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Upstage: Solar Pro 4.

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Cheapest input
$0.03/M
on OpenRouter
Cheapest output
$0.12/M
on OpenRouter
Hosted equiv.
~$0.04/hr
@ 100 tok/s on OpenRouter

Solar Pro 4 is a large language model from Upstage. It is suited for agentic workflows, office productivity, document-intensive work, and coding.

Hosted API only

No self-host path — closed weights.

Upstage: Solar Pro 4's weights aren't published. Use it via the access providers below.

Where to use it

Cheapest hosted endpoints.

Provider Access $/M in $/M out
OpenRouter api aggregator $0.03 $0.12 Launch ↗
FAQ

Frequently asked.

How do I run Upstage: Solar Pro 4?
Upstage: Solar Pro 4 is a closed-source API model. The cheapest way to access it is through the API providers listed on this page (direct API, aggregators, and hosted chat UIs).
Where can I access Upstage: Solar Pro 4?
Upstage: Solar Pro 4 is available via OpenRouter. Each access option lists its own pricing (per million tokens or hourly hosting).
How much does it cost to run Upstage: Solar Pro 4?
API pricing starts at $0.03/M input tokens and $0.12/M output tokens. Self-hosting cost depends on the GPU you rent — see the Run It Yourself tab.
Is Upstage: Solar Pro 4 open-source or proprietary?
Upstage: Solar Pro 4 is a proprietary model from Upstage. Access is API-only — there are no public weights to download.