Solar Pro 4
Upstage’s reasoning model for long, document-heavy and agentic work.
Solar Pro 4 is Upstage’s larger language model, built for long agent tasks, office productivity and document-heavy work.
- Provider
- Upstage
- Type
- Language model
- Released
- Aug 10, 2026
- Input
- text
- Output
- text
- Open weights
- No
Best for
- Agents
- Long context
- Extraction & classification
- Enterprise
Strengths
- Document-heavy tasks
- Agentic workflows
More from Upstage
- Solar Mini 4 — Upstage. Upstage’s compact 35B MoE (3B active) for fast agentic work.
- Solar Decide — Upstage. Upstage’s structured decision endpoint built on Solar Mini 4.