---
title: Upstage: Solar Pro 3 — Reasoning LLM | ModelsLab
description: Access Upstage: Solar Pro 3 API for superior reasoning and instruction following. Generate accurate responses with 102B MoE parameters. Try now.
url: https://modelslab.com/upstage-solar-pro-3
canonical: https://modelslab.com/upstage-solar-pro-3
type: website
component: Seo/ModelPage
generated_at: 2026-04-15T04:01:40.658106Z
---

Available now on ModelsLab · Language Model

Upstage: Solar Pro 3
Reason Deeper. Scale Effortlessly
---

[Try Upstage: Solar Pro 3](/models/open_router/upstage-solar-pro-3) [API Documentation](https://docs.modelslab.com)

Deploy Production Reasoning Now
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MoE Architecture

### 102B Parameters Active 12B

Tripled scale over Solar Pro 2 delivers 30% reasoning gains without TPS or cost increase.

Instruction Following

### 52% IFBench Improvement

Excels in multi-step tasks and user intent capture for Korean and English queries.

Enterprise Ready

### Same Latency Costs

Retains Solar Pro 2 efficiency for complex agent workflows and production stability.

Examples

See what Upstage: Solar Pro 3 can create
---

Copy any prompt below and try it yourself in the [playground](/models/open_router/upstage-solar-pro-3).

Logic Puzzle

“Solve this step-by-step: Three houses in a row, labeled A B C. A has red door, B blue, C green. Owners: Smith likes cats, Jones dogs, Lee birds. Smith not in green. Dogs not next to birds. Who owns birds?”

Math Proof

“Prove by induction: Sum of first n even numbers equals n(n+1). Show base case, assume for k, prove for k+1. Explain each step clearly.”

Code Debug

“Fix this Python function that sorts list but fails on duplicates: def sort\_unique(lst): return sorted(set(lst)). Add tests for \[1,2,2,3\] expecting \[1,2,3\]. Preserve order where possible.”

Strategy Plan

“Outline 5-step plan to launch AI agent for customer support. Include reasoning for each step, metrics for success, and edge cases like multilingual queries.”

For Developers

A few lines of code.
Reasoning LLM. One Call.
---

ModelsLab handles the infrastructure: fast inference, auto-scaling, and a developer-friendly API. No GPU management needed.

- **Serverless:** scales to zero, scales to millions
- **Pay per token,** no minimums
- **Python and JavaScript SDKs,** plus REST API

[API Documentation ](https://docs.modelslab.com)

PythonJavaScriptcURL

Copy

```
<code>import requests

response = requests.post(
    "https://modelslab.com/api/v7/llm/chat/completions",
    json={
  "key": "YOUR_API_KEY",
  "prompt": "",
  "model_id": ""
}
)
print(response.json())</code>
```

FAQ

Common questions about Upstage: Solar Pro 3
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[Read the docs ](https://docs.modelslab.com)

### What is Upstage: Solar Pro 3?

### How does Upstage Solar Pro 3 API compare?

### Is Upstage: Solar Pro 3 model good for reasoning?

### Upstage Solar Pro 3 alternative to what?

### Upstage: Solar Pro 3 LLM multilingual?

### Upstage Solar Pro 3 API pricing details?

Ready to create?
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Start generating with Upstage: Solar Pro 3 on ModelsLab.

[Try Upstage: Solar Pro 3](/models/open_router/upstage-solar-pro-3) [API Documentation](https://docs.modelslab.com)

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*This markdown version is optimized for AI agents and LLMs.*

**Links:**
- [Website](https://modelslab.com)
- [API Documentation](https://docs.modelslab.com)
- [Blog](https://modelslab.com/blog)

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*Generated by ModelsLab - 2026-04-15*