Solar Pro 4
Solar Pro 4 is Upstage’s flagship model, released on August 6, 2026, built for agentic use and document-based work, coding and business tasks. It supports a 512K context, up to 128K output tokens and a reasoning mode. It is available through Upstage’s console and on-premises.
Released
August 6, 2026
Type
llm
License
proprietary
Context
—
The developer states a context window of “512K” tokens.
Pricing
Input
$0.15 / 1M tokens
Output
$0.60 / 1M tokens
List price on the developer's own pages, checked . Upstage’s price from October 20, 2026, with no end date. Until October 19 a 70% discount applies ($0.09 input / $0.36 output); the struck-through list price is $0.30 / $1.20. Cached input and VAT are extra.
Capabilities
Sources
Every figure on this page was checked against these pages on . A figure we could not source is left out.
- Upstage docs: Solar Pro 4 (opens in a new tab)
- Upstage API pricing (opens in a new tab)
- Upstage docs: Model history (opens in a new tab)
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