Solar Pro 4
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.
Model by Upstage
Install
Pick your client. Read the repository before you give any tool access to your data.
{
"model": "upstage/solar-pro4",
"baseURL": "https://openrouter.ai/api/v1"
}OpenAI-compatible API: point any OpenAI SDK at the base URL and use this model id.
Settings it needs
OPENROUTER_API_KEYrequiredsecret
Get the weekly diff
The weekly diff: one email a week with new agent tools, notable updates and grade changes, plus security alerts for tools you follow. Double opt-in, one-click unsubscribe.
About
Use cases: document-processing, model-inference
Reviews
Write a reviewNo reviews yet. Installed it? Reviews come from verified installers only. How reviews work
Price and limits
| Variant | Input $/M tokens | Output $/M tokens | Cached input $/M |
|---|---|---|---|
| Standard | $0.15 | $0.6 | $0.03 |
Price as of Oct 26, 2026 from OpenRouter. Prices change often; check before you rely on one.
- Provider
- Upstage
- Model id
upstage/solar-pro4- Context window
- 524,288 tokens (524K)
- Max output
- 131,072 tokens
- Input
- text
- Output
- text
- Tool calling
- Yes
- Structured outputs
- Yes
- Reasoning
- Yes
- Weights
- Closed
- Released
- Aug 10, 2026
Details
- Auth
- API key
- License
- Proprietary
- First seen
- Oct 24, 2026
- Last checked
- Oct 26, 2026
- Source
- OpenRouter
More from Upstage
- 0.582score
Solar Pro 3
Upstage
Solar Pro 3 is Upstage's powerful Mixture-of-Experts (MoE) language model.
ModelAFreshness: A$0.15 / $0.6131K ctx - 0.582score
Solar Mini 4
Upstage
Solar Mini 4 is Upstage's compact, cost-efficient language model, a 35B-parameter mixture-of-experts with 3B active parameters and a 524K context window.
ModelAFreshness: A$0.05 / $0.2524K ctx
Cite this page
Solar Pro 4: price, context window, tool use. Agent Mart. https://agentmart.dev/models/upstage-solar-pro4 (last updated 2026-10-26)