Upstage Solar (솔라)

Name: Upstage Solar (솔라)
Brand: Upstage (업스테이지)

Upstage (업스테이지), South Korea, console.upstage.ai

An agent-oriented LLM API from Upstage that is strong in Korean. Solar Pro 4 launched in August 2026, and Solar Mini 4 and the decision-only Solar Decide (beta) in September

Developer API

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CurrencyUSD KRW EUR

Personal starting priceCheck siteNo paid plan

Free tierPaid only

Korean supportGood

Price checked 2026-10-17, source: upstage.ai/pricing. Prices and benefits may change. Check the official site before you pay.

Pros

Official support for Korean, English and Japanese
512K long context, up to 128K output
API input is not used for training and on-premises deployment is possible
Enterprise tools such as document parsing and OCR in one place

Cons

No chat app for general users (API only)
Parameter count not disclosed
The existing Solar Pro 3, Pro 2 and Mini end on October 30, so migration is needed
Promotional prices change often

These are opinions compiled by Pickx from public sources.

At a glance

Upstage Solar is an LLM series made by the Korean AI company Upstage, used by developers and companies through an API. On August 6, 2026 it released the flagship Solar Pro 4, specialized for agent tasks, and on September 22 it released the cheap lightweight model Solar Mini 4 and the decision model Solar Decide (beta), which returns only choices, scores or yes/no probabilities instead of text. It is strong in Korean understanding and works well with enterprise tools such as document parsing.

Full model list

Model	Type	Features	Plans that can use it
Solar Pro 4	Flagship LLM	Released 2026-08-06 512K context up to 128K output reasoning mode tool calling structured output Korean/English/Japanese	API pay-as-you-go commitment Enterprise (on-premises)
Solar Mini 4	Lightweight LLM	Released 2026-09-22 512K context cheap model for agents	API pay-as-you-go commitment Enterprise
Solar Decide (beta)	Decision (classification/selection/scoring) model	Released 2026-09-22 does not write text returns only a choice, a score, or yes/no with calibrated probability	API pay-as-you-go
Document Parse OCR Information Extract	Document processing	Converts PDF/image documents so AI can read them extracts key information	API pay-as-you-go
Embed 2	Embedding	Embeddings for search the existing Embed ends on 2026-12-31	API pay-as-you-go

Plans

Plan	Price	What you can do	Usage limit	Features
API pay-as-you-go	Solar Pro 4 $0.30/$1.20 Solar Mini 4 $0.10/$0.40 Solar Decide $0.10/output free (input/output per 1 million tokens, excl. 10% VAT)	Call via console/Playground/API prepaid credits by credit card	Official limits not disclosed	Launch promotion running Solar Pro 4: $0.15/$0.60 from October 20 Solar Mini 4: 50% off until October 22
Commitment plan	$100 or more per month, or annual	Bonus credits when you prepay a commitment	Bonus credits up to +40%	For teams with steady usage
Enterprise	Inquire	Custom contract on-premises deployment	Official limits not disclosed	For security-sensitive companies

Who should choose this plan

API pay-as-you-go: Development teams building Korean customer support, document summaries and internal agents who need a model that is cheaper than overseas models and strong in Korean.
Solar Decide: Automation that runs short decisions in large volumes, such as inquiry classification or policy violation detection.
Enterprise: Financial and public institutions that cannot send data outside and need an on-premises installation.
It is not suitable for general users looking for a chat app they can talk to right away.

Notes

Information checked on: 2026-10-13
Schools, hospitals and nonprofits can use Solar Pro and Document Parse free for up to 1 year through the AWS AI support program (eligibility review applies).
Sources: Upstage pricing page, Upstage model list, Model release history, Solar Decide documentation

Good for

FAQ

Can I use Upstage Solar (솔라) for free?

No, it is paid only.

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Prices converted at 1 USD = ₩1,327.84 (2026-10-20). Original price shown in brackets. Taxes as listed by each provider.