> For the complete documentation index, see [/llms.txt](/llms.txt).

# Solar Pro 4

> Source: /docs/models/solar-pro-4

Upstage's flagship model, specialized for agentic use

[Compare](/docs/models/compare/generative-intelligence)

- **Intelligence**: 5 (Higher)
- **Speed**: 5 (Fast)
- **Price**: $0.30/1M tokens (Input Token)
- **Price**: $1.20/1M tokens (Output Token)
- **Price**: $0.06/1M tokens (Cached Token)

Solar Pro 4 is Upstage's flagship model, specialized for agentic use. It is particularly strong at document-based work, coding, and business-related tasks, and substantially improves agent performance compared to Solar Pro 3. It supports a 512K context length with full English, Korean, and Japanese coverage.

- 512K context length
- Undisclosed parameters
- Feb, 2026 training data cut-off
- Reasoning mode available

## Languages

- English: Input and output
- Korean: Input and output
- Japanese: Input and output

## Capabilities

- [Chat](/docs/capabilities/generate/chat): Supported
- [Structured outputs](/docs/capabilities/generate/structured-outputs): Supported
- [Tool calling](/docs/capabilities/generate/tool-calling): Supported
- [Reasoning](/docs/capabilities/generate/reasoning): Supported

## Max output tokens

128K

## Available Platforms

- Upstage Console
- [Playground](/playground/chat)
- [On-premises](https://www.upstage.ai/contact-us?utm_medium=console&utm_source=docs-models&utm_content=text-link)

## Versions

### solar-pro4-260806 (Alias: solar-pro4)

Released on 2026-08-06

Training data cut-off: Feb, 2026

Solar Pro 4 is Upstage's flagship model, specialized for agentic use.

- Substantially improved agent performance compared to Solar Pro 3
- Particularly strong at document-based work, coding, and business-related tasks
- 512K context length and up to 128K output tokens
- Full English, Korean, and Japanese support
- Supports chat, reasoning, structured outputs, and tool calling
- Available platforms: Upstage Console, Playground, [On-premises](https://www.upstage.ai/contact-us?utm_medium=console&utm_source=docs-models&utm_content=text-link)

## API privacy

Data not collected

Upstage does not collect any data from this API

1. API input data is not used for model training.
2. API input data is not stored, unless required for service delivery and explicitly stated.

Free

Chat with Solar Pro 4 in the Playground!

✓ Chat with Solar Pro 4

✓ Configure & run in browser

✓ No API key needed - free to try

[Try it in the Playground](/playground/chat)

[Try the demo](https://solar-chat.upstage.ai)