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Step 5 Preview

stepfun-ai
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Step 5 Preview is StepFun's flagship model for agentic work. It is a sparse Mixture-of-Experts model with 600B total parameters and 27B active per token, a 1M-token context window, and text and image input. It delivers frontier-level performance in software engineering, long-horizon agentic execution with repeated tool calls, and professional knowledge work, with particular strength in finance.

Modalities

In / out price

$1.00 / $2.70per 1M

Cached price

$0.10per 1M

Context

1M

Max output

16K

Providers

2 routes

Compare providers by price, privacy, and speed.

DeepInfraDeepInfra
Private$1.00$2.70$0.101M16K——
Cheaper Inference
Anonymous$0.85$2.295$0.04251M64K——

Privacy

2 / 4

Private routing

Private tier

  1. Anonymous
  2. Private
  3. TEE
  4. E2EE

Prompt and response content is not retained after the request. Request content is visible to the inference runtime while it is being processed. Learn more

Features

6
Streaming
Tool calling
Vision
video input
Reasoning
Prompt caching

Uptime

FAQ

Common questions about Step 5 Preview.