# Solar Pro

> Solar Pro, a family of models by Upstage, listed from OpenRouter. Indexed, not reviewed: facts and our own checks, no score or ranking. 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…

- Canonical: https://www.anchorterminal.com/tools/solar-pro
- Markdown: https://www.anchorterminal.com/tools/solar-pro.md (~500 tokens)
- Slim: https://www.anchorterminal.com/tools/solar-pro.min.md (~430 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/tools/solar-pro.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-04

# Solar Pro

> Indexed, not reviewed: facts from OpenRouter and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: model family, by Upstage
- Category: Model APIs & inference (https://www.anchorterminal.com/categories/inference.md)
- Listed because: OpenRouter lists it, with prices from the providers that serve it.
- What OpenRouter says: 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...

## Models (2)

| Model | OpenRouter id | Released | Context | Input $/1M | Output $/1M | Supports |
| --- | --- | --- | --- | --- | --- | --- |
| Solar Pro 4 | `upstage/solar-pro4` | 2026-08 | 524k | $0.09 | $0.36 | tools, structured output, reasoning, caching |
| Solar Pro 3 | `upstage/solar-pro-3` | 2026-01 | 131k | $0.15 | $0.60 | tools, structured output, reasoning, caching |

Prices and limits as OpenRouter lists them; a provider's own price can differ.

- JSON: https://www.anchorterminal.com/api/v1/tools/solar-pro.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming