Upstage: Solar Mini 4

Solar Mini 4 is Upstage's compact, cost-efficient language model, a 35B-parameter mixture-of-experts with 3B active parameters and a 524K context window.

Context
524K
Max output
131K
Input price
$0.05/1M tokens
Output price
$0.2/1M tokens

Capabilities

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

Details

Model IDupstage/solar-mini4
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
$0.05
Output
$0.2
Cache write
—
Cache read
$0.01
Batch in
—
Batch out
—

API

GET/v1/models/openrouter/upstage/solar-mini4

Upstage: Solar Mini 4

upstage/solar-mini4

Solar Mini 4 is Upstage's compact, cost-efficient language model, a 35B-parameter mixture-of-experts with 3B active parameters and a 524K context window.

Changes · 2 entries
upstage/solar-mini4createca7a400Nov 2, 2026, 03:02 AM
upstage/solar-mini4create118451aSep 24, 2026, 07:08 AM