Solar Pro 4
by Upstage · upstage/solar-pro4 · #75 cheapest of 422 paid models
Prices updated Sep 19, 2026, 6:21 PM UTC · refreshed hourly
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...
Compare vs:Claude Sonnet 5Claude Opus 4.6Claude Haiku 4.5GPT-5.6 Sol
Pricing
Input
$0.09
per 1M tokens
Output
$0.36
per 1M tokens
Blended (3:1)
$0.158
3 input : 1 output
Cache read
$0.018
per 1M cached tokens
Cache write
—
per 1M tokens
Cache & batch economics
Effective prices for Solar Pro 4 with prompt caching.
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $0.158 | $0.00954 | — |
| 50% | $0.131 | $0.00594 | −38% |
| 90% | $0.109 | $0.00306 | −68% |
*Example: 100K sticky context + 2K new input + 1K output. Batch discount is an approximate 50% off list rates (available for OpenAI / Anthropic / Google — not flagged for this creator). Confirm on the vendor’s pricing page.
What a request costs
| Workload | Input tokens | Output tokens | Cost / request | Cost / 1K requests |
|---|---|---|---|---|
| Short chat message | 500 | 300 | $0.000153 | $0.153 |
| Document summary | 8,000 | 1,000 | $0.00108 | $1.08 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.00342 | $3.42 |
| Long-context analysis | 150,000 | 5,000 | $0.0153 | $15.30 |
Performance
Intelligence Index
28.2
AA composite quality
Coding Index
52.7
Math Index
—
Agentic Index
—
Output speed
67 tok/s
median
Time to first token
1.19s
median
Time to first answer
31.12s
after reasoning tokens
Artificial Analysis benchmarks
| Benchmark | Score |
|---|---|
| GPQA Diamond | 89.1% |
| Humanity's Last Exam | 29.2% |
| SciCode | 44.6% |
| AA-LCR (Long Context Reasoning) | 74.0% |
| Terminal-Bench 2.1 | 57.3% |
| τ³-Bench Banking | 23.3% |
Design Arena Elo
| Category | Elo |
|---|---|
| Website | 1,188 |
| Web apps | 1,121 |
| UI components | 1,165 |
| Data viz | 1,195 |
| 3D | 1,208 |
| Game dev | 1,195 |
| Code categories | 1,197 |
Specs
Context window
524K
tokens
Max output
131K
tokens
Input modalities
text
Tokenizer
Other