Solar Pro 3 — API Pricing & Benchmarks
Solar Pro 3 is Upstage's mid reasoning model, released in 2026-01. The API costs $0.15 per 1M input tokens and $0.60 per 1M output tokens ($0.26 blended at a 3:1 ratio), with cached input at $0.01. It supports a 128K-token context window. On the independently measured Artificial Analysis Intelligence Index it scores 14.5, ranking #62 of 68 models tracked on this site, with a median output speed of 142 tokens/sec.
Explore provider routes and additional benchmark sources for Solar Pro 3
| Provider | Upstage |
| Input price / 1M tokens | $0.15 |
| Output price / 1M tokens | $0.60 |
| Cached input / 1M tokens | $0.01 |
| Blended price (3:1) | $0.26 |
| Context window | 128K |
| Max output tokens | — |
| Knowledge cutoff | 2025-07 |
| License | proprietary |
| Input modalities | T |
| Output speed (tok/s) | 142 |
| Released | 2026-01 |
| Artificial Analysis Intelligence Index | 14.5 |
| GPQA Diamond | 72.4% |
| Humanity's Last Exam | 10.3% |
Where Solar Pro 3 fits
On a blended 3:1 basis Solar Pro 3 costs $0.26 per 1M tokens, cheaper than 89% of the 80 priced models in this index. It sits in the mid-tier bracket where most production chat, RAG and summarization workloads run: meaningfully cheaper than flagships while keeping most of their capability. Cached input is priced at $0.01 (90% below standard input), which rewards prompt structures with long stable prefixes — see our caching guide.
Price history
| Period | Input $/1M | Output $/1M | Cached $/1M |
|---|---|---|---|
| 2026-07-18 → current | $0.15 | $0.60 | $0.01 |
No list-price changes recorded since tracking began. Full dataset: price-history.json (CC BY 4.0).
Alternatives at a similar price
- GPT-4o mini (OpenAI) — $0.26/1M blended, AA Index 6.7
- Mistral Small 4 (Mistral AI) — $0.26/1M blended, AA Index 19.7
- Solar Pro 2 (Upstage) — $0.26/1M blended, AA Index 12.5
- GLM-5.3-Flash (Zhipu AI (Z.ai)) — $0.24/1M blended, AA Index 57.5
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.