Solar Pro 4
Solar Pro 4 is a large language model from Upstage. It is suited for agentic workflows, office productivity, document-intensive work, and coding.
Specifications
| Lab | Upstage |
|---|---|
| Context window | 524.3K tokens |
| Input price | $0.09/1M |
| Output price | $0.36/1M |
| Release | Aug 2026 |
Strengths
- 512K-token context window for long documents
- Low input pricing for cost-sensitive production workloads
- Tool-use support for agentic workflows
- Structured output support for reliable application integration
Weaknesses
- Newer listing with limited independent benchmark coverage
- Text-only inputs limit multimodal application coverage
Best for
- Agentic workflows and tool-using applications
- Long-context document and codebase processing
In Depth: Solar Pro 4
Summary
Solar Pro 4 is an AI model from Upstage.
Released in Aug 2026. It takes text input and produces text output, with a context window of 524.3K tokens. Input pricing is $0.09 per 1M tokens and output is $0.36 per 1M tokens on OpenRouter.