ChatGPT vs Upstage Solar (솔라) comparison

ChatGPT and Upstage Solar (솔라) compared side by side in AI.

CurrencyUSDKRWEUR

What is different

Starting price

ChatGPT$8+
Upstage Solar (솔라)Check site

Free tier

ChatGPTFree plan available
Upstage Solar (솔라)Paid only

ChatGPT

The most widely used general-purpose AI chatbot. Chat, writing, coding, image generation and web search in one place

What is good

  • No. 1 in users, so plenty of guides and tips
  • Widest range of features
  • Polished app and voice chat

What could be better

  • Tight usage limits on the free plan
  • Top features need the expensive Pro plans

ChatGPT official site

Upstage Solar (솔라)

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

What is good

  • 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

What could be better

  • No chat app for general users (API only)
  • Parameter count not disclosed

Upstage Solar (솔라) official site

At a glance

ItemChatGPTVisit siteUpstage Solar (솔라)Visit site
Starting price$8+Official USD priceCheck siteNot applicable
Free tierFree plan availablePaid only
Korean supportGoodGood
Main models
  • GPT-6 (Sol)
  • GPT-6 Luna
  • GPT-6 Pro (Astra)
  • GPT-6.1 Sol
  • Image: ChatGPT Images 2.5
  • Solar Pro 4 (flagship)
  • Solar Mini 4 (lightweight)
  • Solar Decide (decision model, beta)
  • Document Parse
  • Embed 2 (Solar Pro 3/Pro 2/Mini end on 2026-10-30)
TypeAI servicesAI services
CategoryChatbot/Assistant, Image Generation, CodingDeveloper API
CompanyOpenAI, United StatesUpstage (업스테이지), South Korea
Plans
  • Free
  • Go $8
  • Plus $20
  • Pro $100/$200/$500
  • Business $25 (annual $20)
  • Enterprise/Edu
  • API pay-as-you-go (per 1 million tokens, excl. VAT): Solar Pro 4 list price input $0.30
  • output $1.20 (promotion $0.15/$0.60 from October 20), Solar Mini 4 list price input $0.10
  • output $0.40 (50% off until October 22), Solar Decide (beta) input $0.10, output free
  • Prepaid credits, commitment plan ($100+/mo), Enterprise by inquiry
Pros
  • No. 1 in users, so plenty of guides and tips
  • Widest range of features
  • Polished app and voice chat
  • 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
  • Tight usage limits on the free plan
  • Top features need the expensive Pro plans
  • 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

Prices and benefits may change. Check the official site before you pay.

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

Related comparisons

Add other services to compare