Upstage: Solar Pro 4

Upstage: Solar Pro 4

upstage · Released Aug 10, 2026
Intelligence #55 / 756
67.3 our score
Speed #203 / 333
73.5 tok/s
Input Price #235 / 779
$0.090 per 1M tokens
Output Price #282 / 779
$0.360 per 1M tokens
Context #188 / 779
524,288 tokens

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.

#55 of 756 overall

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.

Position in the field
Intelligence: smarter than 93% of models #55
Speed: faster than 39% of models #203
Price: cheaper than 70% of models #235
Context: larger than 76% of models #188
worst in fieldmedianbest in field
Price vs frontier peers · $ per 1M tokens
Upstage: Solar Pro 4 $0.09 in $0.36 out
OpenAI: GPT-6 Astra $10.00 in $50.00 out
Anthropic: Claude Fable 5.1 $10.00 in $50.00 out
Claude Opus 5 $5.00 in $25.00 out

Dark bar = input · light bar = output, scaled to the priciest peer.

Context window vs peers · tokens
Upstage: Solar Pro 4 524K

1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.

Intelligence4.7Technical5.5Value8.3Content7.3
Performance profile

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.

3,000
One request is one message, email, draft or automation call.
1,200 tokens

$0/mo Upstage: Solar Pro 4

Full calculator with 779 models → Price Calculator

DFO AI AUTOMATION

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 team

About 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.

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