Upstage: Solar Pro 4
Upstage: Solar Pro 4, from upstage, is designed for handling text-based tasks with a vast context length of 524,288 tokens and supports reasoning and tools integration. It excels in AI Index Coding but lags in agentic abilities, as reflected by its benchmark scores. This model should be considered for projects requiring extensive text analysis and where tool integration could enhance functionality. With a blended benchmark score of 70.2 across three benchmarks, it stands as a solid choice despite limitations in certain areas. Its pricing at $0.03 per input token and $0.12 per output token makes it accessible for budget-conscious users while still offering robust capabilities.
Benchmark results
Independent, published benchmarks. Blended score 70.2 across 3 benchmarks, last refreshed 2026-08-13. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 68.7 |
| AI Index Coding | software engineering tasks | 87.0 |
| AI Index Agentic | multi-step tool-using tasks | 55.5 |
- Model ID
- upstage/solar-pro4
- Vendor
- upstage
- Released
- August 2026
- Tokenizer
- Other
- Input Modalities
- text
- Output Modalities
- text
- Max Output
- 131,072 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- text only
- Audio
- no
- Moderated
- no
What it costs in practice
Computed from the current $0.03/M input and $0.12/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | under $0.01 |
| Classify 1,000 customer emails | 500k in / 50k out | $0.02 |
| A month of a busy support chatbot | 5M in / 2M out | $0.39 |
Category rankings
Where Upstage: Solar Pro 4 places across the 14 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #7 | Bulk Data LabelingData · of 25 ranked | 134 |
| #7 | Customer SupportBusiness · of 25 ranked | 133 |
| #11 | Short-Form SummarizationWriting · of 25 ranked | 130 |
| #11 | Email DraftingWriting · of 25 ranked | 126 |
| #11 | Language LearningEducation · of 25 ranked | 126 |
| #11 | Chat CompanionPersonal · of 25 ranked | 130 |
| #13 | Dataset AnnotationResearch · of 25 ranked | 143 |
| #15 | Code CompletionCode · of 25 ranked | 133 |
| #15 | Trivia & General KnowledgePersonal · of 25 ranked | 120 |
| #15 | Self-Hosted / LocalCost · of 25 ranked | 117 |
| #17 | JSON ExtractionData · of 25 ranked | 146 |
| #18 | Cheap Bulk InferenceCost · of 25 ranked | 137 |
| #24 | Social Media PostsWriting · of 25 ranked | 119 |
| #24 | Voice Assistant BackendVoice · of 25 ranked | 123 |
Similar models
Quick answers
- How much does Upstage: Solar Pro 4 cost?
- $0.03 per million input tokens and $0.12 per million output tokens.
- What is Upstage: Solar Pro 4's context window?
- 524,288 tokens, roughly 786 pages of text in a single request.
- Does Upstage: Solar Pro 4 support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can Upstage: Solar Pro 4 process images?
- No, it is text-only on the input side.