# Step 5 Preview

> 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.

**ID**: `stepfun-ai/step-5-preview`  
**Creator**: stepfun-ai  
**Category**: text  
**Context**: 1M tokens  
**Input**: $1.08/M  
**Output**: $3.09/M  
**Released**: 2026-09-20  
**Web page**: https://anyrouter.dev/model/stepfun-ai/step-5-preview

**Input modalities**: text, image, video  
**Output modalities**: text  

**Tokenizer**: StepFun

**Capabilities**: chat, streaming, reasoning, coding, vision, function-calling, structured-output

**Supported parameters**: max_tokens, temperature, top_p, tools, tool_choice, response_format

## Usage

**Endpoint**: `POST https://anyrouter.dev/api/v1/chat/completions`

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

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| aihubmix-byok | $0 | $0 |

## Source

- Upstream docs: https://aihubmix.com/model/step-5-preview