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Specs

Model IDupstage/solar-pro4
Context window524K tokens
Max output131K tokens
Input price$0.15 / 1M tokens
Output price$0.60 / 1M tokens
Inputs → outputsText → Text
Open weightsNo

How to use Solar Pro 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-pro4:

curl https://openrouter.ai/api/v1/chat/completions \ -H "Authorization: Bearer $OPENROUTER_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "upstage/solar-pro4", "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.

More models from Upstage

Upstage: Solar Mini 4Upstage

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...

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Solar Pro 3Upstage

Solar Pro 3 is Upstage's powerful Mixture-of-Experts (MoE) language model. With 102B total parameters and 12B active parameters per forward pass, it delivers exceptional performance while maintaining computational efficiency. Optimized...

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Questions about Solar Pro 4

What is Solar Pro 4?

Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in office productivity, document-intensive...

How big is the context window of Solar Pro 4?

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

How much does Solar Pro 4 cost?

Through OpenRouter, Solar Pro 4 costs about $0.15 / 1M tokens for input and $0.60 / 1M tokens for output. Prices change, so check before large jobs.

Is Solar Pro 4 open source?

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

What can Solar Pro 4 take as input?

Solar Pro 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 10 Aug 2026.

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