AI model · Upstage
Solar Pro 4
Model ID: upstage/solar-pro4
- Input
- $0.09 per 1M tokens
- Output
- $0.36 per 1M tokens
- Context
- 524K tokens at once
- Max output
- 131K tokens per reply
- Released
- 10 Aug 2026 Upstage
What it can do
- YesReasoning
- YesTool calling
- NoImage input
- NoOpen weights
- NoFree to use
Takes text; gives text.
How its listing describes it
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...
Sources
- Upstage: Solar Pro 4 on OpenRouter — read 2 Oct 2026