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  1. Home
  2. Models
  3. Solar Pro 4
Updated Sep 22, 2026
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Openings

How Solar Pro 4 starts an answer

The first lines of 5 of its 9 written answers. Formatting stripped, words untouched.

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

1,851 words
As CEO, my overriding duty is to balance patient safety, legal/regulatory compliance, fiduciary responsibility, and long-term corporate survival. A 1-in-8,000 risk of liver failure is rare but severe, potentially fatal, and materially unexpected relative to the current label.
Read the full answer

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

1,638 words
The Premise: The 1920 Solid-State Breakthrough For this scenario to function, we must assume a functional point-contact or junction transistor is demonstrated in 1920 (perhaps by Lilienfeld or an early Bell Labs precursor), and crucially, that methods for purifying semiconductor materials (germanium/silicon) are solved…
Read the full answer

Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

1,598 words
This architecture contains several fundamental mismatches between real-time collaborative editing requirements and the chosen patterns. Below is a systematic breakdown of failure modes, race conditions, and scaling bottlenecks, each with a targeted solution and explicit trade-offs.
Read the full answer

Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

1,382 words
Disclaimer: I am an AI assistant and not an attorney. The following analysis is for informational purposes only and does not constitute legal advice. Contract laws vary significantly by jurisdiction (e.g., state, country).
Read the full answer

Explain Like I'm a Specific Expert

Explain how a large language model (like GPT or Claude) learns and generates text to each of these three audiences: 1. **An experienced…

1,062 words
The Experienced Software Engineer Think of the model not as a reasoning engine, but as a highly compressed, non-deterministic function approximator that maps a sequence of input tokens to a probability distribution over the next token.
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Compare Solar Pro 4

Solar Pro 4 vs Ox Alpha14 shared prompts · Landed Aug 2026
Solar Pro 4 vs MiniMax M314 shared prompts · Landed Jun 2026
Solar Pro 4 vs Mercury 2.514 shared prompts · Landed Sep 2026
Solar Pro 4 vs Ling 3.0 Flash Fin (free)14 shared prompts · Landed Sep 2026
Solar Pro 4 vs Ling 3.0 Flash Sante (free)14 shared prompts · Landed Sep 2026
Solar Pro 4 vs Ling 3.0 Flash VL (free)14 shared prompts · Landed Sep 2026
Solar Pro 4 vs Muse Spark 1.314 shared prompts · Landed Sep 2026
Solar Pro 4 vs Gemini 3.8 Flash14 shared prompts · Landed Sep 2026
Solar Pro 4 vs Muse Spark 1.3 Contributor14 shared prompts · Landed Sep 2026
Solar Pro 4 vs Grok 4.614 shared prompts · Landed Aug 2026
Solar Pro 4 vs Dots3-Note Preview14 shared prompts · Landed Aug 2026
Solar Pro 4 vs Seed 2.0 Code14 shared prompts · Landed Aug 2026

Prompts Solar Pro 4 answered

  • Historical Counterfactual Analysisreasoning
  • Startup Pitch Teardownreasoning
  • Advanced Investment Memo (IC Memo)financial modeling
  • Adversarial Contract Reviewreasoning
  • Debug This Architecturereasoning
  • Ethical Dilemma with Stakeholdersreasoning

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Solar Pro 4

Solar Pro 4

Upstage language model for long-horizon agent workflows, office productivity, and document-intensive tasks. Supports text input and output with a 524K context window on OpenRouter.

OpenRouterDocs
Provider
Upstage
Released
2026-08-10
Size
LARGE
Free API (OpenRouter)
No
Per 1M tokens
$0.09 in · $0.36 out
Rival’s tab
$0.02
14/14 receipts survived

Free API availability

No free endpoint for Solar Pro 4 was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 22 Sep 2026 · OpenRouter usage limits

View API options↗
Get API accessProvider and language code samples
Provider
fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"upstage/solar-pro4"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

Favorites

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Inception

20108.4
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War and Peace

Лев Толстой
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Paris

France
Tetris (1984)

Game

Tetris (1984)

Puzzle4.4

Model Responses

9 outputs · $0.01 tracked across 9 receipts

Workshop · 146 skills

A workflow for your next project.

Writing and research skills with working examples.

Explore $79Free sample

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