Models
IntelligenceHigher
SpeedFast
Price
$0.30/1M tokensInput Token
Price
$1.20/1M tokensOutput Token
Price
$0.06/1M tokensCached 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
EnglishInput and output
KoreanInput and output
JapaneseInput and output
Capabilities
Max output tokens
128K
Available Platforms
Versions
solar-pro4-260806
Released on 2026-08-06Alias: solar-pro4
Training data cut-off: Feb, 2026Solar 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 β
API privacy
Data not collectedUpstage does not collect any data from this API
- API input data is not used for model training.
- API input data is not stored, unless required for service delivery and explicitly stated.
