step-3.5-flash

completions

byopenrouter

step-3.5-flash

completions

Published by: stepfunProvider:

openrouter

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.

Released

Feb 2, 2026

Knowledge

Aug 6, 2025

License

Apache-2.0

Context

256K

Input

$0.1 / 1M tokens

Output

$0.3 / 1M tokens

Cached

$0.02 / 1M tokens

Capabilities: tools, reasoning

Accepts: text

Returns: text

Released Feb 2, 2026Knowledge Cutoff: Aug 6, 2025License: Apache-2.0

Context: 256K Input: $0.1 / 1M tokensOutput: $0.3 / 1M tokensCached: $0.02 / 1M tokensCapabilities: tools, reasoningAccepts: textReturns: text

Access step-3.5-flash through LangDB AI Gateway

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Code Examples

Integration samples and API usage

Code Samples for step-3.5-flash

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="step-3.5-flash",
    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: "step-3.5-flash",
    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": "step-3.5-flash",
    "messages": [
        {"role": "user", "content": "Hello, how are you?"}
    ]
  }'

Model: step-3.5-flash

Provider: openrouter

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

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step-3.5-flash by openrouter - AI Model Details, Pricing, and Performance Metrics

step-3.5-flash

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Access step-3.5-flash through LangDB AI Gateway

Code Examples

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