Language modelActive
Solar Pro 2
Upstage
- Released
- July 2025
- Data date
- September 8, 2026
- Successor
- Solar Pro 3
- Price
- Input · Output / 1M tokens
Solar Pro 2 remains a dense 31-billion-parameter checkpoint that combines reasoning, tool use, and multilingual work with a 64K-token context. Upstage highlights multi-step and Korean use cases.
Upstage explicitly calls Solar Pro 3 its latest update and says existing Pro 2 users can switch without configuration changes. Pro 2 remains a separate model endpoint while Upstage identifies Pro 3 as the newest Solar path.
Specifications and access
| Specification | Value and source |
|---|---|
| Weights | ProprietarySource |
| Access | APISource |
| Parameters | 31BSource |
| Context window | 65,536 tokensSource |
| Notes | 31B-parameter dense model with a 64K context window.Source |
| Release | 2025-07 (Month-only precision; source did not expose an exact day.)Source |
| Parameters | 31 BSource |
| Architecture | dense 31B modelSource |
Page 1 of 4
Measurements without matching peer values
These measurements have no matching peer values under the same test conditions. Their original values and sources remain available here.
Ko-Arena-Hard-v0.1 (Show measurement, test conditions, and source)
- Source value
- 71.09
- Score
- 71.09
- Metric
- percent
- Unit
- %
- Category
- preference
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. [R, Reasoning] column; official language benchmark table image
Ko-Arena-Hard-v0.1 (Show measurement, test conditions, and source)
- Source value
- 61.9
- Score
- 61.9
- Metric
- percent
- Unit
- %
- Category
- preference
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Solar Pro 2 column; official language benchmark table image
Ko-MMLU (0shot, CoT) (Show measurement, test conditions, and source)
- Source value
- 84.64
- Score
- 84.64
- Metric
- percent
- Unit
- %
- Category
- knowledge
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. [R, Reasoning] column; official language benchmark table image
Ko-MMLU (0shot, CoT) (Show measurement, test conditions, and source)
- Source value
- 79.96
- Score
- 79.96
- Metric
- percent
- Unit
- %
- Category
- knowledge
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Solar Pro 2 column; official language benchmark table image
KMMLU (0shot) (Show measurement, test conditions, and source)
- Source value
- 77.04
- Score
- 77.04
- Metric
- percent
- Unit
- %
- Category
- knowledge
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. [R, Reasoning] column; official language benchmark table image
KMMLU (0shot) (Show measurement, test conditions, and source)
- Source value
- 72.04
- Score
- 72.04
- Metric
- percent
- Unit
- %
- Category
- knowledge
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Solar Pro 2 column; official language benchmark table image
Hae-Rae 1.0 (Show measurement, test conditions, and source)
- Source value
- 86.22
- Score
- 86.22
- Metric
- percent
- Unit
- %
- Category
- knowledge
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. [R, Reasoning] column; official language benchmark table image
Hae-Rae 1.0 (Show measurement, test conditions, and source)
- Source value
- 86.22
- Score
- 86.22
- Metric
- percent
- Unit
- %
- Category
- knowledge
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Solar Pro 2 column; official language benchmark table image
Ko-IFEval (Show measurement, test conditions, and source)
- Source value
- 86.52
- Score
- 86.52
- Metric
- percent
- Unit
- %
- Category
- instruction
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. [R, Reasoning] column; official language benchmark table image
Ko-IFEval (Show measurement, test conditions, and source)
- Source value
- 86.14
- Score
- 86.14
- Metric
- percent
- Unit
- %
- Category
- instruction
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Solar Pro 2 column; official language benchmark table image
Ko-MT-Bench (Show measurement, test conditions, and source)
- Source value
- 88.57
- Score
- 88.57
- Metric
- percent
- Unit
- %
- Category
- preference
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. [R, Reasoning] column; official language benchmark table image
Ko-MT-Bench (Show measurement, test conditions, and source)
- Source value
- 89.06
- Score
- 89.06
- Metric
- percent
- Unit
- %
- Category
- preference
- Direction
- Higher is better
- Source type
- vendor-reported
- Evaluator
- Upstage Solar Pro 2 official benchmark tables
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Solar Pro 2 column; official language benchmark table image
Page 1 of 4
Popularity
27.5 / 100
Predecessor and successor
Sources and data date
| Type | Evidence and data date |
|---|---|
| Price | Base API prices without caching or batch discounts. Higher context tiers and other rates are listed under Costs. |
| Research status | Research date September 8, 2026. 5 source URLs checked. This documents the inspected sources, not an exhaustive inventory of every publication. |
| Not found in the inspected sources | active-parameters-billions Original wording No exact value located in the checked primary model card/API documentation. |
| Not found in the inspected sources | knowledge-cutoff Original wording No exact value located in the checked primary model card/API documentation. |
| Unresolved | AA benchmark rows Original wording No exact Artificial Analysis model page located in the checked public sitemap. |
| Additional source | Model metadata (retrieved September 8, 2026) · Upstage Solar Pro 2 launch · Editorial description reviewed October 2, 2026 |
| Additional source | Upstage Solar Pro 3 release · Editorial description reviewed October 2, 2026 |
| Additional source | OpenRouter: Popularity index (derived), CC BY 4.0 |
| Additional source | Vercel AI Gateway: Popularity index (derived), CC BY 4.0 |
| Additional source | Creative Commons Attribution 4.0 |