Solar Pro 4 is Upstage's language model with a 524K context window and up to 131K output tokens, starting at $0.09 / 1M input and $0.36 / 1M output. A large language model from Upstage suited for agentic workflows, office productivity, document-intensive work, and coding.
Specifications
Canonical IDupstage-solar-4-pro
TypeLanguage
StatusActive
CreatorUpstageUpstage
Providers
Context Window524K tokens
Max Output131K tokens
Input ModalitiesText
Output ModalitiesText
Reasoning Effortsdefault
Release Date · 2 months ago
Benchmarks
Intelligence Index
#97
Coding Index
#62
GPQA
#58
HLE
#95
Time to First Token
#498
SciCode
#104
LCR
#106
Output TPS
#129

Capabilities

Input1/5
Text✓
Image·
Audio·
Video·
PDF·
Output1/5
Text✓
Image·
Audio·
Video·
Embedding·
Capabilities6/13
Reasoning✓
Adaptive Reasoning·
Function Calling✓
Parallel Function Calling✓
Structured Outputs✓
Native JSON Schema✓
Web Search·
URL Context·
Computer Use·
Code Execution·
File Search·
Prompt Caching✓
Assistant Prefill·

Pricing by Provider

US Dollar ($)
Per 1M tokens
ProviderStandard
Input
$ / 1M
Output
$ / 1M
Cache Read
$ / 1M
OpenRouter logo
OpenRouter
upstage/solar-pro4
$0.09$0.36$0.018

Cost Calculator

US Dollar ($)
Preset:

Versions

VersionReleasedContextInput / 1MOutput / 1MStatus
Solar Pro 4524K$0.090$0.360Current
Solar Pro 3131K$0.150$0.600Available
Solar Pro 2————Available
Solar Pro 2————Available
Solar Pro 2————Available
Solar Pro 2 Preview————Available
Solar Pro————Available

Other Models

ModelTierReleasedContextInput / 1MOutput / 1M
Solar Mini 4Mini524K$0.050$0.200
Solar Open2 250B—————
Solar Open 100B—————
Solar Large—————
Solar MiniMini————
Solar MiniMini————

Model IDs

openrouter/upstage/solar-pro4
solar-pro4
upstage-solar-4-pro
upstage/solar-pro4