Upstage
Upstage Solar Pro 4
Upstage Solar Pro 4 is a Upstage model with 524K context, $0.30 in / $1.20 out per million tokens, last verified September 2, 2026. Open weights: no. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.
Solar Pro 4 is Upstage's closed flagship with a 524K context at a low launch price.
Catalog record checked September 2, 2026Individual provider fields may change
| Specification | Upstage Solar Pro 4 |
|---|---|
| Provider | Upstage |
| Tier | Frontier |
| Context window | 524K |
| Max output | Not verifiedUnverified |
| Input / 1M tokens | $0.30 |
| Output / 1M tokens | $1.20 |
| Weights | Closed |
| Parameters | Not disclosed |
| Reasoning levels | low, medium, high |
| Modalities | text |
| API model id | solar-pro-4 |
| Released | August 10, 2026 |
Pricing tiers: List $0.30/$1.20 per MTok; live promo rate is $0.03/$0.12 (90% off through 2026-09-10). Closed API. 524K context.
Verified evidence
Published benchmark results
Each result keeps its source and measurement date visible. A missing benchmark is not treated as a zero.
| Benchmark | Score | Measured | Source |
|---|---|---|---|
| Artificial Analysis Intelligence Index | 50 | 2026-08-14 | Artificial Analysis · View source |
Best for
- Long-context
- Cost-sensitive API
- Korean + English
Watch out
Source receipts
Catalog figures for this model were checked against the following sources.
- Upstage — Solar Pro 4 (accessed 2026-08-29)
- Upstage (accessed 2026-08-29)
Common questions
Upstage Solar Pro 4
Answered from the verified figures on this page rather than general guidance.
How much does Upstage Solar Pro 4 cost per million tokens?
Upstage Solar Pro 4 is listed at $0.30 per million input tokens and $1.20 per million output tokens at standard rates. Output tokens usually dominate real bills, so weigh the output rate more heavily than the input rate. List $0.30/$1.20 per MTok; live promo rate is $0.03/$0.12 (90% off through 2026-09-10). Closed API. 524K context.
What is Upstage Solar Pro 4's context window?
Upstage Solar Pro 4 accepts about 524K tokens of context. That only matters if you routinely send very long documents, large codebases, or multi-turn histories that approach that limit.
What is Upstage Solar Pro 4 best for?
Upstage Solar Pro 4 is a frontier tier from Upstage. It suits long-context, cost-sensitive api, korean + english. Closed API; promo pricing may end.