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Specs

Model IDupstage/solar-mini4
Context window524K tokens
Inputs → outputsText → Text
Open weightsNo

How to use Upstage: Solar Mini 4 in your app

The quickest way is through an API gateway such as OpenRouter, which uses the same format as the OpenAI API. Create a key, then send a request with the model ID upstage/solar-mini4:

curl https://openrouter.ai/api/v1/chat/completions \ -H "Authorization: Bearer $OPENROUTER_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "upstage/solar-mini4", "messages": [{"role": "user", "content": "Explain this in simple words..."}] }'

Prefer no code? Many tools in our AI tools directory run on models like this one.

Questions about Upstage: Solar Mini 4

What is 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. It is built for agentic use cases where response...

How big is the context window of Upstage: Solar Mini 4?

Upstage: Solar Mini 4 can read up to 524,288 tokens in one request, roughly 393,216 words.

Is Upstage: Solar Mini 4 open source?

Upstage: Solar Mini 4 does not have downloadable weights. You use it through Upstage or an API provider.

What can Upstage: Solar Mini 4 take as input?

Upstage: Solar Mini 4 accepts text and produces text.

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Specs and prices come from OpenRouter and the provider, and are refreshed daily. Last checked 23 Sep 2026.

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