single line of code, users can find the StepFun configuration entry in OpenClaw's settings. From there, they can choose between Domestic (China) or Overseas regions, and select either the Standard API or Step Plan for integration.

Usage Details

The method of obtaining model lists via plugins was introduced in OpenClaw version 3.24. Given that version 3.24 contains several bugs, we strongly recommend that users upgrade to the latest version (version 3.28) before using this method.

To upgrade OpenClaw, please run:

npm i -g openclaw@latest

Step 1: Install the Plugin

Install the plugin and restart the OpenClaw Gateway service using the following commands:

openclaw plugins install clawhub:stepfun-openclaw-plugin@0.1.0
openclaw gateway restart

Step 2: Quick Configuration (Choose one of the two methods)

Option A: Interactive Wizard (Recommended for beginners)

Run the onboarding command to start the wizard:

openclaw onboard

During the process, select the StepFun authentication entry that suits you (e.g., Standard API Key or Step Plan API Key; see screenshots above). After completing the setup, set the model as default based on the system you are using:

Standard API: openclaw models set stepfun/step-3.5-flash
Step Plan: openclaw models set stepfun-plan/step-3.5-flash

After configuration, it is recommended to restart the Gateway service again (openclaw gateway restart) to load the status configurations.

Option B: CLI One-Click Configuration (Recommended for advanced users)

Users can also complete the configuration directly via the command line.

Example for Standard API (China Region):

openclaw onboard --auth-choice stepfun-standard-api-key-cn --stepfun-api-key <YOUR_KEY>
openclaw models set stepfun/step-3.5-flash
openclaw gateway restart

Example for Step Plan (China Region):

openclaw onboard --auth-choice stepfun-plan-api-key-cn --stepfun-api-key <YOUR_KEY>
openclaw models set stepfun-plan/step-3.5-flash
openclaw gateway restart

[AMA] StepFun Team here (Step 3.5 Flash) on reddit. Ask us anything!

John_Stepfun — Fri, 13 Feb 2026 03:45:04 +0000