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StepFun: Step 3.5 Flash

stepfun/step-3.5-flash

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....

Pricing

Input$0.0700 /M
Output$0.2100 /M

Specs

Context length262.1K tokens
Max output65.5K tokens
Inputtext
Outputtext

Quickstart

Point the OpenAI SDK at https://tokenroute.app/api/v1 and use a TokenRoute API key.

bash
curl https://tokenroute.app/api/v1/chat/completions \
  -H "Authorization: Bearer $TOKENROUTE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "stepfun/step-3.5-flash",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Supported parameters

frequency_penalty
include_reasoning
max_tokens
reasoning
temperature
tool_choice
tools
top_k
top_p