Solar Pro 4
Upstage · Proprietary · Released Aug 10, 2026 · upstage/solar-pro4
Best $0.09 in / $0.36 out via Upstage
524K contextToolsReasoningStructured outputPrompt caching
Available from 2 providersUSD / MTOK · PRICES 23 MINUTES AGO · SPEED 20 DAYS AGO
EST. MONTHLY COSTclick a row for detail · click headers to sort
| PROVIDER | INPUT | OUTPUT | CACHE | CONTEXT | QUANT | TTFT | TPS | UPTIME |
|---|---|---|---|---|---|---|---|---|
 Upstage1ST PARTY | $0.09 | $0.36 | $0.018 | 524K | — | 2.1s | 55 tok/s | 100.0% |
| Upstage1ST PARTY | $0.09 | $0.36 | $0.018 | 524K | — | — | — | 100.0% |
TTFT/TPS: median (P50) over trailing 504h · chat10k profile (~10K in / 200 out) · measured via OpenRouter routing · methodology v1.1 · measured 20 days ago
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Input price history · best listed price, observed
↑ 200% SINCE SEP 11, 2026
$0.03 · SEP 11, 2026$0.09 · TODAY
Pricing variants · USD / MTok in / out
STANDARD
$0.09 / $0.36
per MTok in / out
CACHE READ $0.018
Recent changesRSS ↗
Sep 11, 2026price increased · input0.03 → 0.09
Sep 11, 2026price increased · output0.12 → 0.36
About
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...
Specifications
Context window524,288
Max output131,072
Modalities intext
Modalities outtext
LicenseProprietary
ReleasedAug 10, 2026
TokenizerOther
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[](https://modelindex.ai/models/upstage/solar-pro4)Sources
OpenRouter API23 minutes ago
AGGREGATORModelIndex benchmarks20 days ago
MEASUREDVerified 23 minutes ago · list prices, not negotiated rates.