Solar is a lightweight model family specialized for agentic work.
This page is the starting point for building with Solar. Follow the sections below in order, or jump straight to what you need.
Quick Start
Make your first call and see Solar respond.
Choose a model
Find the model that fits your task and your budget.
Build
Add the capabilities your application needs.
Manage and operate
Monitor usage, control costs, and keep your application reliable.
Counting Tokens
Estimate token usage before sending a request.
Dashboard
Track actual usage and spending for your account.
Rate Limits
Know your request and token limits, and how to handle them.
Error Codes
Look up API error codes and what to do about them.
FAQ
Find answers to common questions about building with Solar.
Jobs
Run Studio agents on uploaded files, control how much step history is returned with the include parameter, and read job results from output_text and additional_values.
API Quickstart
Make your first Solar API call with Upstage. Choose a model alias, send single-turn and multi-turn requests, and get a response in minutes.