Upstage: Solar Pro 4
Analysis Summary
Solar Pro 4 is Upstage's cost-focused model with a 524K context window, strong measured coding capability, and support for tools and function calling. Input and output pricing are exceptionally low, making it practical for repeated API workloads without sacrificing the context needed for large briefs or code repositories.
The model fits software maintenance, structured SEO production, document transformation, and agent workflows with bounded complexity. Its reasoning capability is clearly below frontier flagships, and the agentic measurement is more moderate, so high-stakes strategy, open-ended planning, and delicate client communications deserve stronger review or escalation.
Adopt Solar Pro 4 as a volume engineering and automation model, particularly when context capacity and cost efficiency matter more than maximum reasoning depth.
Assessed September 7, 2026
Editorial notes
Solar Pro 4 pairs strong coding with a 524K context window, tool use, and function calling at exceptionally low pricing. Its general reasoning is below flagship level, but it is a compelling engineering and high-volume automation choice.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
Solar Pro 4 pairs strong coding with a 524K context window, tool use, and function calling at exceptionally low pricing. Its general reasoning is below flagship level, but it is a compelling engineering and high-volume automation choice.
How Upstage: Solar Pro 4 compares
Upstage: Solar Pro 4 ranks #75 of 438 AI models we track for overall intelligence, #68 of 210 for coding, #48 of 192 for agentic tasks. Its 524K-token context window is larger than 76% of the models we list. At $0.09 per million input tokens it is cheaper than 70% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Strongest on value. The pulled-in intelligence corner is the trade-off, and if the shape matters more than the price, this is your model.
Compare shapes side-by-side →Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.09 | $0.000090 |
| Output | $0.36 | $0.000360 |
What would Upstage: Solar Pro 4 cost your business?
Pick the job that looks most like yours, then fine-tune with the sliders. Estimates update live.
A website chatbot handling around 100 customer conversations a day, a few short messages each.
Full calculator with 779 models → Price Calculator
These numbers get smaller with the right architecture.
We route routine calls to cheap models and save Upstage: Solar Pro 4 for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamAbout Upstage: Solar Pro 4
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in office productivity, document-intensive..
Frequently asked questions about Upstage: Solar Pro 4
How much does Upstage: Solar Pro 4 cost?
Upstage: Solar Pro 4 costs $0.09 per million input tokens and $0.36 per million output tokens.
What is the context window of Upstage: Solar Pro 4?
Upstage: Solar Pro 4 has a context window of 524,288 tokens (524K).
Is Upstage: Solar Pro 4 good for coding?
On our coding benchmark index, Upstage: Solar Pro 4 ranks #68 of 210 models, placing it in the broader range of the field for code generation and debugging.
What can Upstage: Solar Pro 4 do?
Upstage: Solar Pro 4 supports tool use and function calling.
Who created Upstage: Solar Pro 4?
Upstage: Solar Pro 4 is developed by Upstage and was released on August 10, 2026.