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Upstage

Upstage: Solar Pro 4

upstage/solar-pro4

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Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in office productivity, document-intensive work, and coding. When using BYOK with ZDR enforcement, the Console API key must belong to a ZDR-enabled Upstage organization. Contact Upstage to enable ZDR on your org.

Input
$0.09

/ 1M tokens

Output
$0.36

/ 1M tokens

Context window
524.29K

tokens

Limits

Context

524,288

tokens

Max output

131,072

25% of the context window

Model facts

Author

Upstage

Tokenizer

Other

Modality

Text -> Text

Created

Aug 10, 2026

Reasoning

Default MediumMaxXhighHighMediumLowMinimalNone

Publication status

Hugging Face: not mappedLicense: not publishedParameter count: not published

Modalities

Input · TextOutput · Text

Generation controls

Frequency penaltyInclude reasoningMax tokensParallel tool callsPresence penaltyReasoningReasoning effortResponse formatStructured outputsTemperatureTool choiceToolsTop p

Capability scores

52.7
Coding index

Better than 54% of models compared

28.2
Intelligence index

Better than 69% of models compared

Agent tasks

Category performance

Web apps
Top 84%

1096 Elo

30.0% win

Creative tasks

Category performance

3D
Top 51%

1179 Elo

46.4% win

Data visualization
Top 59%

1179 Elo

41.3% win

Games
Top 53%

1173 Elo

39.9% win

Code
Top 52%

1184 Elo

39.0% win

Websites
Top 59%

1178 Elo

37.5% win

UI components
Top 64%

1149 Elo

35.5% win