Upstage
Solar Pro 4
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.
At a glance
- Input / 1M
- $0.09
- Output / 1M
- $0.36
- Context
- 524K
- Max output
- 131K
- Intelligence
- 28.2
- Released
- Aug 2026
Pricing
Solar Pro 4 API pricing
Per-token rates, plus what common tasks actually cost.
| Input tokensPer 1M tokens | $0.09 |
|---|---|
| Output tokensPer 1M tokens | $0.36 |
| Cached input (read)Per 1M tokens | $0.02 |
| Cache writePer 1M tokens | Not available |
Chat message
2K in, 500 out
$0.36
per 1,000 requests
Coding task
30K in, 4K out
$4.14
per 1,000 requests
Long document summary
150K in, 2K out
$14.22
per 1,000 requests
Benchmarks
Solar Pro 4 benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
28.2
Coding index
52.7
Agentic index
Not available
Specs
Context window and capabilities
What it can read, what it can write, and which API features it supports.
- Context window
- 524K tokens
- Max output
- 131K tokens
- Input types
- Text
- Output types
- Text
- Reasoning effort
- Max, Extra high, High, Medium, Low, Minimal, None
- Release date
- August 10, 2026
- Tool calling
- Structured outputs
- JSON mode
- Reasoning
- Temperature
- Stop sequences
- Deterministic seed
- Verbosity control
Compare
Solar Pro 4 vs other models
See how Solar Pro 4 stacks up head to head on price, benchmarks, and features.
Solar Pro 4 vs MiMo-V2.6-Flash
Upstage vs Xiaomi
See comparison
Solar Pro 4 vs GPT-6 Luna
Upstage vs OpenAI
See comparison
Solar Pro 4 vs DeepSeek V4 Flash 0731
Upstage vs DeepSeek
See comparisonSolar Pro 4 vs DeepSeek V4 Flash 0423
Upstage vs DeepSeek
See comparisonSolar Pro 4 vs Hy3
Upstage vs Tencent
See comparisonSolar Pro 4 vs Muse Spark 1.3 Contributor
Upstage vs Meta
See comparisonAlternatives
Solar Pro 4 alternatives
Similar models worth considering, and where each one has the edge.
OpenAI
GPT-6 Luna
Xiaomi
MiMo-V2.6-Flash
DeepSeek
DeepSeek V4 Flash 0731
Want to learn about other models? Browse all models
FAQ
Frequently asked questions
How much does Solar Pro 4 cost?
Solar Pro 4 costs $0.09 per 1M input tokens and $0.36 per 1M output tokens through the API. A typical chat message costs about $0.36 per 1,000 messages.
What is the context window of Solar Pro 4?
Solar Pro 4 accepts up to 524K tokens of input and can write up to 131K tokens in a single response.
What is the best alternative to Solar Pro 4?
GPT-6 Luna from OpenAI is a strong alternative. It offers: higher intelligence score, larger 1.05m context, accepts file and image.
Can I use Solar Pro 4 alongside other models?
Yes. Shortcut Chat sends one prompt to Solar Pro 4 and any other models you pick at the same time, so you can compare answers side by side.
Try Solar Pro 4 next to every other model.
Use Solar Pro 4 alongside all the other models. Use one at a time, or multiple together. Get the best answer from every AI.