Upstage Solar Pro 4

Solar Pro 4 by Upstage excels in the Coding category, where it ranks #234 with a composite score of 40/100. Solar Pro 4 is a large language model from Upstage. It is suited for agentic workflows, office productivity, document-intensive work, and coding. It is particularly strong in areas highlighted by its top benchmark performance and adoption metrics, making it suitable for both individual developers and enterprise teams looking for a reliable coding solution.

Solar Pro 4 is priced at $0.03 per million input tokens and $0.12 per million output tokens (USD). Contact the provider for volume discounts and enterprise pricing. Pricing is competitive within the coding category and reflects the model's quality-to-cost ratio.

In the Coding category, Solar Pro 4 holds rank #234 out of 380 models tracked. Its quality rank is #234 and adoption rank is #234. You can use our comparison tool at /compare to see detailed side-by-side metrics with specific alternatives. Key differentiators include its composite scoring across benchmarks, community sentiment, and real-world adoption rates.

Solar Pro 4 has been evaluated across 5 different signals. Its strongest areas include Capabilities (67/100), Pricing (100/100), Context Window (91/100). These scores are derived from industry-standard benchmarks, community ratings, and real-world performance metrics. The composite score of 40/100 reflects a weighted combination of all tracked signals.

Solar Pro 4 is a paid model, though some providers may offer trial credits or limited free tiers for evaluation. Check Upstage's website for current free tier availability and promotional offers.

Solar Pro 4 supports a 524K token context window (524,288 tokens total). That translates to roughly 393,216 words in a single prompt. This is large enough to process entire codebases, research papers, or long conversation histories in one shot.

Solar Pro 4 can generate up to 131K output tokens (131,072 tokens) per response. That is roughly 98,304 words. This is enough for generating complete code files, detailed reports, or long-form content in a single response.

Solar Pro 4 supports function/tool calling, structured JSON output, extended reasoning/chain-of-thought, streaming responses. Function calling lets you integrate it with external APIs and tools programmatically. These capabilities determine which workflows and integrations the model can handle natively.

Solar Pro 4 was developed by Upstage. It was released on August 10, 2026. You can access it through Upstage's API. Check our provider page for all models from Upstage and how they compare against each other.

Pick Solar Pro 4 when you need a budget-friendly option for high-volume, simpler tasks where you prioritize cost over peak performance. If your task is straightforward text completion or classification, a cheaper model might give you 90% of the quality at a fraction of the price. Run a quick benchmark on your actual use case before committing.

You can access Solar Pro 4 through Upstage's API using standard HTTP requests or their official SDK. Most providers support OpenAI-compatible endpoints, so switching between models often requires changing just the model name in your API call. Streaming is supported for real-time token-by-token output. For production use, implement proper error handling, rate limiting, and cost monitoring.