step3

completions

byopenrouter

step3

completions

Published by: stepfun-aiProvider:

openrouter

Step3 is a cutting-edge multimodal reasoning model—built on a Mixture-of-Experts architecture with 321B total parameters and 38B active. It is designed end-to-end to minimize decoding costs while delivering top-tier performance in vision–language reasoning. Through the co-design of Multi-Matrix Factorization Attention (MFA) and Attention-FFN Disaggregation (AFD), Step3 maintains exceptional efficiency across both flagship and low-end accelerators.

Context

65536

Input

$0.57 / 1M tokens

Output

$1.42 / 1M tokens

Capabilities: tools

Accepts: text, image

Returns: text

Context: 65536 Input: $0.57 / 1M tokensOutput: $1.42 / 1M tokensCapabilities: toolsAccepts: text, imageReturns: text

Access step3 through LangDB AI Gateway

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Code Examples

Integration samples and API usage

Code Samples for step3

Python SDK Example:

from openai import OpenAI

client = OpenAI(
    base_url="https://api.us-east-1.langdb.ai/projects/<your_project_id>",
    api_key="<your_api_key>"
)

response = client.chat.completions.create(
    model="step3",
    messages=[
        {"role": "user", "content": "Hello, how are you?"}
    ]
)

print(response.choices[0].message.content)

TypeScript SDK Example:

import OpenAI from 'openai';

const client = new OpenAI({
    baseURL: "https://api.us-east-1.langdb.ai/projects/<your_project_id>",
    apiKey: "<your_api_key>"
});

const response = await client.chat.completions.create({
    model: "step3",
    messages: [
        { role: "user", content: "Hello, how are you?" }
    ]
});

console.log(response.choices[0].message.content);

cURL Example:

curl -X POST "https://api.us-east-1.langdb.ai/projects/<your_project_id>/v1/chat/completions" \
  -H "Authorization: Bearer <your_api_key>" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "step3",
    "messages": [
        {"role": "user", "content": "Hello, how are you?"}
    ]
  }'

Model: step3

Provider: openrouter

API Endpoint: $https://api.us-east-1.langdb.ai

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step3 by openrouter - AI Model Details, Pricing, and Performance Metrics

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Access step3 through LangDB AI Gateway

Code Examples

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