Upstage's flagship model, specialized for agentic use
Solar Pro 4 by upstage is offered by 5 providers on this page. Its official list price is $0.30 per 1M input tokens and $1.20 per 1M output tokens. The lowest paid channel is NanoGPT at $0.03 / $0.12 per 1M, about 10× below the list price. That channel is a third-party gateway, so confirm its availability and rate limits before depending on it.
Artificial Analysis rates it 28.2 on the Intelligence Index, with 52.7 for coding. Against its lowest blended price of $0.052 per 1M, that is roughly 537 index points per dollar, which is the value ratio the leaderboards rank on. Median output speed is 109 tokens per second, with 1.92s to the first token.
The context window is 524,288 tokens, with an output limit of 131,072 tokens. It supports reasoning, tool use, and structured output. Providers report the capability flags inconsistently, so verify a specific feature against the host you plan to use. Its training knowledge cuts off at 2026-02.
Quality is independently evaluated by Artificial Analysis. Speed/latency are model-level medians.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| NanoGPT | Gateway | $0.03 | $0.12 | $0.006 | — | 524,288 | 131,072 | |
| LLMTR | Gateway | $0.03 | $0.12 | — | — | 524,288 | 131,072 | |
| OpenRouter | Gateway | $0.09 | $0.36 | $0.018 | — | 524,288 | 131,072 | |
| UpstageOfficial | First-party | $0.30 | $1.20 | $0.06 | — | 524,288 | 131,072 | |
| Kilo Gateway | Gateway | $0.30 | $1.20 | $0.06 | — | 524,288 | 131,072 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Individual evaluations run by Artificial Analysis, on the same reasoning tier as the intelligence score above. Each benchmark has its own task set and harness, so rows are not comparable with one another. The Intelligence Index above draws on a different, newer set of evaluations.