How much does the Upstage API cost?

Upstage models cost from $0.07 to $0.22 per 1M input tokens through YepAPI. The cheapest is Solar Mini 4 ($0.07 in / $0.30 out per 1M). You pay per request with no monthly fee.

How do I get a Upstage API key?

Sign up at yepapi.com (about 30 seconds), open the dashboard and create an API key. The one key works for all 2 Upstage models and 283 models from other providers — no separate Upstage account.

What is the cheapest Upstage model?

Solar Mini 4 — $0.07 in / $0.30 out per 1M.

Which Upstage model has the largest context window?

Solar Pro 4, with 524K tokens of context.

Can I use the Upstage API with the OpenAI SDK?

Yes. Set the base URL to https://api.yepapi.com/v1/ai, use your YepAPI key, and pass the Upstage model ID (for example "upstage/solar-pro4").

AI API/Upstage

Upstage API pricing & API key

Every Upstage model on one page: 2 models, from $0.07 to $0.22 per 1M input tokens. Get one Upstage API key from YepAPI and pay per request — no subscription, no Upstage account or waitlist.

Get API Key

Takes 30 seconds.

Upstage API pricing (2 models)

YepAPI prices per 1M tokens (text) or per output (media), cheapest first. Updated October 23, 2026.

Model	Input / 1M	Output / 1M	Context
Solar Mini 4	$0.07	$0.30	524K
Solar Pro 4	$0.22	$0.89	524K

All Upstage models

Solar Pro 4

Text Generation

Access Solar Pro 4 through one API key. Upstage Cost-Efficient Long-Horizon LLM.

524K ctx$0.22/M in

Solar Mini 4

Text Generation

Access Solar Mini 4 through one API key. Upstage Compact 35B MoE.

524K ctx$0.07/M in

Start using Upstage models in 30 seconds

Pay as you go, no subscriptions.

Get API Key

Upstage API through YepAPI

YepAPI provides access to Upstage models through a unified API endpoint. Instead of managing a separate Upstage API key and billing account, use your single YepAPI key to call any Upstage model alongside 283 other AI models from OpenAI, Anthropic, Google, Meta, and more.

All Upstage models use the same OpenAI-compatible request format. Switch between models by changing the model parameter — no SDK changes, no code rewrites. Pay per token with no monthly minimums.

How to get a Upstage API key

Sign up at yepapi.com with Google or email — about 30 seconds.
Open the dashboard and create an API key (it starts with yep_sk_).
Call any Upstage model with that key — the OpenAI-compatible /v1/ai/chat/completions endpoint for text models.
Top up any amount; usage is billed per request.

Upstage API FAQ

How much does the Upstage API cost?: Upstage models cost from $0.07 to $0.22 per 1M input tokens through YepAPI. The cheapest is Solar Mini 4 ($0.07 in / $0.30 out per 1M). You pay per request with no monthly fee.
How do I get a Upstage API key?: Sign up at yepapi.com (about 30 seconds), open the dashboard and create an API key. The one key works for all 2 Upstage models and 283 models from other providers — no separate Upstage account.
What is the cheapest Upstage model?: Solar Mini 4 — $0.07 in / $0.30 out per 1M.
Which Upstage model has the largest context window?: Solar Pro 4, with 524K tokens of context.
Can I use the Upstage API with the OpenAI SDK?: Yes. Set the base URL to https://api.yepapi.com/v1/ai, use your YepAPI key, and pass the Upstage model ID (for example "upstage/solar-pro4").

Ready to use Upstage models?

2 Upstage models included with one API key.

Get API Key