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Step 3.5 Flash

stepfun/step-3-5-flash

MoE model (196B total, 11B active) with strong reasoning and 256K context. Free tier.

Specifications

Context Window 256K tokens
Max Output 8.2K tokens
Latency fast
Knowledge Cutoff
Training Data

Pricing

Input $0.00 per 1M tokens
Output $0.00 per 1M tokens

Capabilities

text Text generation and understanding
reasoning Advanced multi-step reasoning with chain-of-thought

API Identifiers

Model ID stepfun/step-3-5-flash
Provider API ID step-3-5-flash

Usage via Multi-Router

curl https://api.multi-router.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -H "x-mr-router-id: YOUR_ROUTER_ID" \
  -d '{
    "model": "stepfun/step-3-5-flash",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'