Solar Pro 3
VerifiedPowerful closed LLM built for extended text context handling.
About Solar Pro 3
Solar Pro 3 employs an advanced transformer-based design optimized for text inputs. Its 128000-token context window enables processing of lengthy documents and multi-turn dialogues without truncation. Upstage maintains full control as the model is not released as open weights.
Strengths center on coherence across extended sequences and consistent output quality. The text modality keeps the system focused on language tasks without multimodal overhead. This setup suits scenarios demanding sustained context awareness.
Common applications include document summarization, technical writing assistance, and complex question answering. Teams access the model through managed APIs for integration into business workflows. Its closed nature supports regular updates and enterprise-grade reliability.
Capabilities
How Solar Pro 3 compares
Solar Pro 3 (striped bar) vs other language models on intelligence, speed and price.
Price
USD per 1M output tokens · Lower is better · Solar Pro 3 ranks #29 of 78
Sources: Artificial Analysis (intelligence, speed) · OpenRouter (price).
Best for
Long Document Analysis
Solar Pro 3 excels at logical reasoning over documents up to 128k tokens, making it suitable for reviewing lengthy legal contracts or research reports and extracting key insights.
Comprehensive Content Summarization
The model handles content summarization of extensive texts such as books or technical manuals while preserving context and accuracy across the full input.
Complex Question Answering
It supports question answering that requires cross-referencing multiple sections in large datasets, ideal for enterprise knowledge base queries or multi-document analysis.
Strengths & limitations
Strengths
- +Strong handling of extended text inputs
- +Efficient text-only processing
- +Versatile for language tasks
Limitations
- –Text modality only
- –No vision or multimodal support
- –Performance depends on training data quality
Cost calculator
Estimate what Solar Pro 3 would cost for your usage.
Based on Solar Pro 3's $0.15/1M input · $0.60/1M output. Estimate only — actual cost varies by provider and caching.
Quick start
OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. Only the model slug changes between models.
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://openrouter.ai/api/v1",
apiKey: process.env.OPENROUTER_API_KEY,
});
const completion = await client.chat.completions.create({
model: "upstage/solar-pro-3",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(completion.choices[0].message.content);Model slug: upstage/solar-pro-3
Editor's verdict
Solar Pro 3 is Upstage's proprietary language models with a 128K-token context window.
At $0.60 per 1M output tokens, it is very cost-efficient for its class.
It is available through Upstage's API and aggregators like OpenRouter.
Best suited to strong handling of extended text inputs and efficient text-only processing.
Frequently asked questions
Solar Pro 3 supports a context window of 128000 tokens.
User reviews
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