Upstage Solar Pro4
Solar Pro 4 is Upstage’s agentic flagship model, released on August 6/10, 2026, with an undisclosed parameter count. It is available as a proprietary cloud service (additionally as dedicated/on-premises deployment for enterprise customers) and is designed for multi-step agentic workflows across documents, terminals, and tool calls. The model offers a context window of 524,288 tokens with up to 131,072 output tokens, supports English, Korean, and Japanese for input and output, and allows a configurable ‘Reasoning Effort’ (high for deep analysis, low for real-time chat speed).
- Proprietary
- Frontier
- OpenRouter
- Text
- Long Context
- Agentic Orchestrator
- Interactive
Sovereign Risk: MEDIUM Upstage is a South Korean company. The risk is rated as medium, as the exact hosting terms and the potential applicability of foreign laws (e.g., the US CLOUD Act, if hosted via US cloud infrastructure) are not publicly documented. Enterprise customers can contractually arrange dedicated or on-premises deployments, which can significantly reduce the risk for this user group.
Key metrics
Score · Latency · Cost · Quality
- Total Score Silver
- 75.42
- Routine
- 45.66
- Reasoning
- 29.76
- LLM Judge Avg
- 3.85 / 5
- 100 Coverage
- Avg Task Duration
- 35.61s
- Interactive
- Token Rate
- 35.86tok/s
- Output Rate
- P95 Latency
- 95.33s
- Top 5 %
- Total Tokens
- 72800
- Output Volume
- Cost per 1K
- $0.0001
- USD / 1K Requests
- Benchmark Cost
- $0.01
- Total · 72800 tok
Benchmark modules
10 modules · weighted · vs. model median & top performer
Token efficiency & latency
Consumption per module vs. model median
Token consumption per module
Performance profile
Key metrics – legend
Score
- Total Score
- Overall score derived from Routine and Reasoning scores. Basis for the fleet rank and tier assignment (Gold / Silver / Bronze).
- Routine
- Score for standard tasks: code generation, text transformation, structured outputs. Weighted by task complexity.
- Reasoning
- Score for analytical and logical tasks: multi-step problem solving, mathematical reasoning, structured argumentation.
- Rank
- Position in the fleet comparison, sorted by Total Score. Refers to the snapshot at the time of testing.
LLM Judge
- LLM Judge Ø
- Average quality rating by an independent judge model on a scale of 1–5.
- Coverage
- Share of tasks for which a judge rating is available. 100% means all responses were evaluated.
Latency & speed
- Avg. Task Duration
- Average time per task from the first to the last token of the response, measured across all benchmark tasks.
- Token Rate
- Output speed in tokens per second. Relevant for interactive applications and real-time streaming.
- P95 Latency
- 95th percentile of response times — shows outliers. Lower values mean fewer long wait times in edge cases.
Cost
- Cost per 1K
- API price per 1,000 output tokens in US dollars. Basis for cost calculation in production use.
- Benchmark Cost
- Total cost for the complete benchmark run of this model.