Upstage Solar Pro4
Official model page not yet on record
Listed price on OpenRouter ↗Ranked 26 of the tracked routed-model set.
What the evidence shows today.
The page leads with what has been observed, then separates price, capability and history so a buyer can see both the signal and its limits.
Routed share moved from 0.14% to 0.72% across 8 tracked weeks.
Per one million tokens. Cached input is listed at $0.018.
Reasoning, tool calling and structured output are supported.
Published price, translated into a workload.
Live per-token pricing via OpenRouter, verified 2 Oct 2026. Batch and long-context tiers are not published in the feed, so they are omitted rather than estimated.
No cached-input price is published for this model, so cached tokens are costed at the full input rate. The cached-input amount is therefore an upper-bound estimate, not an observed discount.
An estimate from published per-token pricing and your assumptions. Actual costs vary by provider and usage tier.
Same workload as the calculator above, at each model's current price. Monthly USD.
Every point is an observed week.
Routed-token share over time, with no interpolation presented as evidence. A price line joins it as real changes are recorded.
What it supports, and what remains undisclosed.
Verified support, explicit non-support and missing disclosure read differently on purpose. A blank is never made to look like a negative finding.
| Context window | 524K |
| Reasoning | ✓ Supported |
| Tool calling | ✓ Supported |
| Structured output | ✓ Supported |
| Image input | — Not supported |
| Audio input | — Not supported |
| Video input | — Not supported |
| Open weights | — Proprietary |
| API availability | ✓ Yes |
| Commercial license | Verify terms with the provider |
- Current rank
- #26
- Peak rank
- #14
- Routed share
- 0.72%
- Peak share
- 1.31%
- Weeks ranked
- 8
- First tracked
- 12 Aug 2026
- Region of origin
- Asia
- Provider
- Upstage
- Model family
- Not yet on record
- Release date
- Not yet on record
- Type
- Text
- Modalities
- text
- Context window
- 524K tokens
- Weights
- Proprietary
- License
- Not yet on record
Median provider uptime across OpenRouter endpoints, last 30 days. Latency and throughput are not published by the source and are not estimated here.
Observed first. Interpreted only when sourced.
In the week ending 1 Oct 2026, Upstage Solar Pro4 fell 10 places to #26 with 0.72% of routed tokens and a peak rank of #14. Over 8 tracked weeks its routed share has moved from 0.14% to 0.72% (+0.58 pp).
A sourced weekly interpretation of what is driving this model's routing is added as the record accumulates. yellow3 does not publish a reason for movement unless the routed-traffic data or a cited source supports it.
What changed around this model.
Dated developments concerning this model and its provider. Facts, evidence status and yellow3 analysis remain separate.
Measured observation
Upstage Solar Pro4 entered the routed top 20.
Rank moved from #22 to #17 as routed share reached 1.31% in the seven days ending 10 Sep 2026. The record does not assign a cause.
ConcernsModel · Upstage Solar Pro4Open signal Close signalAdoption moveRank#22#17Routed share0.85%1.31%Evidence statusMeasured observationBefore and after recordedAlso this week- Peak routed share 1.31%
Recorded in the same observed week as this signal, and part of the same movement rather than separate events.Source and datesOpenRouter routing rankingsOpen original source for OpenRouter routing rankings (opens in a new tab)Event datePublication dateNot disclosedLatest verificationWhy it mattersNo interpretation is published for this signal. The observation stands on its own.
Related contextEvidence boundaryFact, source and yellow3 interpretation remain separate. Sequence is not converted into causation.Corrections: none recordedMeasured observation
Upstage Solar Pro4 recorded its largest weekly rise.
Rank moved from #51 to #27 as routed share reached 0.62% in the seven days ending 20 Aug 2026. The record does not assign a cause.
ConcernsModel · Upstage Solar Pro4Open signal Close signalAdoption moveRank#51#27Routed share0.14%0.62%Evidence statusMeasured observationBefore and after recordedSource and datesOpenRouter routing rankingsOpen original source for OpenRouter routing rankings (opens in a new tab)Event datePublication dateNot disclosedLatest verificationWhy it mattersNo interpretation is published for this signal. The observation stands on its own.
Related contextEvidence boundaryFact, source and yellow3 interpretation remain separate. Sequence is not converted into causation.Corrections: none recorded
OpenRouter usage represents routed developer traffic, not the whole AI market. Timing near an adoption change does not establish causation. Sources checked for this record: OpenRouter routed-traffic rankings, OpenRouter listed price. Provider announcements and independent reporting are not yet monitored and are absent rather than nil.
The record behind the headline.
The current position stays connected to every observed week, price change and milestone.
| Week ending | Rank | Routed share | Δ share | Movement | Region rank | Status |
|---|---|---|---|---|---|---|
| 1 Oct 2026 | #26 | 0.72% | -0.54 | ▼ 10places down | #14 | ranked |
| 24 Sep 2026 | #16 | 1.26% | -0.01 | ▼ 2places down | #10 | ranked |
| 17 Sep 2026 | #14 | 1.27% | -0.03 | ▲ 3places up | #9 | ranked |
| 10 Sep 2026 | #17 | 1.31% | +0.46 | ▲ 5places up | #11 | ranked |
| 3 Sep 2026 | #22 | 0.85% | +0.33 | ▲ 3places up | #14 | ranked |
| 27 Aug 2026 | #25 | 0.52% | -0.10 | ▲ 2places up | #12 | ranked |
| 20 Aug 2026 | #27 | 0.62% | +0.48 | ▲ 24places up | #12 | ranked |
| 13 Aug 2026 | #51 | 0.14% | – | NEW | #16 | NEW |
| Date | Input / 1M | Output / 1M | Change | Source |
|---|---|---|---|---|
| 10 Sep 2026 | $0.090 | $0.36 | Not established | OpenRouter listed price |
| 18 Aug 2026 | $0.030 | $0.12 | — | OpenRouter listed price |
OpenRouter publishes one headline price per model, and that price follows whichever provider it is currently routing to. At the latest reading this model was offered by 2 providers, all at $0.090 per million input tokens. A move in the headline therefore does not establish that anyone changed a price. yellow3 records the providers charging the listed price with every observation and reports a change only where a provider charging the earlier price is charging the new one. Observations recorded before 23 September 2026 do not name the provider, so the prices are published and no change is derived from them. See the correction record.
- 12 Aug 2026First trackedDerived from yellow3 routed-traffic data
- 20 Aug 2026Biggest weekly rise +24 placesDerived from yellow3 routed-traffic data
- 10 Sep 2026Entered top 20Derived from yellow3 routed-traffic data
- 10 Sep 2026Peak routed share 1.31%Derived from yellow3 routed-traffic data
- 1 Oct 2026Biggest weekly fall -10 placesDerived from yellow3 routed-traffic data
Every claim keeps its route back to evidence.
Region reflects where the model's developer is headquartered. Figures are OpenRouter routing traffic, aggregated over a trailing seven days - developer routing behaviour, not the whole market.
Follow the model, not the launch cycle.
The public record shows today's evidence. yellow3 Model Intelligence adds longer history, watchlists, alerts, comparisons and decision reporting.