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Step 5 Preview

Free
stepfun/step-5-preview

1M context · Sep 2026 · 4 upstreams

Step 5 Preview is StepFun's next-generation flagship base model designed for real-world tasks, with a focus on programming and professional expertise. A multimodal (text, image, video in / text out) base model with a 1M-token context and adjustable reasoning effort.

Preview release: behaviour, limits and pricing may change without notice.

context
1M
input / 1M
$0
output / 1M
$0
routes
4
speed, 24h
—

Upstreams

4
  1. 1Kilo CodePlatform · freeFreeTPS —TTFT ——
  2. 2AIHubMixYour key · not addedyour planTPS —TTFT ——
  3. 3OpenRouterYour key · not addedyour planTPS —TTFT ——
  4. 4Vercel AI GatewayYour key · not addedyour planTPS —TTFT ——

Try it

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Details

Owner
StepFun
Kind
Vision
Released
Sep 2026
Context
1M
Data policy
Provider retention
Endpoint
/api/v1/chat/completions

Quick start

curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "stepfun/step-5-preview",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'