Solar Pro 3
Upstage · released Jan 27, 2026
- Type
- Proprietary
- Input
- $0.15
- Output
- $0.60
- Cached
- $0.015
List price · per 1M tokens · Upstage at 128K context · source ↗
Our take
Written Aug 3, 2026Solar Pro 3 is Upstage's hosted-only text model built for long documents, handling up to 128,000 tokens in a single request. It arrives with no published parameter count and no verified quality scores in our data, so its value rests on context length and direct provider integration rather than measured performance.
Pick this when you need a 128,000-token request limit for long-document work and prefer direct Upstage integration. Use it if you are comfortable with a proprietary, hosted-only model at a fixed per-token rate. Skip it if you need benchmark-verified quality, fast throughput, or any image, audio or video input.
The case for it
- Substantial context length for long documents, at 128,000 tokens per request.
- Two hosted offers available, including direct from Upstage for native integration.
The case against it
- No verified quality scores in our data — no Elo, MMLU or other benchmarks to judge performance.
- Slow throughput on the direct provider, at five tokens per second.
- Parameter count undisclosed, so there is no basis for comparison to models of known size.
How good is it?
We hold no score for this model.
We look for every model we track on every board we watch, and none of them has turned up Solar Pro 3 — so there is no intelligence, coding, agentic or writing score to show you, not a low one, none.
Or rent it from someone else
Why this differs from the header. The strip above quotes Upstage's own list price. This is the cheapest live offer at the widest standard context we hold, whoever is serving it — a reseller undercutting a lab is ordinary commerce, not an error.
- per 1M tokens
- $0.15 in / $0.60 out
- Context served
- 128K
- Throughput
- Not measured
| Provider | In / out per 1M tokens | Context | Throughput | Trains on prompts | Logs prompts | Zero retention |
|---|---|---|---|---|---|---|
| OpenRouter | $0.15 / $0.60 | 128K | not measured | Unknown | Unknown | Unknown |
| Upstage | $0.15 / $0.60 | 128K | 53 tok/s | No | Yesunknown period | Unknown |
Across the 2 listings we hold: 1 say they do not train on prompts, 0 say they do and 1 do not say. 0 appear in the zero-retention registry we check; the rest are unknown to us rather than confirmed either way.
What each host's API supports
From the parameter list each endpoint publishes. Streaming is omitted: nothing we hold reports it, for any model.
- ✓
- Supported
- ✗
- Not supported
- Not published
- host gave no parameter list
| Provider | Tool calling | JSON output | Strict schema |
|---|---|---|---|
| OpenRouter | ✓ | ✓ | ✓ |
| Upstage | ✓ | ✓ | ✓ |
Tool calling: 2 of 2 listings say yes. JSON output: 2 of 2 listings say yes. Strict schema: 2 of 2 listings say yes.
When we formed this view
Dates behind this page
Prices last checked 9d ago
What we do not know about this model yet
- No board we watch has turned up a score, so we hold no quality figures at all.
- Nothing we hold says whether an endpoint streams, so we do not show it either way.
- 1 of 2 listings do not say whether they train on prompts.
Licence and identifiers
What the licence allowsWe hold no licence record for this model. Inside are the identifiers you need to pull it — its Hugging Face repo where we have one, our slug and a machine-readable card.
Licence
Commercial API terms. We hold no licence record for this model, so there is nothing to summarise here.
Identifiers
- Modality record
- text->text
- Catalogue slug
- upstage-solar-pro-3