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StepFun: Step 5 Preview

stepfun/step-5-preview

Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...

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Pricing

Input$0.7000 /M
Output$1.89 /M
Cache read$0.0350 /M

Specs

Context length1M tokens
Max output64K tokens
Inputtext, image, video
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-5-preview",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Supported parameters

frequency_penalty
include_reasoning
logprobs
max_tokens
reasoning
reasoning_effort
response_format
stop
structured_outputs
temperature
tools
top_logprobs
top_p