Solar Pro 4 — API Pricing & Benchmarks
Solar Pro 4 is Upstage's flagship reasoning model, released in 2026-08. The API costs $0.30 per 1M input tokens and $1.20 per 1M output tokens ($0.52 blended at a 3:1 ratio), with cached input at $0.06. It supports a 524K-token context window. On the independently measured Artificial Analysis Intelligence Index it scores 41.6, ranking #39 of 68 models tracked on this site, with a median output speed of 62 tokens/sec.
Explore provider routes and additional benchmark sources for Solar Pro 4
| Provider | Upstage |
| Input price / 1M tokens | $0.30 |
| Output price / 1M tokens | $1.20 |
| Cached input / 1M tokens | $0.06 |
| Blended price (3:1) | $0.52 |
| Context window | 524K |
| Max output tokens | 131K |
| Knowledge cutoff | — |
| License | proprietary |
| Input modalities | T |
| Output speed (tok/s) | 62 |
| Released | 2026-08 |
| Artificial Analysis Intelligence Index | 41.6 |
| LMArena Elo | 1377 |
| GPQA Diamond | 89.1% |
| Humanity's Last Exam | 29.2% |
Where Solar Pro 4 fits
On a blended 3:1 basis Solar Pro 4 costs $0.52 per 1M tokens, cheaper than 79% of the 80 priced models in this index. As Upstage's flagship it is aimed at the hardest workloads — complex reasoning, agentic coding and multi-step tool use — where output quality dominates cost. Measured output speed of 62 tokens/sec is below the index median of 104 — typical of reasoning-heavy models, and worth checking against interactive latency budgets. Cached input is priced at $0.06 (80% below standard input), which rewards prompt structures with long stable prefixes — see our caching guide.
Price history
| Period | Input $/1M | Output $/1M | Cached $/1M |
|---|---|---|---|
| 2026-08-10 → current | $0.30 | $1.20 | $0.06 |
No list-price changes recorded since tracking began. Full dataset: price-history.json (CC BY 4.0).
Alternatives at a similar price
- MiniMax M3 (MiniMax) — $0.52/1M blended, AA Index 45.4
- MiniMax M2.7 (MiniMax) — $0.52/1M blended, AA Index 38.9
- Gemini 3.1 Flash-Lite (Google) — $0.56/1M blended, AA Index 25.6
- Qwen3.6-Flash (Alibaba Qwen) — $0.56/1M blended
About Upstage
Upstage, a Korean AI lab, builds the Solar Pro line with a focus on efficient models that deliver usable quality at some of the lowest prices in the index.