Upstage: Solar Pro 4

Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.

Context
524K
Max output
131K
Input price
$0.09/1M tokens
Output price
$0.36/1M tokens

Capabilities

vision
tool call
structured output
reasoning
json mode
streaming
fine tuning
batch

Details

Model IDupstage/solar-pro4
Provider OpenRouter
Creator upstage
Family—
License—
Parameters—
Status—
Input modalitiestext
Output modalitiestext
Architecture—
Knowledge cutoff—
Training data cutoff—
Release date
Deprecation date—
Type—
Reasoning tokens—
Max input—
Open weight—
Sourceofficial
Last updated

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$0.09
↑200%$0.03
Output
$0.36
↑200%$0.12
Cache write
—
Cache read
$0.02
↑200%$0.01
Batch in
—
Batch out
—
Price history · $/1M input
$0.03
$0.09
Aug 13Sep 11
DateInputOutputCache readChange
Aug 13, 2026$0.03$0.12$0.006—
Sep 11, 202617bcfbf$0.09$0.36$0.018↑200%

Input is ↑200% since Aug 13, 2026, from $0.03 to $0.09 per 1M tokens.

API

GET/v1/models/openrouter/upstage/solar-pro4

Upstage: Solar Pro 4

upstage/solar-pro4

Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.

Changes · 3 entries
upstage/solar-pro4update17bcfbfSep 11, 2026, 06:36 AM
pricinginput$0.03→$0.09output$0.12→$0.36cached input$0.006→$0.018
upstage/solar-pro4updatebe35184Aug 17, 2026, 04:02 AM
descriptionSolar Pro 4 is a large language model from Upstage.→Solar Pro 4 is Upstage's cost-efficient large language mo...
upstage/solar-pro4create3cddff5Aug 13, 2026, 02:54 AM