# Solar Mini 4

> Solar Mini 4 is Upstage's small, fast tier in the Solar 4 generation: a text-only model with a 524,288-token context window at roughly $0.05 / $0.20 per million input / output tokens. It is the cheap sibling of upstage/solar-pro4, not a packaging of it, so it gets its own listing row.

**ID**: `upstage/solar-mini4`  
**Creator**: upstage  
**Category**: text  
**Context**: 524K tokens  
**Input**: $0.05/M  
**Output**: $0.20/M  
**Released**: 2026-09-23  
**Web page**: https://anyrouter.dev/model/upstage/solar-mini4

**Input modalities**: text  
**Output modalities**: text  

**Capabilities**: chat, streaming, function-calling, reasoning

**Supported parameters**: frequency_penalty, include_reasoning, max_tokens, parallel_tool_calls, presence_penalty, reasoning, reasoning_effort, response_format, structured_outputs, temperature, tool_choice, tools, top_p

## 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": "upstage/solar-mini4",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

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

## Source

- Upstream docs: https://openrouter.ai/upstage/solar-mini4