Solar Mini 4
Upstage · released Sep 23, 2026
- Type
- Closed
- Input
- $0.050
- Output
- $0.20
- Cached
- $0.005
List price · per 1M tokens · Upstage at 524K context · source ↗
Our take
Written Sep 30, 2026Solar Mini 4 is a text model we list no download for, so using it means choosing a host. Nothing here measures how good its answers are, and its two listed offers are priced identically, so the choice between them comes down to which company you would rather buy from.
Use it for straight text work where a low per-token rate matters and you are willing to judge the output yourself, or for long inputs that would otherwise have to be broken into pieces before sending. Both listed offers sit at the same rate, so pick the company you would rather buy from. Skip it if you need measured evidence of coding, reasoning or chat quality before committing, or if you need to run the model on your own machine.
The case for it
- Both listed offers sit at the same low rate, so a high-volume text workload stays inexpensive and neither host undercuts the other.
- The request capacity takes long documents whole, so you do not have to split them up first, though whether the model reliably uses material from the far end of a long input is unverified in our data.
The case against it
- No benchmark scores are supplied, so there is no evidence of coding, reasoning or chat quality to weigh against your own trial runs.
- The two offers are priced identically, so nothing in the figures separates them and the decision falls to which company you would rather buy from.
How good is it?
We hold no score for this model.
So there is no figure here for everyday use, coding, agent work or writing. That is a gap in our data, not a low score.
Where to rent it
Prices checked between 55 min and 58 min ago — each listing carries its own date.
Upstage, through OpenRouter
The lab is also the cheapest we hold. The strip above and this offer are the same one, so nothing on this page undercuts Upstage on 524K of context.
- per 1M tokens
- $0.050 in / $0.20 out
- Context served
- 524K
- Throughput
- ~89 tok/s
| Provider | In / out per 1M tokens | Context | Throughput | Trains on prompts | Logs prompts | Zero retention |
|---|---|---|---|---|---|---|
| OpenRouterOpenRouter's own listing | $0.050 / $0.20checked 58 min ago | 524K | not measured | Unknown | Unknown | Unknown |
| UpstageThrough OpenRouter | $0.050 / $0.20checked 55 min ago | 524K131K max reply | 89 tok/s | No | Yesunknown period | Confirmed |
OpenRouterAcross the 2 listings we hold: 1 says it does not train on prompts, 0 say they do and 1 does not say. 1 appears in the zero-retention registry we check; the rest are unknown to us.
What each host's API supports
From the parameter list each endpoint publishes. Streaming is omitted: nothing we hold reports it, for any model.
| Provider | Tool calling | JSON output | Strict schema |
|---|---|---|---|
| OpenRouterOpenRouter's own listing | ✓ | ✓ | ✓ |
| UpstageThrough OpenRouter | ✓ | ✓ | ✓ |
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
Recent changes
What moved
first indexed by our pipelineEach date is the day we first saw the change, or the day the maker announced it.
What we do not know about this model yet
- No independent board has scored it, 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 does not say whether it trains on prompts.
- We hold no batch or off-peak rate for any of its listings.
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
We hold no licence record for this model, and no record of published weights either — so we can neither summarise its terms nor point you at the weights.
Identifiers
- Takes in, gives back
- Text in, text out
- Catalogue slug
- upstage-solar-mini-4