upstage

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.

Quality Score
99/100
price + capability + benchmarks
Input Price
$0.03
per 1M tokens
Output Price
$0.12
per 1M tokens
Context Window
524,288
tokens

Benchmark results

Independent, published benchmarks. Blended score 70.2 across 3 benchmarks, last refreshed 2026-08-13. How scoring works →

BenchmarkMeasuresScore
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 →

JobTokensCost
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 →

#CategoryScore
#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.