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
$0.15/1M tokens
Output price
$0.6/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode

Details

Model IDupstage/solar-pro4
Provider OpenRouter
Creator upstage
Family—
License—
Status—
Type—
Input modalitiestext
Output modalitiestext
Open weight—
Parameters—
Architecture—
Context window524K tokens
Max input—
Max output131K tokens
Reasoning tokens—
Knowledge cutoff—
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$0.15
Output
$0.6
Cache write
—
Cache read
$0.03
Batch in
—
Batch out
—

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 · 5 entries
upstage/solar-pro4createca7a400Nov 2, 2026, 03:02 AM
upstage/solar-pro4update42a9895Oct 20, 2026, 06:39 AM
pricinginput$0.09→$0.15output$0.36→$0.6cached input$0.018→$0.03
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