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Solar Pro 4

UpstageProprietaryPending Human Review

Solar Pro 4 is Upstage’s hosted commercial flagship for long-running enterprise agents. It focuses on terminal tasks, multi-turn tool use, document-grounded reasoning, and producing deliverables across multiple files. It supports English, Korean, and Japanese, adjustable reasoning effort, a 512K context, and up to 128K output tokens. The model is offered through Upstage Console and partner APIs rather than open weights. Its August 11 launch blog precedes the August 20 press release. Benchmarks depend on agent environments and do not guarantee task completion in a particular production workflow.

2026-08-11
Undisclosed
Proprietary

Specifications

Architecture
Undisclosed
License
Proprietary
Context Window
524,288 tokens
Max Output
131,072 tokens
Type
text
Modalities
text

Benchmark Scores

Advanced Specifications

Model Family
Solar
API Access
Available
Chat Interface
Available

Capabilities & Limitations

Capabilities
reasoningtool usestructured outputlong context
Known Limitations
Public weights are not offeredTool execution and retrieval require external systemsGenerated results require validation
Notable Use Cases
enterprise agentsdocument synthesishigh-volume automation
Function Calling Support
Yes
Tool Use Support
Yes

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